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This research was carried out on 115 Ross 208 female broilers. Data on live weights were collected from 91 broilers during 7 weeks of fattening which was the basis for modelling the growth curve using asymmetric S-function. The same function was used for modelling growth of Ross 208 female broilers on the basis of data obtained from technological procedure. The parameters of the model was established as well as the stages of growth and inflection point. By the model, 99.924 percent and 99.954 percent of variance was explained for live weights of female broilers from experiment and from technological procedure, respectively. This means that asymmetric S-function can be used as the model for description of broilers’ growth. Using this function it was possible to predict the future weights of boilers. It is also possible to predict the time in which broilers reach certain live weight. The birds from experiment would cease useful growth at weeks. Other 24 Ross 208 female broilers were slaughtered when they reached determined weights from 2200 to 3400 g in the period from 7th to 12th week. The data obtained by dissection of those broilers on the main parts (breast, thighs with drumstick, wings and back) were used for the analysis of relative growth by allometric equation. Growth rates (b) for the most valuable parts and abdominal fat were: breast - 1.158; thighs with drumstick - 0.869; wings - 0.725; back - 1.063 and fat - 1.519. Allometric coefficients indicate that only fat production was intensive in the studied period. This confirms the conclusion that the best age for the slaughter of broilers is that established by asymmetric S-function.

樹木の辺材と葉はともに水分通道を担っており，それらの面積は蒸散量の推定の際に必要な情報である.また，辺材面積と葉面積のバランスは，樹木の生物的構造を理解する上でも重要な情報となる.そこで，日本の主要主人工林樹種であるヒノキを対象に，九州大学福岡演習林において合計121固体の辺材面積と葉面積の計測を行った.そのデータを多方面に資する目的で，ここに公開することとしたこれら辺材面積と葉面積は，相対成長を示す胸高直径(DBH) を用いた地域固有のアロメトリー式から推定されることが多いため，アロメトリー式の作成も行った. その結果, DBHが7.2～34.Ocmの範囲において辺材面積(As_tree)は, As_tree = 2.025DBH^1.4773(R^2= 0.97，葉面積(AL_tree)は, AL_tree = 2.025DBH^1.4773(R^2=0.97) なる式で表された. これに加え，葉量や心材面積等のその他の諸特性データの記載も行った., Sapwood and leaf have roles for water pathways in a tree. Their areas are important information for transpiration estimates. Also, the balance between sapwood area and leaf area is important for understanding a biologifal structure. We measured sapwood area and leaf area for 12 Japanese cypress (Chamaecyparis obtusa) trees in Kasuya Research Forest. We open the data for multiple purposes. Because their areas are generally estimated from area specific allometric equations using DBH, we developed the allometric equations. As a result, sapwood area (As_tree) and leaf area (AL_tree) are described as As_tree = 2.025DBH^1.4773 (R^2 = 0.97) and AL_tree = 2.025DBH^1.4773 (R^2 = 0.97) in the DBH range of 7.2 - 34.0cm, respectively. In addition, we listed the other data of the tree properties like leaf mass.

The objective of this study was to determine the maximum depth, structure, diameter and biomass of the roots of common woody species in two savanna physiognomies (savanna woodland and open woody savanna) in Brazil’s Pantanal wetland. The root systems of 37 trees and 34 shrubs of 15 savanna species were excavated to measure their length and depth and estimate the total root biomass through allometric relationships with stem diameter at ground level. In general, statistical regression models between root weight and stem diameter at ground level showed a significance of P

The root system of forest trees account for a significant proportion of the total forest biomass. However, data is particularly limited for forests in permafrost regions. In this study, therefore, we estimated the above- and belowground biomass of a black spruce (Picea mariana) stand underlain with permafrost in interior Alaska. Allometric equations were established using 4–6 sample trees to estimate the biomass of the aboveground parts and the coarse roots (roots >5 mm in diameter) of P. mariana trees. The aboveground biomass of understory plants and the fine-root biomass were estimated by destructive sampling. The aboveground and coarse-root biomasses of the P. mariana trees were estimated to be 3.97 and 2.31 kg m−2, respectively. The aboveground biomass of understory vascular plants such as Ledum groenlandicum and the biomass of forest floor mosses and lichens were 0.10 and 0.62 kg m−2, respectively. The biomass of fine roots

