干旱区生态环境知识资源中心

It is a complex ecological structure with grassland, forest and agriculture in arid and semi-arid regions in Northwest China. It is important for understanding and evaluating ecological efficiency to study net primary productivity of vegetation in Northwest China. In this paper, Gansu Province was selected in Northwest China to study vegetation NPP based on adjusted boreal ecosystem productivity simulator (A-BEPS) model in arid and semi-arid regions. Net primary productivity of vegetation was simulated in Gansu Province from the year of 2002 to 2010 with moderate resolution remote sensing imageries and meteorological data. And then, spatial-temporal distribution patterns of average NPP were analyzed in Gansu Province from the year of 2002 to 2010. The results show that it is high in the south and low in the north for spatial distribution, and obviously seasonal characteristics are got in Gansu Province. Finally, the trends of averaged NPP for three vegetation types and relative meteorological factors were analyzed for the past nine years. The results of a little decreasing NPP and precipitation are got for Gansu province.