35 results on '"Camarero, Jesus Julio"'
Search Results
2. Functional diversity differently shapes growth resilience to drought for co-existing pine species
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Granda, Elena, Gazol, Antonio, and Camarero, Jesús Julio
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- 2018
3. Last-century forest productivity in a managed dry-edge Scots pine population : the two sides of climate warming
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Marqués, Laura, Madrigal-González, Jaime, Zavala, Miguel A., Camarero, Jesús Julio, and Hartig, Florian
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- 2018
4. Increasing drought effects on five European pines modulate ∆¹³C-growth coupling along a Mediterranean altitudinal gradient
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Shestakova, Tatiana A., Camarero, Jesús Julio, Ferrio, Juan Pedro, Knorre, Anastasia A., Gutiérrez, Emilia, and Voltas, Jordi
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- 2017
5. Spatiotemporal Variability in Tree Growth in the Central Pyrenees: Climatic and Site Influences
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Tardif, Jacques, Camarero, Jesús Julio, Ribas, Montse, and Gutiérrez, Emilia
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- 2003
6. When a Tree Dies in the Forest : Scaling Climate-Driven Tree Mortality to Ecosystem Water and Carbon Fluxes
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Anderegg, William R. L., Martinez-Vilalta, Jordi, Cailleret, Maxime, Camarero, Jesus Julio, Ewers, Brent E., Galbraith, David, Gessler, Arthur, Grote, Rüdiger, Huang, Cho-ying, Levick, Shaun R., Powell, Thomas L., Rowland, Lucy, Sánchez-Salguero, Raúl, and Trotsiuk, Volodymyr
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- 2016
7. Towards a common methodology for developing logistic tree mortality models based on ring-width data
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Cailleret, Maxime, Bigler, Christof, Bugmann, Harald, Camarero, Jesús Julio, Čufar, Katarina, Davi, Hendrik, Mészáros, Ilona, Minunno, Francesco, Peltoniemi, Mikko, Robert, Elisabeth M. R., Suarez, María Laura, Tognetti, Roberto, and Martínez-Vilalta, Jordi
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- 2016
8. Species interactions slow warming-induced upward shifts of treelines on the Tibetan Plateau
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Liang, Eryuan, Wang, Yafeng, Piao, Shilong, Lu, Xiaoming, Camarero, Jesús Julio, Zhu, Haifeng, Zhu, Liping, Ellison, Aaron M., Ciais, Philippe, and Peñuelas, Josep
- Published
- 2016
9. Forests synchronize their growth in contrasting Eurasian regions in response to climate warming
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Shestakova, Tatiana A., Gutiérrez, Emilia, Kirdyanov, Alexander V., Camarero, Jesús Julio, Génova, Mar, Knorre, Anastasia A., Linares, Juan Carlos, de Dios, Víctor Resco, Sánchez-Salguero, Raúl, and Voltas, Jordi
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- 2016
10. Seeing the trees for the forest: drivers of individual growth responses to climate in Pinus uncinata mountain forests
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Galván, Juan Diego, Camarero, Jesús Julio, and Gutiérrez, Emilia
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- 2014
11. Minimum wood density of Juniperus thurifera is a robust proxy of spring water availability in a continental Mediterranean climate
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Camarero, Jesús Julio, Rozas, Vicente, and Olano, José Miguel
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- 2014
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12. Age-related drought sensitivity of Atlas cedar (Cedrus atlantica) in the Moroccan Middle Atlas forests
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Linares, Juan Carlos, Taïqui, Lahcen, Sangüesa-Barreda, Gabriel, Seco, José Ignacio, and Camarero, Jesús Julio
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- 2013
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13. Response of vegetation to drought time-scales across global land biomes
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Vicente-Serrano, Sergio M., Gouveia, Célia, Camarero, Jesús Julio, Beguería, Santiago, Trigo, Ricardo, López-Moreno, Juan I., Azorín-Molina, César, Pasho, Edmond, Lorenzo-Lacruz, Jorge, Revuelto, Jesús, Morán-Tejeda, Enrique, and Sanchez-Lorenzo, Arturo
