| Hydropower project is a major human engineering activity, its construction will have a profound impact on land ecological environment, Hydropower industry is one of the pillar industries in yunnan province。 Yunnan province has planned 50 large hydropower station on the six major drainage river mainstream at present. In addition to this, More than 216 small and medium-sized hydropower stations under construction and planning to construction. The land ecological environment must be destroyed with the construction of the hydropower station, in order to keep the sustainable utilization of large and medium-sized hydropower stations which are under construction and planning to construction, as well as to provide guidance on the basis of theory and practice. This paper takes Manwan hydropower station as an example. From the perspective of land ecology, this paper take the land ecological environment as a complete system, using six times between 1990 and 2014 TM images, the first and the second national land survey data, soil census data, geological disaster data and the social and economic data, comprehensive analysis the land ecological environment effect of Manwan hydropower plant and its surrounding before and after completion with ENVI, MAPGIS, AUTOCAD and ARCGIS. The analysis about the land ecological environment effect mainly from seven aspects in this paper:the LUCC of the study area, the change of climatope, the change of biological environmental, the change of soil quality, the change of water resources, the situation of geological hazards and the change of social and economic about county which involved in the study area. At the end, the paper analysis superposed the factors of the land ecological environment, and zoning study area by land ecological stability using superposition results. The whole research area can be divided into land ecological damage area, land ecological potential threat area, land ecological stable area and land ecological safety area these four types of area, and for different regions, different protection measures are put forward. This result provides the basis for the research area land ecological environment sustainable control. |
