Carbon balance

The photosynthesis calculation passes daily integrals of and to the carbon balance to compute gross and net primary productivity (GPP and NPP, respectively) on a daily time step. While GPP describes the amount of carbon taken up through photosynthesis, NPP stands only for the part converted into plant material and not lost as respiration. There are two types of plant respiration, maintenance respiration, RM, and growth respiration, RCn such that NPP = GPP - (RM + Rg). Canopy-integrated leaf respiration, R_d,c, is assumed to account for 40% of^, and ^c for 25% of NPP [Ryan, 1991].

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