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- 2013
14. A critical thermal transition driving spring phenology of Northern Hemisphere conifers.
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Huang, Jian‐Guo, Zhang, Yaling, Wang, Minhuang, Yu, Xiaohan, Deslauriers, Annie, Fonti, Patrick, Liang, Eryuan, Mäkinen, Harri, Oberhuber, Walter, Rathgeber, Cyrille B. K., Tognetti, Roberto, Treml, Václav, Yang, Bao, Zhai, Lihong, Zhang, Jiao‐Lin, Antonucci, Serena, Bergeron, Yves, Camarero, Jesus Julio, Campelo, Filipe, and Čufar, Katarina
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PLANT phenology ,SPRING ,CLIMATE change ,PHENOLOGY ,CONIFERS ,GLOBAL warming - Abstract
Despite growing interest in predicting plant phenological shifts, advanced spring phenology by global climate change remains debated. Evidence documenting either small or large advancement of spring phenology to rising temperature over the spatio‐temporal scales implies a potential existence of a thermal threshold in the responses of forests to global warming. We collected a unique data set of xylem cell‐wall‐thickening onset dates in 20 coniferous species covering a broad mean annual temperature (MAT) gradient (−3.05 to 22.9°C) across the Northern Hemisphere (latitudes 23°–66° N). Along the MAT gradient, we identified a threshold temperature (using segmented regression) of 4.9 ± 1.1°C, above which the response of xylem phenology to rising temperatures significantly decline. This threshold separates the Northern Hemisphere conifers into cold and warm thermal niches, with MAT and spring forcing being the primary drivers for the onset dates (estimated by linear and Bayesian mixed‐effect models), respectively. The identified thermal threshold should be integrated into the Earth‐System‐Models for a better understanding of spring phenology in response to global warming and an improved prediction of global climate‐carbon feedbacks. [ABSTRACT FROM AUTHOR]
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- 2023
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15. Fine root seasonal dynamics, plasticity, and mycorrhization in 2 coexisting Mediterranean oaks with contrasting aboveground phenology
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COLL, Lluís, CAMARERO, Jesús Julio, and MARTÍNEZ DE ARAGÓN, Juan
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- 2012
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16. Influence of Topography on the Colonization of Subalpine Grasslands by the Thorny Cushion Dwarf Echinospartum horridum
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Komac, Benjamin, Alados, Concepción L., and Camarero, Jesus Julio
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- 2011
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17. Stand-structural effects on Heterobasidion abietinum-related mortality following drought events in Abies pinsapo
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Linares, Juan Carlos, Camarero, Jesús Julio, Bowker, Matthew A., Ochoa, Victoria, and Carreira, José Antonio
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- 2010
18. Competition modulates the adaptation capacity of forests to climatic stress: insights from recent growth decline and death in relict stands of the Mediterranean fir Abies pinsapo
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Linares, Juan Carlos, Camarero, Jesús Julio, and Carreira, José Antonio
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- 2010
19. Plastic Bimodal Xylogenesis in Conifers from Continental Mediterranean Climates
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Camarero, Jesús Julio, Olano, José Miguel, and Parras, Alfonso
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- 2010
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20. Seasonal Variability of Dry Matter Content and Its Relationship with Shoot Growth and Nonstructural Carbohydrates
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Palacio, Sara, Milla, Rubén, Albuixech, Jorge, Pérez-Rontomé, Carmen, Camarero, Jesús Julio, Maestro, Melchor, and Montserrat-Martí, Gabriel
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- 2008
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21. Early-Warning Signals of Individual Tree Mortality Based on Annual Radial Growth
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Cailleret, Maxime, Dakos, Vasilis, Jansen, Steven, Robert, Elisabeth, Aakala, Tuomas, Amoroso, Mariano, Antos, Joe, Bigler, Christof, Bugmann, Harald, Caccianaga, Marco, Camarero, Jesus-Julio, Cherubini, Paolo, Coyea, Marie, Das, Adrian, Davi, Hendrik, Gea-Izquierdo, Guillermo, Gillner, Sten, Haavik, Laurel, Hartmann, Henrik, Hereş, Ana-Maria, Hultine, Kevin, Janda, Pavel, Kane, Jeffrey, Kharuk, Viachelsav, Kitzberger, Thomas, Klein, Tamir, Levanic, Tom, Linares, Juan-Carlos, Lombardi, Fabio, Mäkinen, Harri, Meszaros, Ilona, Metsaranta, Juha, Oberhuber, Walter, Papadopoulos, Andreas, Petritan, Any Mary, Rohner, Brigitte, Sanguesa-Barreda, Gabriel, Smith, Jeremy, Stan, Amanda, Stojanovic, Dejan, Suarez, Maria-Laura, Svoboda, Miroslav, Trotsiuk, Volodymyr, Villalba, Ricardo, Westwood, Alana, Wyckoff, Peter, Martinez-Vilalta, Jordi, Dakos, Vasilis, Institut des cellules souches pour le traitement et l'étude des maladies monogéniques (I-STEM), Université d'Évry-Val-d'Essonne (UEVE)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Généthon, Institut des Sciences de l'Evolution de Montpellier (UMR ISEM), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-École pratique des hautes études (EPHE), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Montpellier (UM)-Institut de recherche pour le développement [IRD] : UR226-Centre National de la