79 results on '"De los Santos-Posadas, Héctor M."'
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2. Non-destructive method for above-ground biomass estimation of Fraxinus uhdei (Wenz.) Lingelsh in an urban forest
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López-López, Stephanie F., Martínez-Trinidad, Tomás, Benavides-Meza, Héctor, Garcia-Nieto, Moises, and de los Santos-Posadas, Héctor M.
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- 2017
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3. Ecuaciones alometricas para estimar biomasa en especies de encino en Guanajuato, Mexico/Allometric equations to estimate biomass in oak species in Guanajuato, Mexico
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Cortés-Sánchez, Bossuet G., Ángeles-Pérez, Gregorio, De los Santos-Posadas, Héctor M., and Ramírez-Maldonado, Hugo
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Forest products industry - Abstract
Los bosques de encino son importantes en el equilibrio de los ecosistemas donde estos cohabitan, ya que son un grupo de especies con mayor capacidad para fijar y almacenar carbono atmosférico. El objetivo de este trabajo fue desarrollar ecuaciones alométricas para estimar biomasa aérea de seis especies de encino (Quercus rugosa, Q. obtusata, Q. sideroxyla, Q. coccolobifolia, Q. laurina y Q. candicans) con un muestreo destructivo de 165 árboles. Se ajustaron ecuaciones para estimar biomasa por componentes estructurales (fuste, ramas y follaje), y de forma aditiva se estimó la biomasa total, así como una ecuación generalizada para las seis especies, y ecuaciones para estas divididas en dos grupos. Para mejorar la capacidad predictiva de las ecuaciones se ajustaron modelos que incluyen las variables de diámetro normal, altura total y densidad de la madera. El mayor porcentaje de biomasa se concentró en el fuste con 60.6%, mientras que ramas y follaje representaron 36.1% y 3.28%, respectivamente. Las ecuaciones ajustadas explicaron más de 95% de la variabilidad en la biomasa total del árbol y, comparadas con ecuaciones desarrolladas en otros lugares para el mismo género, presentaron un menor sesgo porcentual. Las ecuaciones alométricas generadas pueden ser utilizadas para la región, así como en bosques con características estructurales y de crecimiento similares a las de las comunidades de encino de la sierra de Guanajuato. Oak forests are important from an environmental point of view, since they have a significant function as a carbon storage. This study is based on a destructive sampling of 165 oak trees with the objective of developing allometric equations to estimate aboveground biomass of six oak species (Quercus rugosa, Q. obtusata, Q. sideroxyla, Q. coccolobifolia, Q. laurina y Q. candicans). Allometric equations as additive system were generated to estimate biomass by structural components (stem, branches and foliage), the of additivity property guaranteed total biomass estimations as well as a generalized model. To improve the predictive capacity of the equations, models that include variables of diameter at breast height, total height and wood density were fitted. The highest percentage of biomass was concentrated in tree stem with 60.6%, while in the branches and foliage a concentration of 36.1 and 3.28%, respectively. The developed equations explained more than 95% of the total tree biomass, and compared with equations developed in other regions for the same genus, showed lower percentual bias. Such equations could be used for the region, as well as in forests with similar structural and growth features to those oak communities in forests from Santa Rosa and Guanajuato mountain ranges. Palabras clave: ajuste simultáneo ecuaciones específicas ecuaciones por grupo de especies regresión iterativa aparentemente no relacionada sesgo porcentual Keywords: simultaneous fitting specific equations equations by species group iterated seemingly unrelated regression percentage bias, INTRODUCCIÓN El importante rol de los ecosistemas forestales como reservorios de carbono ha generado una alta demanda en la estimación de biomasa y carbono contenidos en los árboles (Zhang, Co, [...]
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- 2019
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4. Maximum size-density relationship for mixed forests of Nuevo San Juan Parangaricutiro, Michoacán, Mexico.
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Hernández-Martínez, Abel J., Reyes-Hernández, Valentín J., de los Santos-Posadas, Héctor M., Velázquez-Martínez, Alejandro, and Quiñonez-Barraza, Gerónimo
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MIXED forests ,NUMBERS of species ,QUANTILE regression ,TEMPERATE forests ,PINE - Abstract
Copyright of Revista Chapingo Serie Ciencias Forestales is the property of Universidad Autonoma Chapingo and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2023
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5. A new zoning index for detecting areas of biological importance applied to a temperate forest in Central Mexico.
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Torres-Díaz, Alin Nadyely, de Jesús González-Guillén, Manuel, de los Santos Posadas, Héctor M., de la Rosa, Patricia Hernández, and Merino, Aurelio León
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Biodiversity conservation is a priority because it is the cornerstone of ecosystem services and natural cycles, providing essential resources for the development of humans and other species. Several indices have been proposed to prioritize areas needing protection. However, some require specific information while others are based on subjective categorical variables, are limited to a particular plant community or cannot be represented at a spatial scale. We developed an Index of Importance for Biological Conservation (InICoB), which was applied to a temperate forest in central Mexico but can be used for any plant community by adjusting some of its parameters. The proposed index is objective, based on quantitative indicators of vegetation composition and structure, and can be spatially projected. InICoB was tested and validated on a temperate cloud forest (CF) and its associated communities: advanced secondary vegetation (ASV) / coffee plantations (CP), agriculture, and induced grasslands. Life forms, presence of endemic, climax, native and protected species, diversity, structural complexity, and complementarity were used as indicators in its construction. InICoB was calculated for 63 sampling units (SUs), and a geostatistical model was incorporated for its interpolation with environmental and social variables as predictors. The results show that InICoB adequately evaluated the different environmental units that cover the locality. Significant differences were observed between the forest and the secondary/induced vegetation. The highest value of InICoB (0.91) was found in the CF, and the lowest in induced vegetation (0.3). The geostatistical model showed that occupation of the land, distance to town, and slope have an important influence on InICoB. The advantages of InICoB include the use of quantitative indicators that can be applied to any plant community. Additionally, it is flexible with respect to the data collected, it can be calculated only with the presence/absence of species or it can include forest measurement data. Furthermore, it is easy to interpret and can be spatially represented in a raster layer that can be added to a geographic information system. Therefore, it can be a very helpful tool in decision-making for land use planning and evaluation of the effects of human activities on plant communities. [ABSTRACT FROM AUTHOR]
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- 2023
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6. Crecimiento de Pinus patula var. longepedunculata Loock en plantaciones de la Sierra Sur de Oaxaca
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Pedro Cruz, Adrián, primary, Galán Larrea, Rolando, additional, De los Santos Posadas, Héctor M., additional, Valera Venegas, Gricelda, additional, Rivera Nava, Juana Laura, additional, and Sandoval García, Celestino, additional
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- 2022
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7. Forest Biometric Systems in Mexico: A Systematic Review of Available Models
