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Abstract: Biomass accumulation is related to various climate factors, especially heat and water. In this study,
we have attempted to improve a statistic model evaluating aboveground net production (ANP) of different types
of grassland in China. The ground truth data taken in 1995 were used for comparison of our improved model
with a prototype one developed by former researchers. We found that the improved model obviously reduced
systematic errors which were seen in the prototype model. Using our improved model, we evaluated the
geographical distribution of grassland ANP in northern China. Then, we attempted to evaluate the impact of
climate change on grassland ANP for given scenarios, the output of GCMs, such as HadCM2 and ECHAM4, by
using the improved model. The result indicated that ANP might increase in both 2030 and 2056 for most types
of temperate grassland for the given climate scenarios. The change rates of productivity of eleven grasslands
might increase by 1.22% up to 10.24% in 2030, and 1.61% up to 15.8% in 2056, depending on their types.