Changes in distribution and productivity of steppe vegetation in Inner Mongolia during 1961 to 2010:Analysis based on MaxEnt model and synthetic model

Global temperature and precipitation are undergoing unprecedented change,which has seriously affected the structure and function of steppe ecosystems in Inner Mongolia. The vegetation of this region has been suffering from severe salinization,desertification,and decline in productivity,resulting in severely ecological problems and economic losses.Although numerous studies indicate that desertification is intensifying currently,but the history of vegetation cover and geographical distribution patterns of vegetation are poorly understood. This research attempts to simulate the temporal and spatial changes in the geographical distribution of steppe vegetation based on Max Ent and changes of net primary productivity( NPP) based on synthetic model in Inner Mongolia during 1961 to 2010. The aim of this research is to provide a valuable method for predicting the potential impact of climate change on vegetation in the future. The results show that moisture index( MI),annual precipitation( P),mean temperature of the w