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López-Martínez, Jorge Omar, primary, Vargas-Larreta, Benedicto, additional, González, Edgar J., additional, Corral-Rivas, José Javier, additional, Aguirre-Calderón, Oscar A., additional, Treviño-Garza, Eduardo J., additional, De los Santos-Posadas, Héctor M., additional, Martínez-Salvador, Martin, additional, Zamudio-Sánchez, Francisco J., additional, and Aguirre-Calderón, Cristóbal Gerardo, additional
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- 2022
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8. San Pedro El Alto Community Forest, Oaxaca, Mexico
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de los Santos-Posadas, Héctor M., primary, Valdez-Lazalde, J. René, additional, and Torres-Rojo, Juan Manuel, additional
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- 2015
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9. Contributors
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Andre, Mark S., primary, Andringa, Steve, additional, Ashton, Mark S., additional, Barkley, Jeff, additional, Barrett, Alex L., additional, Bentley, Greg, additional, Bettinger, Pete, additional, Bigelow, Bud, additional, Bocco, Gerardo, additional, Bodine, Jason, additional, Bollefer, Kevin, additional, Boston, Kevin, additional, Bretado-Velázquez, Javier L., additional, Brodie, Angus, additional, Brown, Cam, additional, Casey, Paul, additional, Cassian-Santos, Juan Manuel, additional, Chauvin, Cathy, additional, Cieszewski, Chris, additional, Corral-Rivas, J. Javier, additional, Cousins, Alex, additional, Covey, Kristofer, additional, Crowe, Kevin, additional, Cushing, Tamara L., additional, Danskin, Scott, additional, Davidson, Barry, additional, Davis, Adam, additional, Davis, Liane, additional, Davis, Brian, additional, de los Santos-Posadas, Héctor M., additional, Demirci, Mehmet, additional, Dippon, Duane, additional, Drew, Ian, additional, Duguid, Marlyse C., additional, Eng, Helge, additional, Ewing, Robert A., additional, Farrell, Peter, additional, Flint, Sean, additional, Foster, David, additional, Frost, Patrick, additional, Gómez, Felipe Aguilar, additional, Grebner, Donald L., additional, Grimm, Oliver, additional, Hairston-Strang, Anne, additional, Hawkins, Jim, additional, Held, Kirsten, additional, Ciro Hernández-Díaz, J., additional, Hoffman, Chris, additional, Hunter, William, additional, Izlar, Bob, additional, Johnson, Gary W., additional, Jolly, Kenneth, additional, Kallesser, Steven W., additional, Kelly, Scott, additional, Keron, Robert, additional, Klepacka, Anna M., additional, Knight, Dave, additional, Koehn, Steven, additional, Kollasch, Tom, additional, Koslowski, Jeremy, additional, Kumar, Venkatesh, additional, LaPointe, Thomas, additional, Livengood, Kerry, additional, Loera-Gallegos, Héctor M., additional, Lopez, Adolfo Chavez, additional, Mackasey, Pat, additional, Marshall, Gretchen, additional, Mattox, Norris, additional, Mavity, Erika, additional, McPherson, Heather, additional, McTague, John Paul, additional, Merry, Krista, additional, Monarrez-Gonzalez, Jose Carlos, additional, Montiel-Antuna, Eusebio, additional, Mueller, Scott, additional, Munn, Ian, additional, Nall, Robert, additional, Newton, Michael, additional, Nurullah, Abu, additional, O’Keefe, John, additional, O’Sullivan, Colleen, additional, Oppenheimer, Michael J., additional, Palmer, Aaron, additional, Perez-Verdin, Gustavo, additional, Petruncio, Markian, additional, Plotkin, Audrey Barker, additional, Porter, Dotty S., additional, Powers, Kip, additional, Rees, Dan, additional, Reimer, Don, additional, Richardson, Russ, additional, Rightmyer, Dick, additional, Ross, John, additional, Rouillard, Dan, additional, Rynearson, Gary, additional, Sánchez, Carlos Antonio López, additional, Savage, James, additional, Schwantes, Joseph, additional, Sessions, John, additional, Severt, Jane, additional, Shepard, Edward W., additional, Siry, Jacek P., additional, Smith, Kyle M., additional, Solin, Jeremy, additional, Soto, José Encarnación Luján, additional, Spyksma, Randy, additional, Stevens, Larry, additional, Stevens, Ron, additional, Straka, Thomas J., additional, Sullivan, Sarah, additional, Swae, Jon, additional, Torres, Alejandro, additional, Torres-Rojo, Juan Manuel, additional, Tran, Yenie, additional, René Valdez-Lazalde, J., additional, Van Damme, Laird, additional, Velázquez, Alejandro, additional, von Gadow, Klaus, additional, Willhoite, Robin G., additional, Williams, Del, additional, and Wright, William C., additional
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- 2015
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10. Inventario y cartografia de variables del bosque con datos derivados de LiDAR: comparacion de metodos
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Ortiz-Reyes, Alma Delia, Valdez-Lazalde, J. René, De los Santos-Posadas, Héctor M., Ángeles-Pérez, Gregorio, Paz-Pellat, Fernando, and Martínez-Trinidad, Tomás
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Forest products industry - Abstract
El método más común para estimar variables dasométricas a gran o pequeña escala es el inventario forestal basado en un muestreo en campo. En la actualidad la teledetección ofrece un abanico de posibilidades para incorporarse en las estimaciones forestales, tal es el caso de LiDAR (Light Detection And Ranging) que permite caracterizar de forma tridimensional el bosque. En este trabajo se estudió la relación entre datos derivados de LiDAR con los datos medidos en campo para estimar variables dasométricas como: área basal (AB), biomasa total (BT), cobertura arbórea (COB) y volumen de madera (VOL), mediante cuatro métodos: 1) regresión lineal múltiple, 2) regresión no lineal, 3) estimador de razón y 4) inventario forestal tradicional (muestreo estratificado). Las estimaciones totales derivadas del estimador de razón se encuentran dentro del intervalo de confianza al 95% calculado mediante inventario tradicional para AB, BT y VOL, siendo este el estimador que arroja los valores más cercanos y precisos a la estimación mediante inventario. En general, las estimaciones de los modelos no lineales fueron los más optimistas con respecto al inventario tradicional. Los resultados indican una buena relación ([R.sup.2] > 0.50) entre las métricas de LiDAR y datos de campo, principalmente los percentiles de altura y las tasas de retorno sobre una altura definida. A partir de los modelos lineales, se generó la cartografía de cada una de las variables analizadas. PALABRAS CLAVE: biomasa aérea, estimadores de razón y regresión, mapeo, modelación espacial, volumen total. The most common method to estimate forest variables to a large or small scale is the forest inventory based on field sampling. Currently, remote sensing techniques offer a range of possibilities in forest resources estimation; this is the case of LiDAR (Light Detection And Ranging) that allows the characterization forest structure in three-dimensions. We analyzed the relationship between LiDAR and field data to estimate forest variables such as: basal area (AB), total biomass (BT), crown cover (COB) and timber volume (VOL) through four methods: 1) multiple linear regression, 2) non-linear regression, 3) ratio estimators and 4) traditional forest inventory (stratified sampling). Total estimates derived from the ratio estimator were within the 95% confidence interval calculated by traditional inventory for AB, BT and VOL; this estimator showed the closest values and precision to those obtained by traditional forest inventory. In general, estimates through non-linear models were the most optimistic compared to the traditional forest inventory. Our results indicated a good relationship ([R.sup.2] > 0.50) between LiDAR metrics and field data, particularly the percentiles of height and rates of return on a defined height. From the linear models fit we generated maps for each of the forest variables analyzed. KEYWORDS: above-ground biomass, ratio and regression estimators, mapping, spatial modeling, total volume., Inventory and cartography of forest variables derived from LiDAR data: comparison of methods INTRODUCCIÓN La caracterización dasométrica de bosques y rodales para fines de manejo forestal se realiza tradicionalmente a [...]