Recherche Scientifique (CNRS), Institute for Systematic Botany and Ecology, Universität Ulm - Ulm University [Ulm, Allemagne], Centre méditérannéen de médecine moléculaire (C3M), Université Nice Sophia Antipolis (1965 - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Institut National de la Santé et de la Recherche Médicale (INSERM), Helsingin yliopisto = Helsingfors universitet = University of Helsinki, Institute of Terrestrial Ecosystems (ITES), Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology [Zürich] (ETH Zürich), Swiss Federal Institute for Forest, Snow and Landscape Research WSL, Unité de Recherches Forestières Méditerranéennes (URFM), Institut National de la Recherche Agronomique (INRA), Centre européen de recherche et d'enseignement des géosciences de l'environnement (CEREGE), Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Institute of Forest Botany and Forest Zoology, Max-Planck-Institut für Biogeochemie (MPI-BGC), Czech University of Life Science, Universidad Nacional del Comahue [Neuquén] (UNCOMA), Agricultural Research Organization, Slovenian Forestry Institute, Dipartimento AGR, Università degli Studi Mediterranea di Reggio Calabria, Natural Resources Institute Finland (LUKE), University of Debrecen, Leopold Franzens Univ Innsbruck, Inst Bot, Innsbruck, Austria, Université Paris Diderot - Paris 7 (UPD7), Department of Forestry and Natural Environment Management, Technological Education Institute of Lamia, Institute of Terretrial Ecosystems, Instituto Pirenaico de Ecologia = Pyrenean Institute of Ecology (IPE), University of Novi Sad, Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales [Mendoza] (CONICET-IANIGLA), Consejo Nacional de Investigaciones Científicas y Técnicas [Buenos Aires] (CONICET)-Universidad Nacional de Cuyo [Mendoza] (UNCUYO), Ecolog Unit, Universitat Autònoma de Barcelona (UAB), FP1106, P4-0015, NKFI-SNN-125652, PN-III-P1-1.1-TE-2016-1508, FJCI 2016-30121, III 43007, Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-École Pratique des Hautes Études (EPHE), Instituto Pirenaico de Ecologìa = Pyrenean Institute of Ecology [Zaragoza] (IPE - CSIC), École pratique des hautes études (EPHE), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Montpellier (UM)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre National de la Recherche Scientifique (CNRS)-Institut de recherche pour le développement [IRD] : UR226, Université Nice Sophia Antipolis (... - 2019) (UNS), University of Helsinki, Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Collège de France (CdF (institution))-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS)-Institut National de la Recherche Agronomique (INRA), Natural resources institute Finland, Instituto Pirenaico de Ecologia (IPE), and Consejo Superior de Investigaciones Científicas [Madrid] (CSIC)
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[SDE] Environmental Sciences ,[SDE.BE] Environmental Sciences/Biodiversity and Ecology ,forest ,growth ,[SDE]Environmental Sciences ,tree mortality ,drought ,[SDE.BE]Environmental Sciences/Biodiversity and Ecology ,biotic agents ,variance ,resilience indicators ,ring-width - Abstract
International audience; Tree mortality is a key driver of forest dynamics and its occurrence is projected to increase in the future due to climate change. Despite recent advances in our understanding of the physiological mechanisms leading to death, we still lack robust indicators of mortality risk that could be applied at the individual tree scale. Here, we build on a previous contribution exploring the differences in growth level between trees that died and survived a given mortality event to assess whether changes in temporal autocorrelation, variance, and synchrony in time-series of annual radial growth data can be used as early warning signals of mortality risk. Taking advantage of a unique global ring-width database of 3065 dead trees and 4389 living trees growing together at 198 sites (belonging to 36 gymnosperm and angiosperm species), we analyzed temporal changes in autocorrelation, variance, and synchrony before tree death (diachronic analysis), and also compared these metrics between trees that died and trees that survived a given mortality event (synchronic analysis). Changes in autocorrelation were a poor indicator of mortality risk. However, we found a gradual increase in inter- annual growth variability and a decrease in growth synchrony in the last similar to 20 years before mortality of gymnosperms, irrespective of the cause of mortality. These changes could be associated with drought-induced alterations in carbon economy and allocation patterns. In angiosperms, we did not find any consistent changes in any metric. Such lack of any signal might be explained by the relatively high capacity of angiosperms to recover after a stress-induced growth decline. Our analysis provides a robust method for estimating early-warning signals of tree mortality based on annual growth data. In addition to the frequently reported decrease in growth rates, an increase in inter-annual growth variability and a decrease in growth synchrony may be powerful predictors of gymnosperm mortality risk, but not necessarily so for angiosperms.
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- 2019
22. The impact of drought spells on forests depends on site conditions: The case of 2017 summer heat wave in southern Europe.
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Rita, Angelo, Camarero, Jesus Julio, Nolè, Angelo, Borghetti, Marco, Brunetti, Michele, Pergola, Nicola, Serio, Carmine, Vicente‐Serrano, Sergio M., Tramutoli, Valerio, and Ripullone, Francesco
