基于RS和GIS的民勤湖区环境恶化动态分析

Dynamic Analysis of Environment Deterioration in Lake Area of Minqin by Means of Remote Sensing and GIS

以甘肃民勤湖区为典型试验区，利用遥感与ＧＩＳ技术，通过对本区１９７８ 年主航片的判读、１９９５ 年ＬａｎｄＳａｔ５ ＴＭ 图像的分类、解译和叠加分析，研究了近２０ 年来土地利用的具体变化情况，并以此为基础探讨了该区生态环境的恶化状况及原因，总结出环境恶化的发展趋势是地下水位下降、水质恶化、土地旱化、沙化、盐化、植被退化．提出走可持续发展道路是民勤湖区摆脱困境的首选途径．

By selecting the Lake area of Minqin for a typical experimental area, the dynamic changes of land degradation and environment deterioration in recent two decades were investigated by means of remote sensing and GIS. The airphoto of 1978 was worked out and the image classification of LandSat 5 TM bands of 1995 was performed; both of them were overlay analyzed, and it obtained the dynamic information of land use. The researches also contribute to know the environment deterioration such as the decline of subterranean water, the deterioration of water quality, the aridity of land, accumulation of salts in soil and the decay of vegetation,etc. So to develop water saving agriculture and facilitate other industries on a sustainable scale is the primary way to go out of the difficult position of vulnerable ecosystem in the lake area of Minqin.