@Article{Yang_GRL_20160716,
 author		= {Xiaojuan Yang and Peter E. Thornton and Daniel M. Ricciuto and Forrest M. Hoffman},
 title		= {Phosphorus Feedbacks May Constrain Tropical Ecosystem Responses to Changes in Atmospheric {CO$_2$} and Climate},
 journal	= GRL,
 volume		= 43,
 number		= 13,
 pages		= {7205--7214},
 doi		= {10.1002/2016GL069241},
 day		= 16,
 month		= jul,
 year		= 2016,
 abstract	= {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 CO$_2$ concentrations ([CO$_2$]) by about 26\%. Our exploratory simulations show that the response of tropical forest C cycling to increasing [CO$_2$] depends on how elevated CO$_2$ 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 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 [CO$_2$] affects phosphatase enzyme production; 2) more tropical leaf-scale measurements under different temperature/humidity conditions with different soil P availability.}
}