Net Primary Production (gC/sq.m/yr)

Net primary production (NPP) is GPP minus autotrophic respiration (Ra). NPP = GPP – Ra In the version of NPP and Ra was assumed to be 0.5 GPP. A more elaborate calculation of Ra is under development by CSIR.净初级生产力（Net Primary Production, NPP）为总初级生产力（Gross Primary Production, GPP）与自养呼吸（autotrophic respiration, Ra）的差值，计算公式为NPP = GPP – Ra。在该版本的计算中，NPP与Ra均被假定为GPP的0.5倍。目前CSIR正在开发一种更为精细的Ra计算方法。