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Título: Variations in Amazon forest productivity correlated with foliar nutrients and modelled rates of photosynthetic carbon supply
Autor: Mercado, Lina
Patiño, Sandra
null, Tomas
Fyllas, Nikolaos M.
Weedon, Graham P.
Sitch, Stephen A.
Quesada, Carlos Alberto
Phillips, Oliver L.
Aragao, L. E.O.C.
Malhi, Yadvinder Singh
Dolman, A. Johannes
Restrepo-Coupé, Natalia
Saleska, Scott Reid
Baker, Timothy R.
Almeida, Samuel Miranda
Higuchi, Niro
Lloyd, Jon
Palavras-chave: Aboveground Biomass
Aboveground Production
Climate Change
Community Composition
Forestry Production
Growth Rate
Nutrient Availability
Nutrient Limitation
Soil Nutrient
Tropical Forest
Amazon Basin
Data do documento: 2011
Revista: Philosophical Transactions of the Royal Society B: Biological Sciences
Encontra-se em: Volume 366, Número 1582, Pags. 3316-3329
Abstract: The rate of above-ground woody biomass production, WP, in some western Amazon forests exceeds those in the east by a factor of 2 or more. Underlying causes may include climate, soil nutrient limitations and species composition. In this modelling paper, we explore the implications of allowing key nutrients such as N and P to constrain the photosynthesis of Amazon forests, and also we examine the relationship between modelled rates of photosynthesis and the observed gradients in WP. We use a model with current understanding of the underpinning biochemical processes as affected by nutrient availability to assess: (i) the degree to which observed spatial variations in foliar [N] and [P] across Amazonia affect stand-level photosynthesis; and (ii) how these variations in forest photosynthetic carbon acquisition relate to the observed geographical patterns of stem growth across the Amazon Basin. We find nutrient availability to exert a strong effect on photosynthetic carbon gain across the Basin and to be a likely important contributor to the observed gradient in WP. Phosphorus emerges as more important than nitrogen in accounting for the observed variations in productivity. Implications of these findings are discussed in the context of future tropical forests under a changing climate. © 2011 The Royal Society.
DOI: 10.1098/rstb.2011.0045
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