- Published
- 2015
11. Establecimiento del gusano rojo en plantas de maguey en invernadero
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Llanderal-Cázares, Celina, De los Santos-Posadas, Héctor M., Almanza-Valenzuela, Iván, Nieto-Hernández, Ramón, and Castillejos Cruz, Carlos
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- 2010
12. DENSIDAD INICIAL EN EL RENDIMIENTO MADERABLE Y BIOMASA DE Pinus patula CON ESPECIES LATIFOLIADAS
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Ramírez-Martínez, Agustín, primary, De los Santos-Posadas, Héctor M., additional, Ángeles-Pérez, Gregorio, additional, González-Guillén, Manuel J., additional, and Santiago-García, Wenceslao, additional
- Published
- 2020
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- View/download PDF
13. ECUACIONES DINÁMICAS DE CRECIMIENTO EN ALTURA DOMINANTE E ÍNDICE DE SITIO PARA Pinus patula SCHIEDE ex SCHLTDL. & CHAM.
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Nava-Nava, Adan, primary, Santiago-García, Wenceslao, additional, Rodríguez-Ortiz, Gerardo, additional, De los Santos-Posadas, Héctor M., additional, Ruiz-Aquino, Faustino, additional, Santiago-García, Elías, additional, and Suárez-Mota, Mario E., additional
- Published
- 2020
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14. Modelos de biomasa aerea y foliar en una plantación de pino de rapido crecimiento en Oaxaca
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Rodriguez-Ortiz, Gerardo, De Los Santos-Posadas, Héctor M., González-Hernández, Víctor A., Aldrete, Arnulfo, Gómez-Guerrero, Armando, and Fierros-González, Aurelio M.
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Forest products industry - Abstract
El vigor de un árbol se puede evaluar a partir del follaje, que si bien representa de 4% a 6% de la biomasa total del árbol, es el componente principal para los procesos fisiológicos. El objetivo de este estudio fue estimar la biomasa de aciculas en ramas individuales y árbol completo, y ajustar modelos de partición de biomasa aérea en árboles plantados de Pinus patula Schl. et Cham. La biomasa de aciculas por rama se estimó con un modelo lineal, que empleó área basal de rama viva, altura de rama y el seccionamiento de copa como variables independientes. La biomasa de los componentes aéreos se estimó con coeficientes de determinación de 0,86; 0,92 y 0,88; para madera con corteza, ramas y aciculas, respectivamente. Para madera con corteza se utilizó el diámetro normal (DN) y altura de árbol (AT) en un modelo lineal; la biomasa de ramas y follaje con ecuaciones no lineales que se basaron en el diámetro de copa viva (DCV) y área de copa para ramas; y DCV y AT para la biomasa de follaje. La biomasa total aérea por árbol se estimó con un [R.sup.2] = 0,87; utilizando DN y AT. La biomasa a una edad de 14 años se distribuyó en 92,9%; 4,7% y 2,4% para madera, ramas y follaje, respectivamente. PALABRAS CLAVE: Diámetro basal de rama viva, diámetro de copa viva, Pinus patula, sección de copa. A forest tree health can be accurately assessed by evaluating foliage biomass; even when it represents only 4% to 6% of the total tree biomass, it is the main driver of every major physiological processes. This research was mainly focused on estimating accurately needle biomass at branch and tree level on fast growing trees of Pinus patula Schl. et Cham. Needle biomass per branch was estimated with a linear model, which used live branch basal area, live branch height, and crown section like independent variables. Above ground components were estimated with determination coefficients of 0,86, 0,92 and 0,88 for wood with bark, branches and needles. For the wood with bark model, diameter at breast height (DBH) and total tree height (HT) were used in a linear structure; total branch biomass was fitted with a non-linear model, using live crown diameter (LCD) and crown area (CA) while total needle biomass used LCD and HT on a non-linear model. The aboveground total biomass per tree was estimated with [R.sup.2] = 0.87, using DBH and HT. At 14 years old, biomass partition was estimated to be 92,9%, 4,7% and 2,4% for wood with bark, branches and needles, respectively. KEY WORDS: Basal live branch diameter, live crown diameter, Pinus patula, crown section., Above-ground and needle biomass models on a fast-growing pine plantation in Oaxaca INTRODUCCIÓN Ante el cambio climático global las plantaciones forestales de rápido crecimiento adquieren mayor importancia como reservorios de [...]
- Published
- 2012
15. Transectos de datos LiDAR: una estrategia de muestreo para estimar biomasa aérea en áreas forestales
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Ortiz-Reyes, Alma Delia, primary, Valdez-Lazalde, José René, additional, Ángeles-Pérez, Gregorio, additional, De los Santos-Posadas, Héctor M., additional, Schneider, Laura, additional, Aguirre-Salado, Carlos Arturo, additional, and Peduzzi, Alicia, additional
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- 2019
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16. Risk of infestations by Dendroctonus mexicanus Hopkins and Dendroctonus frontalis Zimmermann bark beetles in forests of Michoacán.
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Martínez-Rincón, Sigifredo, Valdez-Lazalde, José R., de los Santos-Posadas, Héctor M., and Sánchez-Martínez, Guillermo
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BARK beetles ,FOREST insects ,ANALYTIC hierarchy process ,CONIFEROUS forests ,FOREST density ,MEMBERSHIP functions (Fuzzy logic) ,MAPS - Abstract
Copyright of Revista Chapingo Serie Ciencias Forestales is the property of Universidad Autonoma Chapingo and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2022
- Full Text
- View/download PDF
17. Synergy of Landsat, climate and LiDAR data for aboveground biomass mapping in medium-stature tropical forests of the Yucatan Peninsula, Mexico.
