The construction and application of an agricultural ecological-economic system coupled process model Ecosystem service value of restored secondary forest in the Karstic-rocky hills —A case study of Nongla National Medicine Nature Reserve,Guangxi Zhuang Autonomous Region Ecological-economic coupling process and sustainability for ecological rehabilitation of Xiannangou Catchment in the Loess Hilly Region GIS-based study on the ecological-economic regionalization of Yunyang County in Three Gorges reservoir area The effect of spatial scales on wetland functions evaluation: a case study for coastal wetlands in Yancheng, Jiangshu Province Ecological-economic coupling effects of transforming slope farmland to terraces in the hilly-gully region of Loess Plateau Research on three small-scale agricultural ecological-economic systems in Shenzhen City based on emergy analysis