基于多源數(shù)據(jù)的喀斯特山區(qū)石漠化評價地理單元劃分研究
[Abstract]:Rocky desertification not only affects the living environment of human beings, but also restricts the economic development of the region. As a serious disaster area of rocky desertification in southwest China, experts and scholars concerned have carried out a lot of research for many years, and have made a great deal of research achievements in evaluation and comprehensive control of rocky desertification. In the evaluation unit of rocky desertification, the current research is limited to administrative regions and grids. In order to better evaluate the rocky desertification, this paper takes Guanling County, which is a relatively serious rocky desertification area in southwest China, as the research area. Taking the division of geographic units for evaluation of rocky desertification as the main line, using the main techniques of "3s", AHP, comparative analysis, object-oriented classification, etc., the paper carries out the object-oriented high-precision land use data extraction in karst mountain areas. The spatial cluster analysis based on multi-factor coupling relationship is developed to analyze the relationship among land use data, lithology data, rainfall data and slope data, and to divide the geographic unit of evaluation of rocky desertification. The main research contents and conclusions are as follows: (1) based on high resolution remote sensing image, the data of land use status in the study area are extracted by using object oriented classification method. Through field verification and analysis, the extraction accuracy reaches 86.6949. (2) Analytic hierarchy process (AHP) is used. The corresponding hierarchical structure model is constructed for each related unit, and the feasibility of the model is judged by analyzing the relationship between two and two factors through the judgment matrix. Spatial clustering analysis based on multi-factor coupling relationship is carried out. (3) the geographic units of rocky desertification evaluation in the study area are mainly divided into related units and uncorrelated units, and the related units are further divided based on land use and scoring range. Based on land use, the study area is divided into forest land unit division, grassland unit division, dryland unit division, garden unit division and bare land unit division. Based on the evaluation unit index of rocky desertification, it is divided into one to five grades. (4) the evaluation results show that the degree of rocky desertification in Guanling County is mainly light and moderate rocky desertification, and its distribution is wide. Concentrated in the west of Guanling County.
【學位授予單位】:貴州師范大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:X171
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