Abstract: System  for identifying and zoning ecosystem services (SIZES) a software tool for automatically identifying and delimitating the zoning boundaries of ecosystem services divisions, which can identify the spatial heterogeneity of ecosystem services and give guidance to the regional ecosystem management. SIZES integrates multi-source data, and then, identifies the kernel ecosystem services and delimitates the boundaries of ecosystem services by factor analysis and spatial fuzzy clustering analysis after hierarchically inputting relevant indicators. A case study on the application of SIZES in Poyang Lake area showed that the ten ecological zones delimitated by the system explained the spatial heterogeneity of ecosystem services of the study area, being helpful to provide valuable spatial and temporal decisionmaking information for the local ecosystem services management.

Key words: Grassland ecosystem, Nitrogen mineralization, Soil, Factors