基于格网单元的县级土地利用总体规划生态环境影响评价方法与应用

ASSESSMENT OF LAND USE PLANNING IMPACT ON ECOLOGICAL ENVIRONMENT AT COUNTY LEVEL BASED ON THE GRID CELL

土地利用总体规划的生态环境影响评价对于保护区域生态环境、减少土地利用总体规划对环境的负面影响具有重要的意义。以格网单元为基础,结合PSR模型和生态安全评价法,通过相关性分析筛选指标,构建评价指标体系。通过GIS空间分析,定量评价县级土地利用总体规划环境影响。以张家界市永定区为例,综合评价了规划实施前后区域生态环境的状况。评价结果表明:新一轮的土地利用总体规划后,全区生态环境状况有改善的地区占全区总面积的78.19%,说明新的规划对全区大部分地区的生态环境有积极影响。其中,水土流失指数处于安全和较安全的区域占全区总面积的60.17%,全区水土流失状况略有好转,加强水土保持工程建设仍是用永定区生态环境保护的首要任务之一。

The implementation of land use planning would have impact on the environment of the planning region. While the positive effect may optimize the regional environment, the negative one may cause serious environmental issues that seriously affect harmonious socio-economic development. Therefore,the assess ment of land use planning impact on ecological environment plays a vital role both in protecting the envi ronment and reducing the negative environmental impact of land use planning. Using PSR model and the ecological security assessment, the assessment indices were picked out based on grid cell. After screening indices through correlation analysis, an evaluation system of the land use planning on ecological environ ment impacts was constructed. Combined with spatial analysis through GIS, the environmental impact of land use planning at county level was quantitative evaluated. The proposed methods were applied in Yongding county, Hunan Province. After the analysis of the environment status and the main ecological security problems in Yongding County, which threatened the survival and development of economy and human soci- ety,the environment evaluation system of the land resource planning in this area was established. The en vironmental impacts of land use planning were assessed through comparing the environment status index and ecological security index, which are different before and after the land use planning taking effect. Results indicated that most of the area （about 78.19%） would be benefit from the performing of the new gen eral land use planning. At the same time, 60.17% of this area would be in the statues of secure and relative secure, which means a slight improvement in soil and water loss. Enhancing soil and water conserva- tion would still be one of the priorities of the ecological environment protection in Yongding County.