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HEAT waves (Meteorology) , *WATER balance (Hydrology) , *NORMALIZED difference vegetation index , *DROUGHTS , *PRECIPITATION variability , *CLUSTER pine , *FOREST productivity - Abstract
A major component of climate change is an increase in temperature and precipitation variability. Over the last few decades, an increase in the frequency of extremely warm temperatures and drought severity has been observed across Europe. These warmer and drier conditions may reduce productivity and trigger compositional shifts in forest communities. However, we still lack a robust, biogeographical characterization of the negative impacts of climate extremes, such as droughts on forests. In this context, we investigated the impact of the 2017 summer drought on European forests. The normalized difference vegetation index (NDVI) was used as a proxy of forest productivity and was related to the standardized precipitation evapotranspiration index, which accounts for the temperature effects of the climate water balance. The spatial pattern of NDVI reduction in 2017 was largely driven by the extremely warm summer for parts of the central and eastern Mediterranean Basin (Italian and Balkan Peninsulas). The vulnerability to the 2017 summer drought was heterogeneously distributed over Europe, and topographic factors buffered some of the negative impacts. Mediterranean forests dominated by oak species were the most negatively impacted, whereas Pinus pinaster was the most resilient species. The impact of drought on the NDVI decreased at high elevations and mainly on east and north‐east facing slopes. We illustrate how an adequate characterization of the coupling between climate conditions and forest productivity (NDVI) allows the determination of the most vulnerable areas to drought. This approach could be widely used for other extreme climate events and when considering other spatially resolved proxies of forest growth and health. [ABSTRACT FROM AUTHOR]
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- 2020
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23. Climate seasonality limits carbon assimilation and storage in tropical forests
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Wagner, Fabien, Hérault, Bruno, Bonnal, Damien, Stahl, Clément, Anderson, Liana O., Baker, Timothy R., Becker, Gabriel Sebastian, Beeckman, Hans, Boanerges Souza, Danilo, Botosso, Paulo Cesar, Bowman, David M.J.S., Bräuning, Achim, Brede, Benjamin, Brown, Foster Irving, Camarero, Jesus Julio, Barbosa de Camargo, Plínio, Cardoso, Fernanda C.G., Alvim Carvalho, Fabrício, Castro, Wendeson, Koloski Chagas, Rubens, Chave, Jérôme, Chidumayo, Emmanuel N., Clark, Deborah A., Capellotto Costa, Flavia Regina, Couralet, Camille, da Silva Mauricio, Paulo Henrique, Dalitz, Helmut, Resende de Castro, Vinicius, de Freitas Milani, Jaçanan Eloisa, de Oliveira, Edilson Consuelo, de Souza Arruda, Luciano, Devineau, Jean-Louis, Drew, Davd M., Dünisch, Olivier, Durigan, Giselda, Elifuraha, Elisha, Fedele, Marcio, Ferreira Fedele, Ligia, Figueiredo Filho, Afonso, Guimarães Finger, César Augusto, Franco, Augusto César, Freitas Júnior, João Lima, Galvão, Franklin, Gebrekirstos, Aster, Gliniars, Robert, de Alencastro Graça, Paulo Maurício Lima, Griffiths, Anthony D., Grogan, James, Guan, Kaiyu, Homeier, Jürgen, Kanieski, Maria Raquel, Khoon Kho, Lip, Koenig, Jennifer, kohler, Sintia Valerio, Krepkowski, Julia, Lemos-Filho, José Pires, Lieberman, Diana, Lieberman, Milton Eugene, Lisi, Claudio Sergio, Longhi Santos, Tomaz, López Ayala, José Luis, Eijji Maeda, Eduardo, Malhi, Yadvinder, Maria, Vivian R.B., Marques, Marcia C.M., Marques, Renato, Maza Maza Chamba, Hector, Mbwambo, Lawrence, Lisboa Melgaço, Karina Liana, Mendivelso, Hooz Angela, Murphy, Brett P., O'Brien, Joseph J., Oberbauer, Steven F., Okada, Naoki, Pélissier, Raphaël, Prior, Lynda D., Roig, Fidel Alejandro, Ross, Michael, Rossatto, Davi Rodrigo, and Rossi, Vivien
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Litière forestière ,Saison ,Pluviométrie ,F60 - Physiologie et biochimie végétale ,Lumière ,forêt tropicale ,Bois ,K01 - Foresterie - Considérations générales ,Photosynthèse ,Climat ,Indice de surface foliaire ,Évapotranspiration ,séquestration du carbone ,Écosystème forestier ,production ,Cycle du carbone - Abstract
The seasonal climate drivers of the carbon cycle in tropical forests remain poorly known, although these forests account for more carbon assimilation and storage than any other terrestrial ecosystem. Based on a unique combination of seasonal pan-tropical data sets from 89 experimental sites (68 include aboveground wood productivity measurements and 35 litter productivity measurements), their associate canopy photosynthetic capacity (enhanced vegetation index, EVI) and climate, we ask how carbon assimilation and aboveground allocation are related to climate seasonality in tropical forests and how they interact in the seasonal carbon cycle. We found that canopy photosynthetic capacity seasonality responds positively to precipitation when rainfall is < 2000 mm.yr−1 (water-limited forests) and to radiation otherwise (light-limited forests); on the other hand, independent of climate limitations, wood productivity and litterfall are driven by seasonal variation in precipitation and evapotranspiration respectively. Consequently, light-limited forests present an asynchronism between canopy photosynthetic capacity and wood productivity. Precipitation first-order control indicates an overall decrease in tropical forest productivity in a drier climate.
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- 2016
24. Regime shifts of Mediterranean forest carbon uptake and reduced resilience driven by multidecadal ocean surface temperatures.
