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Variations in Amazon forest productivity correlated with foliar nutrients and modelled rates of photosynthetic carbon supply

pmid: 22006971
pmc: PMC3179632
The rate of above-ground woody biomass production, W P , 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 W P . 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 W P . 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.
- University of Oxford United Kingdom
- University of Arizona United States
- Max Planck Society Germany
- University of Amsterdam Netherlands
- University of Technology Sydney Australia
Aboveground Production, 550, Nitrogen, Climate Change, 551, Models, Biological, Atmospheric Sciences, Aboveground Biomass, Trees, Soil, Amazon forest, Growth Rate, Nutrient Availability, Community Composition, Tropical Forest, modelling photosynthesis, Computer Simulation, Photosynthesis, Amazon Basin, nutrient limitation, Tropical Climate, Forestry Production, Plant Stems, Atmosphere, Phosphorus, Soil Nutrient, Underpinning, Carbon Dioxide, Wood, Carbon, Plant Leaves, Earth Sciences, Nutrient Limitation, SDG 6 - Clean Water and Sanitation, Brazil
Aboveground Production, 550, Nitrogen, Climate Change, 551, Models, Biological, Atmospheric Sciences, Aboveground Biomass, Trees, Soil, Amazon forest, Growth Rate, Nutrient Availability, Community Composition, Tropical Forest, modelling photosynthesis, Computer Simulation, Photosynthesis, Amazon Basin, nutrient limitation, Tropical Climate, Forestry Production, Plant Stems, Atmosphere, Phosphorus, Soil Nutrient, Underpinning, Carbon Dioxide, Wood, Carbon, Plant Leaves, Earth Sciences, Nutrient Limitation, SDG 6 - Clean Water and Sanitation, Brazil
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