R&D of Comprehensive Evaluation System of Ecological Environment in Tarim River Basin

Comprehensive ecological environment evaluation system is an essential professional analysis system in Tarim River basin water regulation management. Research and development of the system consists of ecological environment quality evaluation module, ecological risk assessment module and ecological water demand module. The paper carries out environment quality evaluation by calculating bio-abundance index, vegetation coverage index, density index of network of rivers, land degradation index and pollution load index, and adopts "plant phreatic evaporation quota method" to calculate demand for ecological water in maintaining current situations of natural vegetation. By ecological risk evaluation thought and landscape ecology method, the paper makes calculation of ecological degradation index, risk index and restoration index respectively, and builds an ecological risk intensity index for corresponding ecological risk analysis and evaluation. It further explores the overall plan for system building, system function and structure and integration with other subsystems. Results show that it is very practical and operable to develop environmental information system with the theoretical study results and through ArcGIS +Oracle9 i + ArcSDE technology, and the development helps to make scientific evaluation on environment in arid area, and can offer certain reference for development of other relevant systems.