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Carnicer, Jofre, Domingo‐Marimon, Cristina, Ninyerola, Miquel, Camarero, Jesus Julio, Bastos, Ana, López‐Parages, Jorge, Blanquer, Laura, Rodríguez‐Fonseca, Belén, Lenton, Timothy M., Dakos, Vasilis, Ribas, Montserrat, Gutiérrez, Emilia, Peñuelas, Josep, and Pons, Xavier
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ATLANTIC multidecadal oscillation ,OCEAN temperature ,SURFACE temperature ,CARBON cycle ,LAND surface temperature ,NORTH Atlantic oscillation ,SOUTHERN oscillation - Abstract
The mechanisms translating global circulation changes into rapid abrupt shifts in forest carbon capture in semi‐arid biomes remain poorly understood. Here, we report unprecedented multidecadal shifts in forest carbon uptake in semi‐arid Mediterranean pine forests in Spain over 1950–2012. The averaged carbon sink reduction varies between 31% and 37%, and reaches values in the range of 50% in the most affected forest stands. Regime shifts in forest carbon uptake are associated with climatic early warning signals, decreased forest regional synchrony and reduced long‐term carbon sink resilience. We identify the mechanisms linked to ocean multidecadal variability that shape regime shifts in carbon capture. First, we show that low‐frequency variations of the surface temperature of the Atlantic Ocean induce shifts in the non‐stationary effects of El Niño Southern Oscillation (ENSO) on regional forest carbon capture. Modelling evidence supports that the non‐stationary effects of ENSO can be propagated from tropical areas to semi‐arid Mediterranean biomes through atmospheric wave trains. Second, decadal changes in the Atlantic Multidecadal Oscillation (AMO) significantly alter sea–air heat exchanges, modifying in turn ocean vapour transport over land and land surface temperatures, and promoting sustained drought conditions in spring and summer that reduce forest carbon uptake. Third, we show that lagged effects of AMO on the winter North Atlantic Oscillation also contribute to the maintenance of long‐term droughts. Finally, we show that the reported strong, negative effects of ocean surface temperature (AMO) on forest carbon uptake in the last decades are unprecedented over the last 150 years. Our results provide new, unreported explanations for carbon uptake shifts in these drought‐prone forests and review the expected impacts of global warming on the profiled mechanisms. [ABSTRACT FROM AUTHOR]
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- 2019
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25. Chilling and forcing temperatures interact to predict the onset of wood formation in Northern Hemisphere conifers.
- Author
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Delpierre, Nicolas, Lireux, Ségolène, Hartig, Florian, Camarero, Jesus Julio, Cheaib, Alissar, Čufar, Katarina, Cuny, Henri, Deslauriers, Annie, Fonti, Patrick, Gričar, Jožica, Huang, Jian‐Guo, Krause, Cornelia, Liu, Guohua, de Luis, Martin, Mäkinen, Harri, del Castillo, Edurne Martinez, Morin, Hubert, Nöjd, Pekka, Oberhuber, Walter, and Prislan, Peter
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CONIFERS ,EFFECT of temperature on trees ,PHENOLOGY ,XYLEM ,CAMBIUM - Abstract
The phenology of wood formation is a critical process to consider for predicting how trees from the temperate and boreal zones may react to climate change. Compared to leaf phenology, however, the determinism of wood phenology is still poorly known. Here, we compared for the first time three alternative ecophysiological model classes (threshold models, heat‐sum models and chilling‐influenced heat‐sum models) and an empirical model in their ability to predict the starting date of xylem cell enlargement in spring, for four major Northern Hemisphere conifers (Larix decidua, Pinus sylvestris, Picea abies and Picea mariana). We fitted models with Bayesian inference to wood phenological data collected for 220 site‐years over Europe and Canada. The chilling‐influenced heat‐sum model received most support for all the four studied species, predicting validation data with a 7.7‐day error, which is within one day of the observed data resolution. We conclude that both chilling and forcing temperatures determine the onset of wood formation in Northern Hemisphere conifers. Importantly, the chilling‐influenced heat‐sum model showed virtually no spatial bias whichever the species, despite the large environmental gradients considered. This suggests that the spring onset of wood formation is far less affected by local adaptation than by environmentally driven plasticity. In a context of climate change, we therefore expect rising winter–spring temperature to exert ambivalent effects on the spring onset of wood formation, tending to hasten it through the accumulation of forcing temperature, but imposing a higher forcing temperature requirement through the lower accumulation of chilling. A temperature sum model influenced by chilling accumulation predicts the spring onset of xylem enlargement across temperate and boreal latitudes, in four major Northern Hemisphere conifers. This model outperformed heat‐sums and threshold models. On the figure, plots per species show predicted (coloured lines) and observed (grey dots) xylem onset dates, sorted by temperatures during the January–June period. The central plot shows the species‐specific relation between chilling and forcing accumulation. [ABSTRACT FROM AUTHOR]
- Published
- 2019
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26. Moisture‐mediated responsiveness of treeline shifts to global warming in the Himalayas.
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Sigdel, Shalik Ram, Wang, Yafeng, Camarero, Jesus Julio, Zhu, Haifeng, Liang, Eryuan, and Peñuelas, Josep
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TIMBERLINE ,GLOBAL warming ,FOREST management ,METEOROLOGICAL precipitation ,CLIMATE change - Abstract
Among forest ecosystems, the alpine treeline ecotone can be considered to be a simplified model to study global ecology and climate change. Alpine treelines are expected to shift upwards in response to global warming given that tree recruitment and growth are assumed to be mainly limited by low temperatures. However, little is known whether precipitation and temperature interact to drive long‐term Himalayan treeline dynamics. Tree growth is affected by spring rainfall in the central Himalayan treelines, being good locations for testing if, in addition to temperature, precipitation mediates treeline dynamics. To test this hypothesis, we reconstructed spatiotemporal variations in treeline dynamics in 20 plots located at six alpine treeline sites, dominated by two tree species (birch, fir), and situated along an east–west precipitation gradient in the central Himalayas. Our reconstructions evidenced that treelines shifted upward in response to recent climate warming, but their shift rates were primarily mediated by spring precipitation. The rate of upward shift was higher in the wettest eastern Himalayas, suggesting that its ascent rate was facilitated by spring precipitation. The drying tendency in association with the recent warming trends observed in the central Himalayas, however, will likely hinder an upslope advancement of alpine treelines and promote downward treeline shifts if moisture availability crosses a critical minimum threshold. Our study highlights the complexity of plant responses to climate and the need to consider multiple climate factors when analyzing treeline dynamics. Based on 20 treeline plots along an east–west precipitation gradient in the central Himalayas, this research showed that treelines shifted upward in response to recent climate warming, but their shift rates were mediated by spring precipitation. The drying tendency in association with the recent warming trends observed in the central Himalayas, however, will likely hinder an upslope advancement of alpine treelines and promote downward treeline shifts if moisture availability crosses a critical minimum threshold. Our study highlights the complexity of plant responses to climate and the need to consider multiple climate factors when analyzing treeline dynamics. [ABSTRACT FROM AUTHOR]
- Published
- 2018
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27. Standardized metrics are key for assessing drought severity.
