Ecosystem service trade-offs in the Guanzhong-Tianshui economic region of China Spatial-temporal distribution of the ecological service value and NPP of cultivated land on Longdong Loess Plateau Effects of Land Use Change on Environment in Agro-pastoral Ecotone Based on Ecosystem Services Value:A case study in Taipusi, Inner Mongolia Spatial distribution and changes of ecological service value of land use in the southern suburb of Datong City Land use change and its effects on ecosystem services value in Ji’nan City of Shandong Province, East China. Features of grassland resources and their classified management in Alatai region of Xinjiang Methods of land carrying capacity research based on ecological services supply value in Yunnan Dynamics of cropland resources value in fragile ecological zones of the loess hilly-gully region: A case study of Shanghuang Experiment Area