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Changes of agroecosystem services value under effects of land consolidation. Economic cost-benefit analysis of environmental impact of hydropower development projects: A case study in the middle and lower reaches of the Nu River, China Method to decide ecological barycenter and ecological security analysis on the issue of moving the capital to another place in China The comparison on economic values of ecosystem services for greenhouse agriculture of different climatic regions in China：two case studies from Northern China and the Middle and Lower Reaches of Yangtze River Spatial targeting of payments for ecosystem services Based on SWAT Model and cost-benefit analysis AN UPGRADE PRACTICE OF A DOUBLE-RACK SOURCE 60Co IRRADIATOR