The Research On Ecological Influence Domain Measurement Of Lakes

There are numerous lakes in our country. The problems of lake basin pollution and ecological degradation are quite common, which leads to an urgent need to academic circles to put forward some valuable ideas of management from different point of view. In the composite system of "lake-basin", lake, as a catchment center of basin, has superior habitat, rich species, and strong ecological service function, which is one of the important starting point of various ecological processes in the basin and the spillover base of ecological function, exerting a strong influence on ecological environment. Based on that mentioned before, using the concept of "field" in physics and considering the scale of lakes, space distance, medium types and other factors, this study improves the traditional field intensity model and establishes an ecological impact domain measurement model of lake. By using the model to measure the ecological influence domain of four major lakes in erhai lake basin of Yunnan province quantitatively, and then this study visualizes the outline of different ranks. The findings show that the ecological influence domain of the largest lake in the basin (Erhailake) takes a proportion of 99.3093% in the total area of river basin, which has an overwhelming advantage over other three lakes. According to the impact strength (field), the ecological influence domain of Erhai lake is divided into three types— high, medium and low, corresponding propotion accounting for 17.27%,22.95%,59.78%.Construction of ecological civilization is an important measure of basin comprehensive treatment. According to the spatial pattern characteristics of influence domain, this study formulates the corresponding implement path of ecological civilization construction, which can improve governance performance of basin ecology. According to characteristics of natural, human geography in each region, high influence domain in Erhai lake should pay more attention to construction of clean rural village, ecological tourism, ecological restoration and conservation of soil and water; while the medium influence domain should focus on water conservation of Cangshan mountain and conservation function of soil and water, and strives to build cross-sectional purification with storage of Eighteen creek; as to the low influence domain, it should adjust industrial structure of agriculture comprehensively, control non-point source pollution of agriculture, and promote the development of circular economy of agriculture. As to the Erhailake, the area of influence domain of the other three lakes are very small. Thus, priority should be taken to restore and protect the wetland of lake, and maintain the contact channel of material, energy and function with the outside environment.This study provides referential basis for the ecological management of lake basin for the Erhai lake basin in Yunnan province and the other similar lakes in China. And to a certain extent, this study enriches and develops the theory, technology and method system of ecology and geography, which has important practical value and scientific significance.