Plant net primary production (NPP) of agriculture vegetation represents the capacity of sequestrating atmospheric CO2 in agro-ecosystem, and plays an important role in terrestrial carbon cycling. In comparison with natural ecosystems of forest and grassland, agro-ecosystem is much complex due to human being activities. To batter understand the contribution of agro-ecosystem to regional carbon budget, the simulation models of crop NPP have been developed well since 1970s. However, few models are successfully...