期刊
PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES
卷 366, 期 1582, 页码 3316-3329出版社
ROYAL SOC
DOI: 10.1098/rstb.2011.0045
关键词
modelling photosynthesis; nutrient limitation; Amazon forest
类别
资金
- EU Project [EVK 1999-0191]
- UK NERC Tropical Biomes in Transition (TROBIT) consortium
- UK Natural Environment Research Council (NERC) [NE/A/S/2003/00608/2]
- UK NERC Amazon Integrated Carbon Analysis-(AMAZONICA) consortium [NE/F005997/1]
- European Union
- European Community
- Joint DECC/Defra Met Office Hadley Centre [GA01101]
- Gordon and Betty Moore Foundation
- School of Geography, University of Leeds
- Royal Geographical Society
- CARBONSINK-LBA
- Max Planck Institute for Biogeochemistry, Jena, Germany
- Natural Environment Research Council
- EU
- US National Geographical Society
- WWF-US/Garden Club of America
- US National Science Foundation
- Nature Conservancy/Mellon Foundation
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico
- Museu Goeldi
- Estacao Cientifica Ferreira Penna
- Andrew W. Mellon Foundation
- NASA-LBA Programme
- Conservation, Food and Health Foundation
- MacArthur Foundation
- Fundacion Jatun Sacha
- Estacion Cientifica Yasunide la Pontificia Universidad Catolica del Ecuador
- Estacion de Biodiversidad Tiputini
- Conservation International
- ACEER
- Albergue Inkaterra
- Explorama Tours S.A.
- Explorers Inn
- IIAP
- INRENA
- UNAP
- UNSAAC
- NERC [NE/F005806/1] Funding Source: UKRI
- Natural Environment Research Council [NE/B503384/1, NE/B504630/1, CEH010021, ceh010023, NE/F005806/1] Funding Source: researchfish
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.
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