- Author
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Slette, Ingrid J., Smith, Melinda D., Knapp, Alan K., Vicente‐Serrano, Sergio M., Camarero, Jesus Julio, and Beguería, Santiago
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DROUGHTS - Abstract
This article is a response to Zang et al., 26, 322–324. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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28. Forest resilience to drought varies across biomes.
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Gazol, Antonio, Camarero, Jesus Julio, Vicente‐Serrano, Sergio M., Sánchez‐Salguero, Raúl, Gutiérrez, Emilia, de Luis, Martin, Sangüesa‐Barreda, Gabriel, Novak, Klemen, Rozas, Vicente, Tíscar, Pedro A., Linares, Juan C., Martín‐Hernández, Natalia, Martínez del Castillo, Edurne, Ribas, Montse, García‐González, Ignacio, Silla, Fernando, Camisón, Alvaro, Génova, Mar, Olano, José M., and Longares, Luis A.
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FOREST resilience , *EFFECT of drought on plants , *FOREST productivity , *ANGIOSPERMS , *GYMNOSPERMS , *NORMALIZED difference vegetation index - Abstract
Abstract: Forecasted increase drought frequency and severity may drive worldwide declines in forest productivity. Species‐level responses to a drier world are likely to be influenced by their functional traits. Here, we analyse forest resilience to drought using an extensive network of tree‐ring width data and satellite imagery. We compiled proxies of forest growth and productivity (TRWi, absolutely dated ring‐width indices; NDVI, Normalized Difference Vegetation Index) for 11 tree species and 502 forests in Spain corresponding to Mediterranean, temperate, and continental biomes. Four different components of forest resilience to drought were calculated based on TRWi and NDVI data before, during, and after four major droughts (1986, 1994–1995, 1999, and 2005), and pointed out that TRWi data were more sensitive metrics of forest resilience to drought than NDVI data. Resilience was related to both drought severity and forest composition. Evergreen gymnosperms dominating semi‐arid Mediterranean forests showed the lowest resistance to drought, but higher recovery than deciduous angiosperms dominating humid temperate forests. Moreover, semi‐arid gymnosperm forests presented a negative temporal trend in the resistance to drought, but this pattern was absent in continental and temperate forests. Although gymnosperms in dry Mediterranean forests showed a faster recovery after drought, their recovery potential could be constrained if droughts become more frequent. Conversely, angiosperms and gymnosperms inhabiting temperate and continental sites might have problems to recover after more intense droughts since they resist drought but are less able to recover afterwards. [ABSTRACT FROM AUTHOR]
- Published
- 2018
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29. Diverging shrub and tree growth from the Polar to the Mediterranean biomes across the European continent.
- Author
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Pellizzari, Elena, Camarero, Jesus Julio, Gazol, Antonio, Granda, Elena, Shetti, Rohan, Wilmking, Martin, Moiseev, Pavel, Pividori, Mario, and Carrer, Marco
- Subjects
- *
SHRUBS , *TREES & climate , *TREE development , *JUNIPERS - Abstract
Climate warming is expected to enhance productivity and growth of woody plants, particularly in temperature-limited environments at the northernmost or uppermost limits of their distribution. However, this warming is spatially uneven and temporally variable, and the rise in temperatures differently affects biomes and growth forms. Here, applying a dendroecological approach with generalized additive mixed models, we analysed how the growth of shrubby junipers and coexisting trees (larch and pine species) responds to rising temperatures along a 5000-km latitudinal range including sites from the Polar, Alpine to the Mediterranean biomes. We hypothesize that, being more coupled to ground microclimate, junipers will be less influenced by atmospheric conditions and will less respond to the post-1950 climate warming than coexisting standing trees. Unexpectedly, shrub and tree growth forms revealed divergent growth trends in all the three biomes, with juniper performing better than trees at Mediterranean than at Polar and Alpine sites. The post-1980s decline of tree growth in Mediterranean sites might be induced by drought stress amplified by climate warming and did not affect junipers. We conclude that different but coexisting long-living growth forms can respond differently to the same climate factor and that, even in temperature-limited area, other drivers like the duration of snow cover might locally play a fundamental role on woody plants growth across Europe. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
30. Assessing forest vulnerability to climate warming using a process-based model of tree growth: bad prospects for rear-edges.
