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

Authors: Luiz E. O. C. Aragão; Yadvinder Malhi; Nikolaos M. Fyllas; Stephen Sitch; Stephen Sitch; Timothy R. Baker; A. J. Dolman; +14 Authors

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

Abstract

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.

Countries
Brazil, Australia, Netherlands, Netherlands, Brazil, United Kingdom
Keywords

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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    citations
    This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    70
    popularity
    This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
    Top 10%
    influence
    This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    Top 10%
    impulse
    This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
    Top 10%
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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
70
Top 10%
Top 10%
Top 10%
Green
bronze