Evaluation On Ecosystem Services Value Of The River Network Of Yan Yun Irrigation District Based On GIS

The typical impress of plain river network include land fertile,densely populated and developed industrial and agricultural economic.As a special ecological resources of the region,water not only provides the basic resource to human life and production activities, but also has the functions that keeping the structure of natural ecosystems, ecological processes and the regional ecological environment. With the economic growth and people's lack of ecological protection, the function value of ecosystem services of river plains would be serious recession.The research about function value of ecosystem services must be stated for the scientific assessment of the actual situation of the ecosystem.Based on the theory of function value of ecosystem services and consulting the existing results of function value of ecosystem services at home and abroad,the index system of the function value of ecosystem services has been established with characteristic of plain river network,and research the all design procedures of the function value of ecosystem services;Using the visual basic bisualization tools,the MapInfo and its subassembly MapX,the evalution system about the theory of function value of ecosystem services of plain river network has been established based on GIS.Then use the design procedures and evaluation system to the Yan Yun plain river network which is in Jiang Su city.Based on the datebase from 2003 to 2007,the evaluation for provision of water,marine product,inland shipping,water regulation, purification of water bodies,regulation of atmospheric composition, cleaning up the environment have been completed and analyze the trends of the function value of ecosystem services in every year.The combination of GIS and the function value of ecosystem services could be in favor of efficient dealing with the mass data of the function value of ecosystem services.The results show that this system have some traits:Easy to operate,fast and user-friendly,and could meet the requirements of system schedule.The index system ,design procedures and the function value of ecosystem services for plain river network could been appliced to China Southern and have the significance for the Scientific decision-making of the function value of ecosystem services.