Abstract: Watershed management information system is integrated with multiple themes of watershed information, and becomes a tool of watershed comprehensive management. Based on GIS technology, this paper developed a management information system for Xilin River Basin, which had the functions of data management, query, updating, displaying, output, and model analysis operated at pixel level, and contained three models, i.e., water quality assessment, watershed analysis, and irrigation requirement. Based on remote sensing images, the water quality assessment model realized real time monitoring and estimation of water quality evaluation indices, and, by using logistic regression to calculate the coefficients, could predict the water quality in the future. The watershed analysis model could define flow direction, estimate flow accumulation, and delineate watershed; and the irrigation requirement model could calculate the demands of irrigation under current rainfall condition. Therefore, this watershed management information system could provide valuable information for watershed modern scientific management.

Key words: Hydrophyte, Iron plaque, Nutritional elements, Heavy metal elements