Shortcomings of applying ecological footprints to the ecological assessment of regional sustainable development Principles and advances in agro-ecological service assessment Analysis of landscape change and ecological assessment of Guoluo Tibetan Autonomous Prefecture in Qinghai Province Landscape assessment on wetland degradation during thirty years in Jiansanjiang region of Sanjiang Plain, Northeast China Eco-service efficiency assessment method of urban land use:a case study of Changzhou City, China Remote sensing analysis of ecological change caused by construction of the new island city: Pingtan Comprehensive Experimental Zone, Fujian Province. The investigation and evaluation of the natural vegetation in Dongzhi Plateau, easten Guansu Province