A Research On The Environmental Impact Assessment Of The County-level General Land Use Planning Based On Landscape Ecology

Land use general planning at county level is a process of readjusting and optimizing the utilization structure and pattern of land resources, arranging major projects with large scale, long time, and wide covers, which would easily bring irreversible effects on the ecological environment after implementing. By assessing environmental impacts when compiling the planning, it helps to do imperative adjustment timely, to adopt cases of resource protection according to the evaluation results, what’s more, to take corresponding measures before and after planning implementation, and to reduce even avoid destruction of ecological environment. Based on this, to carry out environmental impact assessment of the land use general plan at county level provides theoretical significance and practical utility.Based on the analysis of domestic and overseas land use planning environmental impact assessment system and the research status, this dissertation points out the current problems of the land use planning environmental impact assessment, puts forward that the theoretical basis of land use planning environmental impact assessment should include sustainable land use theory, land use diversity theory, land use interference theory and landscape ecology theory, and discusses the relationship between landscape and land use. And then in accordance with the idea of curtain scene analysis, environmental impact assessment system of the land use general planning based on landscape ecology is constructed, replenishing and enriching the theory of environmental impact assessment.In the method of plaque density, ecological environment evaluation scores of Yixing perfecture are estimated, and the results for2005,2009,2009(natural) and2020(interference) are74.18,71.09,68.97and74.18respectively. It shows that with the implementation of general land use planning, the ecological environment quality can be maintained at good level of2005, even slightly higher than2005. Afterwards, landscape index synthetic method is utilized. Under the framework of scientifically selected landscape index system, land use layout, basic farmland layout and designated traffic land are respectively evaluated, analyzed the shortcomings of the three aspects, and the measures to increase the reliability proposed.Through theory analysis and empirical research results, it is indicated that the disadvantages in current environmental impact assessment of land use general planning at county level, such as the lack of spatiality, over macroscopic evaluation region, and over complicated calculation, could be compensated in the application of curtain scene analysis, landscape ecology methodology, and GIS software, which more intuitively shows the land use ecological environment differences among different years and provides a feasible scheme for innovation evaluation.