Abstract:
Based on RS and GIS techniques, a integrated evaluation model of eco-environment quality was developed according to Landsat TM images, soil data, DEM and meteorologic material. Eight indices were selected in the model, which were composed of vegetation type, drought index, soil texture, rainfall erosivity, etc. On the basis, the eco-environment quality of Heihe River basin is evaluated. The results show that （1）Integrated evaluation index of eco-environment quality in Heihe River basin is 5.870. The eco-environment quality at third and fourth grade occupies 68.65% of the total area. The eco-environment quality of Heihe River basin is not quite good；（2）The horizontal distribution of the eco-environment quality presents evident regional differences. The eco-environment quality is the best at the upper reaches of the river, that takes the second place in the middle reaches of the river and is the worst in the lower reaches of a river. As far as the administration is concerned, the eco-environment of Minle county, Shandan county, Ganzhou district, Qilian county and Suzhou district is good. While the eco-environment in Ejina county, Jinta county and Jiayuguan city is relatively bad.
