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.