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Ortiz-Reyes, Alma D., Valdez-Lazalde, José R., Ángeles-Pérez, Gregorio, De los Santos-Posadas, Héctor M., Schneider, Laura, Aguirre-Salado, Carlos A., and Peduzzi, Alicia
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TROPICAL forests ,FOREST biomass ,OPTICAL radar ,RANDOM forest algorithms ,LIDAR ,STANDARD deviations ,BIOMASS - Abstract
Copyright of Revista Chapingo Serie Ciencias Forestales is the property of Universidad Autonoma Chapingo and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2021
- Full Text
- View/download PDF
18. Integrating The Intra- And Inter-Species-Groups Competition Effects Into An Individual Diameter At Breast Height Growth Model For Mixed-Species Forests In Mexico
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Corral-Rivas, José Javier, Quiñonez-Barraza, Gerónimo, De los Santos-Posadas, Héctor M., and Zhao, Dehai
- Abstract
The forest management-planning in northwest of Durango, Mexico involve mixed-species stands and the selection method is normally applied for uneven-aged stands in such forests. An individual distance-dependent model without age was used to evaluated the diameter at breast height (dbh) growth and neighborhood effects for four species groups in mixed-species stands. The dataset considers 44 stem-mapped re-measurement plots and twenty-two species were grouped as: Pinus (seven species), other conifers (three species), other broadleaves (four species) and Quercus (eight species). Four methods were used to select neighboring trees, 12 distance-dependent competition indices were computed, and the con-group and hetero-group neighborhood effect were carried out for species groups. The dbh growth model was fitted separately under the assumptions of no-competition effect (without competition term), equivalent and nonequivalent neighborhood effects. The dbh growth models under the assumption of nonequivalent neighborhood effect outperformed the models under the assumptions of equivalent neighborhood effect and without competition effect. The intra-species-group competition negatively affect the diameter growth for all species groups, except for the Quercus group. In all cases, the fitted age-independent dbh growth models showed a good of fit to the stem-mapped plots data with adjusted coefficient of determination values larger than 0.97 and root mean square error values smaller than 1.33 cm. The growth models can be used to predict the dbh growth for the species groups in mixed-species forests.
- Published
- 2017
19. Height-diameter-age equation systems for Pinus arizonica Engelmann and Pinus durangensis Martinez in mixed-species stands in Durango, Mexico.
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Quiñonez-Barraza, Gerónimo, Dehai Zhao, and De los Santos-Posadas, Héctor M.
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STANDARD deviations ,LOTKA-Volterra equations ,PINE ,AKAIKE information criterion ,DUMMY variables ,FOREST surveys ,DIAMETER ,PINACEAE - Abstract
Copyright of Revista Chapingo Serie Ciencias Forestales is the property of Universidad Autonoma Chapingo and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2020
- Full Text
- View/download PDF
20. SISTEMA DE CRECIMIENTO Y RENDIMIENTO PARA EVALUAR SUMIDEROS DE CARBONO EN BOSQUES DE Pinus patula Schiede ex Schltdl. et Cham. BAJO APROVECHAMIENTO FOR.
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Palacios-Cruz, Dorian J., De los Santos-Posadas, Héctor M., Ángeles-Pérez, Gregorio, Fierros-González, Aurelio M., and Santiago-García, Wenceslao
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- *
COMPETITION (Biology) , *FOREST management , *FOREST biomass , *CARBON cycle , *GREENHOUSE gases , *PINACEAE - Abstract
Forests through forest-management are important carbon sinks (C) for the planet because they help mitigate climate change caused by greenhouse gases. Both forest type and management conditions will determine the amount of C captured. The objective of this study was to build a growth and yield system (SCR) to estimate the volume of Pinus patula and above-ground tree C stored in forests with forest management in Zacualtipán de Ángeles, Hidalgo, Mexico. Since volume shows a close relationship with biomass and C in a forest stand, it is possible to integrate these components within an SCR to model the dynamics of above-ground C sinks at the stand level. Data were obtained from 160 sites of 400 m2 systematically established in chronosequence of stand-ages within an intensive site monitoring of C. The system was composed of equations of dominant height, basal area, number of trees, volume, biomass and C for P. patula and broadleaf species. The site indices (IS) obtained were 15, 20, 25, 30 and 35 m at the base age of 40 years. Volume rotation occurs on average at 29 years of age, which indicates that the 40-year rotation used in the region can be shortened by applying intensive silvicultural work, such as heavy thinning to maintain a sawmill-oriented product distribution. The inclusion of the broadleaf species proportion component allowed to model the interspecific competition and the effect on the commercial species (pine). The SCR adequately modeled the behavior of biomass and C, estimated C at 89.1 Mg ha-1 for IS 30 at 35 years. This value is similar to those obtained in natural and managed forests in the region. [ABSTRACT FROM AUTHOR]
- Published
- 2020
21. An approximate height growth and site index model for Quercus sideroxyla Bonpl. in mixedspecies stands of Durango, Mexico.
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Quiñonez-Barraza, Gerónimo, Dehai Zhao, de los Santos-Posadas, Héctor M., and Corral-Rivas, José J.
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OAK ,STANDARD deviations ,ALGEBRAIC equations ,AKAIKE information criterion ,FOREST management - Abstract
Copyright of Revista Chapingo Serie Ciencias Forestales is the property of Universidad Autonoma Chapingo and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2020
- Full Text
- View/download PDF
22. FUNCIONES DE AHUSAMIENTO Y VOLUMEN COMERCIAL PARA Pinus patula Schltdl. et Cham. EN ZACUALTIPÁN, HIDALGO
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Hernández Pérez, Disraeli, primary, De los Santos Posadas, Héctor M., additional, Ángeles Pérez, Gregorio, additional, Valdez Lazalde, J. René, additional, and Volke Haller, Víctor Hugo, additional
- Published
- 2018
- Full Text
- View/download PDF
23. Considering neighborhood effects improves individual dbh growth models for natural mixed-species forests in Mexico
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Quiñonez-Barraza, Gerónimo, primary, Zhao, Dehai, additional, De Los Santos Posadas, Héctor M., additional, and Corral-Rivas, José J., additional
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- 2018
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24. SISTEMA DE CUBICACIÓN PARA ÁRBOLES INDIVIDUALES DE Tectona grandis L. f. MEDIANTE FUNCIONES COMPATIBLES DE AHUSAMIENTO-VOLUMEN
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Tamarit Urías, Juan Carlos, primary, De los Santos Posadas, Héctor M., additional, Aldrete, Arnulfo, additional, Valdez Lazalde, J. René, additional, Ramírez Maldonado, Hugo, additional, and Guerra De la Cruz, Vidal, additional
- Published
- 2018
- Full Text
- View/download PDF
25. Muestreo por conglomerados para manejo forestal en el Ejido Noh Bec, Quintana Roo
- Author
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Tadeo Noble, Alfredo E., primary, De Los Santos Posadas, Héctor M., primary, Ángeles Pérez, Gregorio, primary, and Torres Pérez, Jorge A., primary
- Published
- 2018
- Full Text
- View/download PDF
26. Descortezadores y sus enemigos naturales en Abies religiosa (Kunth) Schltdl. et Cham.
- Author
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Fonseca González, Alicia, primary, Burgos Solorio, Armando, additional, Fonseca González, Juana, additional, De los Santos Posadas, Héctor M., additional, and Juárez Muñoz, Juana, additional
- Published
- 2018
- Full Text
- View/download PDF
27. FUNCIONES COMPATIBLES DE AHUSAMIENTO Y VOLUMEN EN UNA PLANTACIÓN FORESTAL COMERCIAL DE Pinus chiapensis (Martínez) Andresen EN TLATLAUQUITEPEC, PUEBLA.