- Author
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Sánchez‐Salguero, Raúl, Camarero, Jesus Julio, Gutiérrez, Emilia, González Rouco, Fidel, Gazol, Antonio, Sangüesa‐Barreda, Gabriel, Andreu‐Hayles, Laia, Linares, Juan Carlos, and Seftigen, Kristina
- Subjects
- *
CLIMATE change , *TREE growth , *GLOBAL warming , *SILVER fir , *SCOTS pine - Abstract
Growth models can be used to assess forest vulnerability to climate warming. If global warming amplifies water deficit in drought-prone areas, tree populations located at the driest and southernmost distribution limits (rear-edges) should be particularly threatened. Here, we address these statements by analyzing and projecting growth responses to climate of three major tree species (silver fir, Abies alba; Scots pine, Pinus sylvestris; and mountain pine, Pinus uncinata) in mountainous areas of NE Spain. This region is subjected to Mediterranean continental conditions, it encompasses wide climatic, topographic and environmental gradients, and, more importantly, it includes rear-edges of the continuous distributions of these tree species. We used tree-ring width data from a network of 110 forests in combination with the process-based Vaganov-Shashkin-Lite growth model and climate-growth analyses to forecast changes in tree growth during the 21st century. Climatic projections were based on four ensembles CO2 emission scenarios. Warm and dry conditions during the growing season constrain silver fir and Scots pine growth, particularly at the species rear-edge. By contrast, growth of high-elevation mountain pine forests is enhanced by climate warming. The emission scenario ( RCP 8.5) corresponding to the most pronounced warming (+1.4 to 4.8 °C) forecasted mean growth reductions of −10.7% and −16.4% in silver fir and Scots pine, respectively, after 2050. This indicates that rising temperatures could amplify drought stress and thus constrain the growth of silver fir and Scots pine rear-edge populations growing at xeric sites. Contrastingly, mountain pine growth is expected to increase by +12.5% due to a longer and warmer growing season. The projections of growth reduction in silver fir and Scots pine portend dieback and a contraction of their species distribution areas through potential local extinctions of the most vulnerable driest rear-edge stands. Our modeling approach provides accessible tools to evaluate forest vulnerability to warmer conditions. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
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31. Climate seasonality limits leaf carbon assimilation and wood productivity in tropical forests.
- Author
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Wagner, Fabien H., Hérault, Bruno, Bonal, Damien, Stahl, Clément, Anderson, Liana O., Baker, Timothy R., Becker, Gabriel Sebastian, Beeckman, Hans, Souza, Danilo Boanerges, Botosso, Paulo Cesar, Bowman, David M. J. S., Bräuning, Achim, Brede, Benjamin, Brown, Foster Irving, Camarero, Jesus Julio, Camargo, Plínio Barbosa, Cardoso, Fernanda C. G., Carvalho, Fabrício Alvim, Castro, Wendeson, and Chagas, Rubens Koloski
- Subjects
TROPICAL forests ,PLANT water requirements ,NATURAL resources ,WATER conservation ,WATER damage - Abstract
The seasonal climate drivers of the carbon cycle in tropical forests remain poorly known, although these forests account for more carbon assimilation and storage than any other terrestrial ecosystem. Based on a unique combination of seasonal pan-tropical data sets from 89 experimental sites (68 include aboveground wood productivity measurements and 35 litter productivity measurements), their associated canopy photosynthetic capacity (enhanced vegetation index, EVI) and climate, we ask how carbon assimilation and aboveground allocation are related to climate seasonality in tropical forests and how they interact in the seasonal carbon cycle. We found that canopy photosynthetic capacity seasonality responds positively to precipitation when rainfall is < 2000mmyr
-1 (water-limited forests) and to radiation otherwise (light-limited forests). On the other hand, independent of climate limitations, wood productivity and litterfall are driven by seasonal variation in precipitation and evapotranspiration, respectively. Consequently, light-limited forests present an asynchronism between canopy photosynthetic capacity and wood productivity. First-order control by precipitation likely indicates a decrease in tropical forest productivity in a drier climate in water-limited forest, and in current light-limited forest with future rainfall < 2000mmyr-1 . [ABSTRACT FROM AUTHOR]- Published
- 2016
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32. Dispersal limitation and spatial scale affect model based projections of Pinus uncinata response to climate change in the Pyrenees.
- Author
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Martínez, Isabel, González-Taboada, Fernando, Wiegand, Thorsten, Camarero, Jesus Julio, and Gutiérrez, Emilia
- Subjects
CLIMATE change ,ANIMAL dispersal ,SPECIES distribution ,TROPOSPHERIC circulation ,ECOTONES - Abstract
Species Distribution Models ( SDMs) were employed to assess the potential impact of climate change on the distribution of Pinus uncinata in the Pyrenees, where it is the dominant tree species in subalpine forest and alpine tree lines. Predicting forest response to climate change is a challenging task in mountain regions but also a conservation priority. We examined the potential impact of spatial scale on SDM projections by conducting all analyses at four spatial resolutions. We further examined the potential effect of dispersal constraints by applying a threshold distance of maximal advancement derived from a spatially explicit, individual-based simulation model of tree line dynamics. Under current conditions, SDM s including climatic factors related to stress or growth limitation performed best. These models were then employed to project P. uncinata distribution under two emission scenarios, using data generated from several regional climate models. At the end of this century, P. uncinata is expected to migrate northward and upward, occupying habitat currently inhabited by alpine plant species. However, consideration of dispersal limitation and/or changing the spatial resolution of the analysis modified the assessment of climate change impact on mountain ecosystems, especially in the case of estimates of colonization and extinction at the regional scale. Our study highlights the need to improve the characterization of biological processes within SDMs, as well as to consider simultaneously different scales when assessing potential habitat loss under future climate conditions. [ABSTRACT FROM AUTHOR]
- Published
- 2012
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33. Mapping and disentangling the impacts of extreme heat and drought on European forests.
