Abstract:Based on the 0.1°×0.1° resolution map of vegetation type,soil texture and meteorological data,the atmosphere-vegetation interaction model (AVIM2) was driven to simulate the net primary productivity (NPP) in Qilian Mountains region from 1958 to 2008,and the response of NPP to climate change were also analyzed in our paper.The results shows that:owning to the increasing of temperatures and precipitation effects,the vegetation(evergreen coniferous forest,deciduous coniferous forests,grasslands,shrubs,farmland) NPP in Qilian Mountains showed an increasing trend in total during the past 51 years,and the rate of increase were:farmland>evergreen coniferous forest>coniferous deciduous forest>grassland>shrub.Changes of vegetation NPP were positively correlated with the changes of temperature and precipitation,and the effects of temperature change on vegetation NPP is greater than that of precipitation,and temperature change effects turns out to be the dominant factors to NPP changes in Qilian Mountains.On the whole study region,the annual average temperature increased 0.043 ℃ per year,the average rate of increase in precipitation is 1.355 mm·a-1,under the combined effect of temperature and precipitation,the vegetation NPP in Qilian Mountains showed an increasing trend in total during 1958~2008,the average increase rate was 0.718 g·m-2·a-1.