- Author
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Martínez-Angel, Luis, de los Santos-Posadas, Héctor M., Fierros-González, Aurelio M., Cruz-Cobos, Francisco, and Quiñonez-Barraza, Gerónimo
- Subjects
- *
STANDARD deviations , *TREE farms , *PARABOLOID , *FOREST management , *PINE , *SQUARE root - Abstract
Taper, or stem profile functions are practical mathematical tools for quantifying the volume and distribution of products of standing trees. These data are relevant in creating forest management programs for timber production. The objective of this study was to fit different models of total volume, segmented taper functions compatible with merchantable volume, models of total volume within the compatible segmented taper-volume function of Fang, and to analyze the different dendrometric types in the segmented function of Fang. All this to obtain the best volume system for Pinus chiapensis in a commercial forest plantation in Tlatlauquitepec, Puebla, Mexico. Data from 35 felled trees, 3, 5, 6 and 7 years old were evaluated and a total of 485 pairs of observations of diameters and heights along the stem were generated. To calculate stem volume, the overlapping bolts method was used. The segmented functions of Fang, Max and Burkhart showed better precision, evidenced by higher coefficients of determination and lower values in the mean square root of the error, coefficient of variation and average absolute bias. The segmented Fang function suggests two inflexion points. The first occurred at 5% and indicated a geometric change from neiloid to paraboloid, and the second occurred at 50% of the total height, indicating the geometric change from paraboloid to cone. The model of the combined fitted variable in the Fang system denotes a mean form factor of 0.39, closer to a cone than to a paraboloid. The statistical results indicated that the Fang compatible system combined with the Takata total volume model allow precise prediction of taper and of total and merchantable volume. [ABSTRACT FROM AUTHOR]
- Published
- 2019
28. Compatible taper, volume, green weight, biomass and carbon concentration system for Quercus sideroxyla Bonpl.
- Author
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Quiñonez-Barraza, Gerónimo, Dehai Zhao, de los Santos-Posadas, Héctor M., Santiago-García, Wenceslao, Tamarit-Urías, Juan C., and Nájera-Luna, Juan A.
- Subjects
FOREST management ,PLANT biomass ,OAK ,CARBON ,WOOD density - Abstract
Copyright of Revista Chapingo Serie Ciencias Forestales is the property of Universidad Autonoma Chapingo and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2019
- Full Text
- View/download PDF
29. Modelos de biomasa aérea y foliar en una plantación de pino de rápido crecimiento en Oaxaca
- Author
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Rodríguez-Ortiz, Gerardo, primary, De Los Santos-Posadas, Héctor M., additional, González-Hernández, Víctor A., additional, Aldrete, Arnulfo, additional, Gómez-Guerrero, Armando, additional, and Fierros-González, Aurelio M., additional
- Published
- 2016
- Full Text
- View/download PDF
30. Inventario y cartografía de variables del bosque con datos derivados de LiDAR: comparación de métodos
- Author
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Ortiz-Reyes, Alma Delia, primary, Valdez-Lazalde, J. René, additional, De los Santos-Posadas, Héctor M., additional, Ángeles-Pérez, Gregorio, additional, Paz-Pellat, Fernando, additional, and Martínez-Trinidad, Tomás, additional
- Published
- 2016
- Full Text
- View/download PDF
31. FUNCIONES DE AHUSAMIENTO PARA CLONES DE Eucalyptus urophylla ESTABLECIDOS EN PLANTACIONES COMERCIALES EN HUIMANGUILLO, TABASCO, MÉXICO.
- Author
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Hernández-Ramos, Jonathan, De los Santos-Posadas, Héctor M., Valdéz-Lazalde, José R., Tamarit-Urias, Juan C., Ángeles-Pérez, Gregorio, Hernández-Ramos, Adrián, and Peduzzi, Alicia
- Abstract
Taper functions allow modelling stem profile, estimating the dimensions of tree sections and the timber-yielding volume per type of products, and planning forest supply. The objective of this study was to develop a function that allows modelling the stem profile of Eucalyptus urophylla S. T. Blake clone trees established with commercial purposes in Huimanguillo, Tabasco, Mexico. With 2,133 pairs of data from 93 trees, ten taper models were fitted with the maximum likelihood method. The best model was selected according to the lowest values of the root mean square error (RMSE), the coefficient of variation, the bias and the highest adjusted coefficient of determination (R²aj.). The fifth-degree polynomial model was the best statistically to model the stem profile of E. urophylla clones, because it includes the relative proportion of the height in each section of the total height. Autocorrelation was corrected by including in the fiiting a CAR(1) type autocorrelation structure. The polynomial model estimates in a reliable way the diameter and the height in clone trees from commercial plantations of E. urophylla. [ABSTRACT FROM AUTHOR]
- Published
- 2018
32. SiBiFor: Forest Biometric System for forest management in Mexico.
- Author
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Vargas-Larreta, Benedicto, Corral-Rivas, José J., Aguirre-Calderón, Oscar A., López-Martínez, Jorge O., De los Santos-Posadas, Héctor M., Zamudio-Sánchez, Francisco J., Treviño-Garza, Eduardo J., Martínez-Salvador, Martín, and Aguirre-Calderón, Cristóbal G.
- Subjects
STATISTICAL methods in ecology ,STATISTICAL methods in forest management ,FOREST management - Abstract
Copyright of Revista Chapingo Serie Ciencias Forestales is the property of Universidad Autonoma Chapingo and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2017
- Full Text
- View/download PDF
33. ESTIMACIÓN DEL VOLUMEN COMERCIAL EN PLANTACIONES DE Eucalyptus urophylla CON MODELOS DE VOLUMEN TOTAL Y DE RAZÓN.
- Author
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Hernández-Ramos, Jonathan, De los Santos-Posadas, Héctor M., Valdéz-Lazalde, José R., Tamarit-Urias, Juan C., Angeles-Pérez, Gregorio, Hernández-Ramos, Adrián, Méndez-Lopez, Benjamin, and Peduzzi, Alicia
- Abstract
The functional relationships between diameter at breast height (dn) and height (A) with the total volume (Vt) of a tree is essential for the technical management and exploitation of commercial forest plantations (PFC), along with the rate of different commercial heights (At ) or minimum diameters (di) along the bole with the merchantable volume (Vc). Based on the hypothesis that with such mathematically-expressed relationships it is possible to accurately estimate Vt and Vc, the objective was to propose a tool to quantify the Vt and Vc in Eucalyptus urophylla PFCs from seed and clones in southeastern Mexico, by means of volume-ratio functions (r). Six Vt models --fitted and corrected for heteroscedasticity taking variance into consideration-- and ten ratio models --correcting autocorrelation with an autoregressive structure-- were evaluated using dasometric information from 175 clone trees measured in 2007 (P1), 93 in 2014 (P2), and 459 in 2007 (P3); the third group was grown from seeds. The Schumacher-Hall model --which includes dichotomous variables-- showed that populations are statistically different. The best Vt models were: Schumacher-Hall for P1 and P3, and Spurr for P2. The best r models --which consider the diameter at different heights-- were: Burkhart for P1 and P2, and Cao for P3. When bole height models are used, Zepeda's was the most appropriate for the three populations. With these Vt and r models, each population's Vc was determined at any given di or Ai, which accounted for more than 94 % of the variability. The slenderness ratio was 114, 122, and 118 cm cm-1 and the form factor was 0.45, 0.34, and 0.34 for P1, P2 and P3, respectively. [ABSTRACT FROM AUTHOR]
- Published
- 2017
34. PROYECCIÓN EXPLÍCITA E IMPLÍCITA DEL RENDIMIENTO MADERABLE DE PLANTACIONES FORESTALES COMERCIALES DE Pinus patula Schiede ex Schltdl. et Cham.