Resumen Chiapas, México, ocupa el primer lugar en superficie y producción de palma de aceite, se puede considerar como alternativa de mitigación del cambio climático, por el potencial de los cultivos perennes para fijar en su biomasa el carbono (C) que se libera en forma de CO2 ambiental. El objetivo de este trabajo fue medir el carbono capturado en la fracción aérea de la planta de la palma de aceite (Elaeis guineensis Jacq.). El estudio se realizó de enero del 2016 a junio del 2017 en tres regiones productoras; donde a veintiún plantas de doce años en promedio se les determinó la biomasa del estípite mediante la técnica del cono truncado, mientras que, para las hojas se utilizó la equivalencia del 65% de la biomasa del estípite. Con estos datos se realizó una estadística descriptiva para conocer los valores de biomasa. La cantidad de C se determinó por el método de Walkley y Black modificado por espectrofotometría de UV. La biomasa acumulada por planta fue de 1877,30 kg, que representó 268,45 t/ha con una densidad promedio de 143 plantas/ha. El 49,35% y 44,15% fue carbono en estípite y hojas, respectivamente; por tanto, la cantidad de este elemento fue 877,64 kg de carbono por planta, que representó 125,5 t/ha. Se generó una ecuación alométrica que estima la biomasa a partir del volumen del estípite (y = 243,86 + 990,61x), así como para la cantidad de carbono a partir de la biomasa (y = 149,07 + 0,39x). Se determinaron dos modelos alométricos con los datos obtenidos del cultivo de palma de aceite, los cuales se sugiere sean evaluados en campo para determinar el grado de confiabilidad en la estimación de biomasa y el carbono almacenado bajo condiciones agroclimáticas similares a las del presente estudio. Abstract Chiapas, Mexico, occupies the first place in surface and production of oil palm, as an alternative to mitigate climate change, for the potential of perennial crops to fix in their biomass the carbon (C) that is released in the form of environmental CO2. The objective of this work was to measure the carbon captured in the aerial fraction of the oil palm plant (Elaeis guineensis Jacq.). The study was conducted from January 2016 to June 2017 in three producing regions; where to twenty-one plants of twelve years on average, the stipe biomass was determined using the truncated cone technique, while for the leaves the equivalence of 65% of the biomass of the stipe was used. With these data, a descriptive statistic was made to know the biomass values. The amount of C was determined by the Walkley and Black method modified by UV spectrophotometry. The accumulated biomass per plant was 1877.30 kg, representing 268.45 t/ha with an average density of 143 plants/ha. 49.35% and 44.15% were carbon in stipe and leaves, respectively; therefore, the quantity of this element was 877.64 kg of carbon per plant, which represented 125.5 t/ha. An allometric equation was generated estimating the biomass from the volume of the stipe (y = 243.86 + 990.61x), as well as for the amount of carbon from the biomass (y = 149.07 + 0.39x). Two allometric models were determined with the data obtained from oil palm cultivation, which is suggested to be evaluated in the field to determine the degree of reliability in the estimation of biomass and carbon stored under the agroclimatic conditions similar to those of the present study.

Trees on farmlands and agricultural lands play a crucial role in small holder farmers’ livelihoods in addition to carbon regulation through carbon sequestration. These trees have received much attention recently due to their contribution to climate change mitigation through carbon storage. Quantification of carbon stocks in these trees has always proven difficult due to the spatial extent of these trees and methodological difficulties encountered during measurement. This paper reviews a number of studies done in quantification of biomass and soil carbon stocks in agroforestry within tropics. Most appropriate method employed in determination of carbon stock changes is through use of allometric equations. The equations use parameters like diameter at breast height (DBH), height, crown area which can be measured during field inventory. DBH has always proven to be the best parameter to be used in the equation since it is easy to measure and it does not need expensive equipments. Apart from trees, soils in agricultural lands have the capacity to store carbon and help mitigate effects of climate change. It then identifies the gap that future research can be done for accurate carbon quantification.