- Author
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Ripullone, Francesco, Rita, Angelo, Camarero, Jesus Julio, Nolè, Angelo, Vicente-Serrano, Sergio, Pericolo, Osvaldo, and Borghetti, Marco
- Published
- 2019
34. Early-Warning Signals of Individual Tree Mortality Based on Annual Radial Growth.
- Author
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Cailleret M, Dakos V, Jansen S, Robert EMR, Aakala T, Amoroso MM, Antos JA, Bigler C, Bugmann H, Caccianaga M, Camarero JJ, Cherubini P, Coyea MR, Čufar K, Das AJ, Davi H, Gea-Izquierdo G, Gillner S, Haavik LJ, Hartmann H, Hereş AM, Hultine KR, Janda P, Kane JM, Kharuk VI, Kitzberger T, Klein T, Levanic T, Linares JC, Lombardi F, Mäkinen H, Mészáros I, Metsaranta JM, Oberhuber W, Papadopoulos A, Petritan AM, Rohner B, Sangüesa-Barreda G, Smith JM, Stan AB, Stojanovic DB, Suarez ML, Svoboda M, Trotsiuk V, Villalba R, Westwood AR, Wyckoff PH, and Martínez-Vilalta J
- Abstract
Tree mortality is a key driver of forest dynamics and its occurrence is projected to increase in the future due to climate change. Despite recent advances in our understanding of the physiological mechanisms leading to death, we still lack robust indicators of mortality risk that could be applied at the individual tree scale. Here, we build on a previous contribution exploring the differences in growth level between trees that died and survived a given mortality event to assess whether changes in temporal autocorrelation, variance, and synchrony in time-series of annual radial growth data can be used as early warning signals of mortality risk. Taking advantage of a unique global ring-width database of 3065 dead trees and 4389 living trees growing together at 198 sites (belonging to 36 gymnosperm and angiosperm species), we analyzed temporal changes in autocorrelation, variance, and synchrony before tree death (diachronic analysis), and also compared these metrics between trees that died and trees that survived a given mortality event (synchronic analysis). Changes in autocorrelation were a poor indicator of mortality risk. However, we found a gradual increase in inter-annual growth variability and a decrease in growth synchrony in the last ∼20 years before mortality of gymnosperms, irrespective of the cause of mortality. These changes could be associated with drought-induced alterations in carbon economy and allocation patterns. In angiosperms, we did not find any consistent changes in any metric. Such lack of any signal might be explained by the relatively high capacity of angiosperms to recover after a stress-induced growth decline. Our analysis provides a robust method for estimating early-warning signals of tree mortality based on annual growth data. In addition to the frequently reported decrease in growth rates, an increase in inter-annual growth variability and a decrease in growth synchrony may be powerful predictors of gymnosperm mortality risk, but not necessarily so for angiosperms.
- Published
- 2019
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35. Woody biomass production lags stem-girth increase by over one month in coniferous forests.
- Author
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Cuny HE, Rathgeber CB, Frank D, Fonti P, Mäkinen H, Prislan P, Rossi S, Del Castillo EM, Campelo F, Vavrčík H, Camarero JJ, Bryukhanova MV, Jyske T, Gričar J, Gryc V, De Luis M, Vieira J, Čufar K, Kirdyanov AV, Oberhuber W, Treml V, Huang JG, Li X, Swidrak I, Deslauriers A, Liang E, Nöjd P, Gruber A, Nabais C, Morin H, Krause C, King G, and Fournier M
- Abstract
Wood is the main terrestrial biotic reservoir for long-term carbon sequestration(1), and its formation in trees consumes around 15% of anthropogenic carbon dioxide emissions each year(2). However, the seasonal dynamics of woody biomass production cannot be quantified from eddy covariance or satellite observations. As such, our understanding of this key carbon cycle component, and its sensitivity to climate, remains limited. Here, we present high-resolution cellular based measurements of wood formation dynamics in three coniferous forest sites in northeastern France, performed over a period of 3 years. We show that stem woody biomass production lags behind stem-girth increase by over 1 month. We also analyse more general phenological observations of xylem tissue formation in Northern Hemisphere forests and find similar time lags in boreal, temperate, subalpine and Mediterranean forests. These time lags question the extension of the equivalence between stem size increase and woody biomass production to intra-annual time scales(3, 4, 5, 6). They also suggest that these two growth processes exhibit differential sensitivities to local environmental conditions. Indeed, in the well-watered French sites the seasonal dynamics of stem-girth increase matched the photoperiod cycle, whereas those of woody biomass production closely followed the seasonal course of temperature. We suggest that forecasted changes in the annual cycle of climatic factors(7) may shift the phase timing of stem size increase and woody biomass production in the future.
- Published
- 2015
- Full Text
- View/download PDF
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