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Title: The linkages between photosynthesis, productivity, growth and biomass in lowland Amazonian forests
Authors: 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.
Keywords: Biomass Allocation
Carbon Cycle
Forest Ecosystem
Growth Rate
Net Primary Production
Nutrient Use Efficiency
Residence Time
Tropical Forest
Carbon Cycle
Growth, Development And Aging
South America
Theoretical Model
Tropic Climate
Carbon Cycle
Models, Theoretical
South America
Tropical Climate
Issue Date: 2015
metadata.dc.publisher.journal: Global Change Biology
metadata.dc.relation.ispartof: 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.
metadata.dc.identifier.doi: 10.1111/gcb.12859
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