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https://repositorio.inpa.gov.br/handle/1/17579
Título: | The linkages between photosynthesis, productivity, growth and biomass in lowland Amazonian forests |
Autor: | Malhi, Yadvinder Singh Doughty, Christopher E. Goldsmith, Gregory R. Metcalfe, Daniel B. Girardin, Cécile A.J. Marthews, Toby R. Del Águila Pasquel, Jhon Aragao, L. E.O.C. Araujo-Murakami, Alejandro Brando, Paulo Monteiro Costa, Antônio Carlos Lôla da Silva-Espejo, Javier Eduardo Farfán-Amézquita, Filio F. Galbraith, David R. Quesada, Carlos Alberto Rocha, Wanderley Salinas, Norma Silvério, Divino Vicente Meir, Patrick W. Phillips, Oliver L. |
Palavras-chave: | Biomass Allocation Carbon Cycle Drought Forest Ecosystem Growth Rate Net Primary Production Nutrient Use Efficiency Photosynthesis Residence Time Respiration Tropical Forest Amazonia Carbon Animals Biomass Carbon Cycle Drought Forest Growth, Development And Aging Metabolism Photosynthesis South America Theoretical Model Tree Tropic Climate Animal Biomass Carbon Carbon Cycle Droughts Forests Models, Theoretical Photosynthesis South America Trees Tropical Climate |
Data do documento: | 2015 |
Revista: | Global Change Biology |
É parte de: | Volume 21, Número 6, Pags. 2283-2295 |
Abstract: | Understanding the relationship between photosynthesis, net primary productivity and growth in forest ecosystems is key to understanding how these ecosystems will respond to global anthropogenic change, yet the linkages among these components are rarely explored in detail. We provide the first comprehensive description of the productivity, respiration and carbon allocation of contrasting lowland Amazonian forests spanning gradients in seasonal water deficit and soil fertility. Using the largest data set assembled to date, ten sites in three countries all studied with a standardized methodology, we find that (i) gross primary productivity (GPP) has a simple relationship with seasonal water deficit, but that (ii) site-to-site variations in GPP have little power in explaining site-to-site spatial variations in net primary productivity (NPP) or growth because of concomitant changes in carbon use efficiency (CUE), and conversely, the woody growth rate of a tropical forest is a very poor proxy for its productivity. Moreover, (iii) spatial patterns of biomass are much more driven by patterns of residence times (i.e. tree mortality rates) than by spatial variation in productivity or tree growth. Current theory and models of tropical forest carbon cycling under projected scenarios of global atmospheric change can benefit from advancing beyond a focus on GPP. By improving our understanding of poorly understood processes such as CUE, NPP allocation and biomass turnover times, we can provide more complete and mechanistic approaches to linking climate and tropical forest carbon cycling. © 2015 John Wiley & Sons Ltd. |
DOI: | 10.1111/gcb.12859 |
Aparece nas coleções: | Artigos |
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