- Author
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Parra-Piedra, José P., De los Santos-Posadas, Héctor M., Fierros-González, Aurelio M., Valdez-Lazalde, José R., and Romo-Lozano, José L.
- Subjects
- *
TIMBER , *FOREST products , *TREE farms , *FOREST products industry , *FOREST management , *WEIBULL distribution - Abstract
In Zacualpan, Veracruz, Mexico, there are 3,500 ha of commercial forest plantations of Pinus patula, but until now no evaluations of growth have been made that would allow an adequate programming of harvest. The objective of the present study was to evaluate growth and yield of timber, using an explicit and an implicit system with diametric distribution, both constructed with data of permanent forestry measurement plots. The hypothesis proposes that permanent observation plots, of different ages re-measured over time, will make it possible to obtain an explicit and implicit projected system of timber growth and yield. The first system is comprised of the polymorphic Schumacher-Korf type nonlinear model in dominant height, of compatible equations of prediction-projection for basal area, total volume and mortality. The explicit system utilizes the Weibull probability distribution function of three parameters. For this study 50 sites of 400 m2 were randomly selected, distributed in age classes of three to 21 years, which were established in 2011 and were re-measured in 2012 and 2015. Results showed four site indices (SI): 10, 15, 20 and 25 m at the base age of 15 years. The technical rotation in volume for the average condition (SI of 20 m) was at 14 years, age at which 251 m3 ha-1 are produced as expected total volume and a mean yield of 17.9 m3 ha-1 year-1. The diametric distribution projected a total volume of 242 m3 ha-1 at the age of technical rotation, and also made it possible to know that the proportion of trees with normal diameter >30 cm is presented prior to 10 years in rich sites and afterwards is incremented exponentially. [ABSTRACT FROM AUTHOR]
- Published
- 2017
35. PUPACIÓN, EMERGENCIA DE ADULTOS Y OVIPOSICIÓN DE Comadia redtenbacheri (LEPIDOPTERA: COSSIDAE) EN VIVERO.
- Author
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Delgado-Tejeda, Isis, Llanderal-Cázares, Celina, Miranda-Perkins, Kalina, and De los Santos-Posadas, Héctor M.
- Subjects
LEPIDOPTERA ,INSECT rearing ,PUPAE ,INSECT development ,INSECT larvae ,INSECT populations - Abstract
Copyright of Agrociencia is the property of Colegio de Postgraduados and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2017
36. PRODUCTIVIDAD PRIMARIA NETA AÉREA EN PLANTACIONES COMERCIALES DE Eucalyptus urophylla S. T. Blake EN HUIMANGUILLO, TABASCO, MÉXICO.
- Author
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Hernández-Ramos, Adrián, Valdez-Lazalde, José R., Ángeles-Pérez, Gregorio, de los Santos-Posadas, Héctor M., Hernández-Ramos, Jonathan, Peduzzi, Alicia, and Carrero, Omar
- Abstract
Copyright of Agrociencia is the property of Colegio de Postgraduados and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2017
37. CRECIMIENTO Y RENDIMIENTO MADERABLE EN PLANTACIONES DE Pinus chiapensis (Martínez) Andresen.
- Author
-
Fierros-Mateo, Reynol, De los Santos-Posadas, Héctor M., Fierros-González, Manuel A., and Cruz-Cobos, Francisco
- Abstract
A Timber Growth and Yield System (TGYS) is a set of models that quantitatively describe the growth and yield of forest stands over time. The aim of this study is to build a TGYS as a support tool for decision-making in the management of Pinus chiapensis (Martínez) Andresen. Data were collected from 44 plots established in 2013 at Tlatlauquitepec, Puebla, Mexico, and measured again in 2014. The components of the system were generated by the algebraic difference approach. The fitting was done with the seemingly unrelated regression technique (SUR) as a system of simultaneous equations. For the dominant height, Hossfeld IV polymorphic model was the most appropriate. Models for the basal area, number of trees and volume explained between 80.9 % and 99.9 % of the total variation. The yield table indicates that in low productivity sites (site index of 10 m), the maximum current annual increment (CAI) in volume occurs at 14 years, with a potential volume of 25.18 m3 ha-1 and an average yield of 196.84 m3 ha-1. In sites of mean index (14 m), the maximum CAI in volume takes place at 11 years, which has a potential volume of 32.73 m3 ha-1 and an average yield of 199.21 m3 ha-1. In high productivity areas (18 m), maximum CAI takes place at 9 years, with a potential volume of 40.66 m3 ha-1 and yield of 200.97 m3 ha-1. The estimated volume rotation at these sites occurs at 17 years, with a yield of 472.39 m3 ha-1. On average sites, the absolute volume rotation occurs at 20 years with yields of 453.54 m3 ha-1. At low productivity sites, this rotation is close to 25 years with a yield of 441.64 m3 ha-1. [ABSTRACT FROM AUTHOR]
- Published
- 2017
38. Aptitud ecoturística en la sierra nevada de Texcoco, Estado de México
- Author
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Pérez-Vivar, Marcelino A., primary, González-Guillén, Manuel de J., additional, Valdez-Lazalde, J. René, additional, De los Santos-Posadas, Héctor M., additional, and Ángeles-Pérez, Gregorio, additional
- Published
- 2014
- Full Text
- View/download PDF
39. SISTEMA COMPATIBLE DE CRECIMIENTO Y RENDIMIENTO PARA RODALES COETÁNEOS DE Pinus patula
- Author
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Santiago-García, Wenceslao, primary, De los Santos-Posadas, Héctor M., additional, Ángeles-Pérez, Gregorio, additional, Valdez-Lazalde, José René, additional, and Ramírez-Valverde, Gustavo, additional
- Published
- 2013
- Full Text
- View/download PDF
40. VARIACIÓN DEL FACTOR DE FORMA Y EL AHUSAMIENTO EN PROCEDENCIAS DE CEDRO ROJO (Cedrela odorata L.).
- Author
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Tlaxcala-Méndez, Rolando M., de los Santos-Posadas, Héctor M., Hernández-de la Rosa, Patricia, and López-Ayala, José L.
