RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2007, Vol. 16 >> Issue (4): 494-494.

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GRID BASED SPATIAL EVALUATION OF ECO ENVIRONMENTAL CONDITION OF TAIHU LAKE

LIU Yunxia\+\{1,2\},CHEN Shuang\+\{1*\},PENG Lihua\+\{1,2\},FAN Chengxin\+1   

  • Received:1900-01-01 Revised:1900-01-01 Online:2007-07-21

Abstract:

With the grid spatial analysis technique of GIS，the multifactor synthetic evaluation of ecoenvironmental condition was carried out for the whole Taihu Lake，and the spatial distribution internality of ecoenvironmental condition was posted. Firstly，the whole lake was divided into 800 grid cells，and based on the data of 11 factors—including water, organism and sediment—monitored at limited points from 2002 to 2003, the simulative value of all cells was obtained by spatial interpolation by the use of GIS. Secondly，the factor values were combined into a synthetic value for each cell by grid overlay calculation by GIS. By the synthetic value，the cells were divided into five levels including best，better，fair，worse and worst，and the evaluation map of the ecoenvironmental condition of Taihu Lake was obtained. The results showed that the ecoenvironmental quality decreased from southeast to northwest gradually，the area of worse level and worst level accounted for a majority of the lake，and the ecoenvironmental status is poor in general. It was also indicated that the study evaluated the ecoenvironmental quality of Taihu Lake objectively for the results accorded basically with the actual status of the lake.

Key words: Taihu Lake, grid, spatial evaluation of ecoenviroment, GIS, Analytic Hierarchy Process(

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