Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 43, Issue 13, Pages 7205-7214Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/2016GL069241
Keywords
phosphorus; carbon; tropical; Amazon
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Funding
- U.S. Department of Energy, Office of Science, Biological and Environmental Research (BER) programs
- U.S. Department of Energy [DE-AC05-00OR22725]
- DOE Office of Science User Facility [DE-AC05-00OR22725]
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The effects of phosphorus (P) availability on carbon (C) cycling in the Amazon region are investigated using CLM-CNP. We demonstrate that the coupling of P dynamics reduces the simulated historical terrestrial C sink due to increasing atmospheric CO2 concentrations ([CO2]) by about 26%. Our exploratory simulations show that the response of tropical forest C cycling to increasing [CO2] depends on how elevated CO2 affects phosphatase enzyme production. The effects of warming are more complex, depending on the interactions between humidity, C, and nutrient dynamics. While a simulation with low humidity generally shows the reduction of net primary productivity (NPP), a second simulation with higher humidity suggests overall increases in NPP due to the dominant effects of reduced water stress and more nutrient availability. Our simulations point to the need for (1) new observations on how elevated [CO2] affects phosphatase enzyme production and (2) more tropical leaf-scale measurements under different temperature/humidity conditions with different soil P availability.
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