- Subjects
- *
TREE physiology , *TREE growth , *PLANT stems , *REGRESSION analysis , *QUANTITATIVE research , *GERMPLASM , *PHENOTYPES - Abstract
Knowledge of tree stem geometry is relevant for progeny studies aiming to obtain germplasm since the best individuals should have adequate growth and the best characteristics of stem formation. Thus, it is necessary to evaluate stem form with analytical methods. The objective of this study was to identify the progeny with the highest milling yield, considering form factor, taper variation and commercial volume of seven provenances of Cedrela odorata L. established in Tezonapa, Veracruz, Mexico. To this end, destructive sampling of 211 trees was carried out. Two linear regression and two non-linear regression models were fit and complemented with tests of additionality in the parameters form and taper. The results showed that the form parameters of the progenies from Tuxtepec, Tierra Blanca and Tezonapa adopted a paraboloid shape, and those from María Lombardo, San Andrés Tuxtla, Costa del Golfo and Comala tended to be conical. All the progenies were statistically different in taper parameters, which is attributed to the interaction genotype-environment and to infestation by the borer Hypsipyla grandella Zeller. Moreover, form parameters were evaluated in three compatible form and taper systems fitted with SUR (Seemingly Unrelated Regressions) estimation. The geographical source of Tuxtepec was less conical because the stems were geometrically closer to a paraboloid (form factor, ff 0.45). Therefore, Tuxtepec could be the main line of germplasm collection for local production. [ABSTRACT FROM AUTHOR]
- Published
- 2016
41. EFECTO DEL AG4/7 Y DEL ANILLADO EN EL TRONCO SOBRE EL CRECIMIENTO DEL BROTE EN Pseudotsuga menziesii (Mirb.) Franco
- Author
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Muñoz-Gutiérrez, Liliana, primary, Vargas-Hernández, J. Jésus, additional, De los Santos Posadas, Héctor M., additional, and López-Upton, Javier, additional
- Published
- 2012
- Full Text
- View/download PDF
42. MODELOS PARA ESTIMAR CRECIMIENTO Y EFICIENCIA DE CRECIMIENTO EN PLANTACIONES DE Pinus patula EN RESPUESTA AL ACLAREO
- Author
-
Rodríguez-Ortiz, Gerardo, primary, González-Hernández, Víctor A., additional, Aldrete, Arnulfo, additional, De los Santos-Posadas, Héctor M., additional, Gómez-Guerrero, Armando, additional, and Fierros-González, Aurelio M., additional
- Published
- 2011
- Full Text
- View/download PDF
43. MODELOS DE CRECIMIENTO EN ALTURA DOMINANTE PARA Eucalyptus grandis Hill ex Maiden y E. urophylla S. T. Blake EN OAXACA, MÉXICO
- Author
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Gómez-Tejero, Joaquín, primary, De los Santos-Posadas, Héctor M., additional, Fierros-González, Aurelio M., additional, and Valdez-Lazalde, J. René, additional
- Published
- 2009
- Full Text
- View/download PDF
44. SITE INDEX WITH COMPLEX POLYMORPHISM OF FOREST STANDS IN DURANGO, MÉXICO.
- Author
-
Quiñonez-Barraza, Gerónimo, De los Santos-Posadas, Héctor M., Cruz-Cobos, Francisco, Velázquez-Martínez, Alejandro, Ángeles-Pérez, Gregorio, and Ramírez-Valverde, Gustavo
- Subjects
- *
FOREST site quality , *SITE index (Forestry) , *TREE growth , *FOREST measurement , *ASYMPTOTES , *GENETIC polymorphisms , *MATHEMATICAL models - Abstract
Modeling of dominant height growth and site index is a valuable tool for classifying productivity of forest lands and for defining forest management strategies; station quality is a criterion for defining the programming of forest interventions. The derivation of a dynamic equation is presented from the base model of Chapman-Richards, considering the parameter of the asymptote and of the exchange rate as a function of site quality. The dynamic equation obtained has complex polymorphism and multiple asymptotes, and was fitted for Pinus arizonica, P. durangensis, P. teocote, P. leiophylla and P. ayacahuite as a group and by species with dummy variables, and was compared with two GADA equations, with the same number of parameters. These are based on the models of Chapman Richards and Korf, which have been used in the modeling of dominant height and site index. The comparison indicated that the derived equation presented better parsimony in the algebraic expression that describes the productivity of the site and considered the variability of the potential of the site as a function of the asymptote. The dynamic equation can be used to predict dominant height growth and site index for the mixed stands of the study area, with similar growth rates for Pinus durangensis, P. ayacahuite and P. arizonica, that responds to the degree of association among these species; Pinus teocote and P. leiophylla present the lowest growth rates. [ABSTRACT FROM AUTHOR]
- Published
- 2015
45. ÍNDICE DE SITIO CON POLIMORFISMO COMPLEJO PARA MASAS FORESTALES DE DURANGO, MÉXICO.
- Author
-
Quiñonez-Barraza, Gerónimo, De los Santos-Posadas, Héctor M., Cruz-Cobos, Francisco, Velázquez-Martínez, Alejandro, Ángeles-Pérez, Gregorio, and Ramírez-Valverde, Gustavo
- Abstract
La modelación del crecimiento de la altura dominante y el índice de sitio constituye una herramienta valiosa para clasificar la productividad de los terrenos forestales y definir estrategias de manejo forestal; la calidad de estación es un criterio para definir la programación de las intervenciones silvícolas. La derivación de una ecuación dinámica se presenta a partir del modelo base de Chapman-Richards, considerando el parámetro de la asíntota y el de la tasa de cambio como una función de la calidad de estación. La ecuación dinámica obtenida tiene polimorfismo complejo y múltiples asíntotas y fue ajustada para Pinus arizonica, P. durangensis, P. teocote, P. leiophylla y P. ayacahuite juntos y por especie con variables indicadoras, y se comparó con dos ecuaciones GADA, con el mismo número de parámetros. Éstas están basadas en los modelos de Chapman Richards y Korf, los cuales han sido empleados en la modelación de altura dominante e índice de sitio. La comparación indicó que la ecuación derivada presentó mejor parsimonia en la expresión algebraica que describe la productividad del sitio y consideró la variabilidad de la potencialidad del sitio como una función de la asíntota. La ecuación dinámica puede usarse para predecir el crecimiento en altura dominante e índice de sitio para las masas mezcladas del área de estudio, con tasas de crecimiento similares para Pinus durangensis, P. ayacahuite y P. arizonica, lo cual responde al grado de asociación entre estas especies; Pinus teocote y P. leiophylla presentan las tasas menores de crecimiento. [ABSTRACT FROM AUTHOR]
- Published
- 2015
46. INVENTARIO Y MAPEO DEL BOSQUE TEMPLADO DE HIDALGO, MÉXICO MEDIANTE DATOS DEL SATÉLITE SPOT Y DE CAMPO.
- Author
-
Muñoz-Ruiz, Miguel Á., Valdez-Lazalde, José R., de los Santos-Posadas, Héctor M., Ángeles-Pérez, Gregorio, and Monterroso-Rivas, Alejandro I.
