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Simulating Interactive Effects of Symbiotic Nitrogen Fixation, Carbon Dioxide Elevation, and Climatic Change on Legume Growth

Mei Yua, Q. Gao*,a and M. J. Shafferb

a MOE Key Lab of Environmental Change and Natural Disasters, Institute of Resources Science, Beijing Normal Univ., Beijing 100875, China
b USDA-ARS, Great Plains Systems Research, P.O. Box E, Fort Collins, CO 80522



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  		Fig. 1. Comparison between observed (dots) and simulated (lines) total biomass Mt and green biomass Mg (a, b), and root nodule biomass Mb (c, d), under contemporary and doubled CO2 concentration.

 


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  		Fig. 2. Simulated responses of total biomass Mt (g) and green biomass Mg (g) to elevated CO2 at well-watered conditions, with and without symbiotic nitrogen fixation. C0/C1, current/doubled CO2 concentration; N0/N1, without/with symbiotic nitrogen fixation.

 


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  		Fig. 3. Simulated responses of total plant biomass to climate change and CO2 elevation. (a) Contemporary CO2, varied climate, with symbiotic nitrogen fixation; (b) contemporary CO2 concentration, variable climate, with and without symbiotic nitrogen fixation; (c) variable CO2 and climate, with symbiotic nitrogen fixation. T0/T2, monthly mean temperature unchanged/increased by 2°C; P0/P1, monthly precipitation unchanged/increased by 10%; C0/C1, current/doubled CO2 concentration; N0/N1, without/with symbiotic nitrogen fixation.

 




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