- Subjects
TEMPERATE climate ,FORESTS & forestry ,FIELD crops ,DATA analysis ,REMOTE sensing - Abstract
Copyright of Agrociencia is the property of Colegio de Postgraduados and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2014
47. COMPATIBLE TAPER AND MERCHANTABLE VOLUME SYSTEM FOR MAJOR PINE SPECIES IN DURANGO, MEXICO.
- Author
-
Quiñonez-Barraza, Gerónimo, De los Santos-Posadas, Héctor M., Álvarez-González, Juan G., and Velázquez-Martínez, Alejandro
- Subjects
- *
ESTIMATION theory , *PLANT species , *DENDROMETERS , *PARABOLOID , *PINE - Abstract
The estimate of the merchantable and total volume is an essential tool in the forest planning and management, so the aim of this study was to evaluate three segmented systems of taper and merchantable volume with bark fitted as simultaneous equations for data from commercial forest species of Durango, Mexico. Fittings were made from three perspectives: 1) for each species in the three systems, 2) global fittings combining all species (reduced model) and 3) overall fit considering dummy variables (full model). Fitness of compatible systems of taper and merchantable volume suggest that studied species present two inflection points; the dendrometric shape from neiloide to paraboloidal, on average for the species studied, happens at 5 % of the total height, whereas the change from paraboloid to cone occurs at 73 %. System 3 (S3) has better qualities of fit between the analyzed systems and the full model with indicator variables with additive effects on Pinus durangensis Martinez was better than the reduced model. With the full model, Pinus ayacahuite Ehrenb presents the less cylindrical stem; Pinus arizonica Engelmannii presents the more cylindrical boles, whereas P. durangensis Martinez, Pinus leiophylla Schlecht et Cham and Pinus teocote Schlecht et Cham have a similar paraboloidal shape. The full model makes efficient the fit of the compatible system, all data in the fit process are used and standard errors of the parameters are reduced. [ABSTRACT FROM AUTHOR]
- Published
- 2014
48. SISTEMA COMPATIBLE DE AHUSAMIENTO Y VOLUMEN COMERCIAL PARA LAS PRINCIPALES ESPECIES DE Pinus EN DURANGO, MÉXICO.
- Author
-
Quiñonez-Barraza, Gerónimo, De los Santos-Posadas, Héctor M., Álvarez-González, Juan G., and Velázquez-Martínez, Alejandro
- Abstract
La estimación del volumen total y comercial es una herramienta básica en la planeación y manejo forestal, por lo cual el objetivo de este estudio fue evaluar tres sistemas segmentados de ahusamiento y volumen comercial con corteza, ajustados como ecuaciones simultáneas para datos de especies forestales comerciales de Durango, México. Los ajustes se realizaron desde tres perspectivas: 1) para cada especie en los tres sistemas, 2) ajustes globales combinando todas las especies (modelo reducido) y, 3) ajuste global considerando variables indicadoras (modelo completo). El ajuste de los sistemas compatibles de ahusamiento y volumen comercial sugieren que las especies estudiadas presentan dos puntos de inflexión; la forma dendrométrica de neiloide a paraboloide, en promedio para las especies estudiadas, sucede a 5 % de la altura total, mientras que el cambio de paraboloide a cono ocurre a 73 %. El sistema 3 (S3) posee mejores cualidades de ajuste entre los sistemas analizados, y el modelo completo con variables indicadoras con efectos aditivos a Pinus durangensis Martínez resultó mejor que el modelo reducido. Con el modelo completo Pinus ayacahuite Ehrenb presenta los fustes menos cilíndricos; Pinus arizonica Engelmannii presenta los fustes más cilíndricos, mientras que P. durangensis Martínez, Pinus leiophylla Schlecht Cham y Pinus teocote Schlecht et Cham tienen una forma paraboloide similar. El modelo completo hace eficiente el ajuste del sistema compatible, todos los datos se utilizan en el proceso de ajuste y los errores estándar de los parámetros disminuyen. [ABSTRACT FROM AUTHOR]
- Published
- 2014
49. ECUACIONES DINÁMICAS DE ÍNDICE DE SITIO PARA Tectona grandis EN CAMPECHE, MÉXICO.
- Author
-
Tamarit-Urias, Juan C., De los Santos-Posadas, Héctor M., Aldrete, Arnulfo, Valdez-Lazalde, José R., Ramírez-Maldonado, Hugo, and Guerra-De la Cruz, Vidal
- Subjects
- *
SITE index (Forestry) , *SILVICULTURAL systems , *FOREST site preparation , *TEAK - Abstract
A dominant height growth model and corresponding site index expression, allows estimating the productivity of forests stands and helps define the silvicultural management regime. The aim of this study was to develop, using data from permanent plots, a base-age invariant growth model for dominant height for Tectona grandis L. f. (teak) plantations at Campeche, Mexico. The base growth models used were those of Korf, Chapman-Richards and Hossfeld IV, which were reformulated as generalized algebraic difference equations to define the best site index structures. They were fitted under least squares with a data structure of non-overlapping pairs. To estimate the dominant height growth and classify plantation productivity, the dynamic equation type Chapman-Richards was selected based on the goodness of fit and similarity between the pattern of growth curves and observed trends. To improve the accuracy of the estimates this equation was fitted as a mixed effects model, correcting for heteroscedasticity and autocorrelation. The selected model is flexible and describes a pattern of polymorphic curves with multiple asymptotes, desirable characteristic to model a wide variety of growth patterns. Three specific growth patterns for the analyzed planting sites were detected. [ABSTRACT FROM AUTHOR]
- Published
- 2014
50. PREDICCIÓN DEL RENDIMIENTO MADERABLE DE Pinus patula Schl. et Cham. A TRAVÉS DE MODELOS DE DISTRIBUCIÓN DIAMÉTRICA.
- Author
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Santiago-García, Wenceslao, De los Santos-Posadas, Héctor M., Ángeles-Pérez, Gregorio, Corral-Rivas, José J., Valdez-Lazalde, José R., and Del Valle-Paniagua, David H.
- Subjects
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PINUS patula , *TIMBER , *PHYSICAL distribution of goods , *FORESTS & forestry , *SUSTAINABILITY - Abstract
The region of Zacualtipán, Hidalgo, Mexico, is characterized by the presence of even-aged stands of Pinus patula Schl. et Cham., a fast-growing timber species with high economic and ecological value. Having forestry tools to predict its growth and yield is a fundamental requisite to plan its sustainable management. The objective of this study was to present two prediction systems for timber yield of P. patula stands with the diameter distribution models approach. In their construction, dasometric data from 126 diameter distributions were used, which were obtained from 42 permanent sampling plots of 400 m², located in the Ejido La Mojonera, municipality of Zacualtipán, Hidalgo. Stand diameter distribution was estimated through Weibull's probability density function (pdf) (1951) with percentile prediction and the free distribution method based on percentiles. The means comparison with Tukey test (p≤0.05), for total volume predictions obtained with the two diameter distribution systems, shows that there are no significant statistical differences between the total volume predicted by both systems. However, the system based on Weibull's probability density function is easier to use because its parameters are dependent on the stand's minimum diameter and quadratic mean diameter, and it requires the prediction of only two percentiles. The diameter distribution models presented allow estimating the diameter structure of a stand as it changes with stand age. Therefore, their use is recommended as a support tool for management plans of P. patula stands. [ABSTRACT FROM AUTHOR]
- Published
- 2014
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