康保县土地利用与土壤侵蚀关系研究(2)
2013-06-27 01:18
导读：issued by the Ministry of Water Resources, refer to indicators of soil erosion intensity classification put forward by the scholars, the classification and grading soil erosion intensity index system
issued by the Ministry of Water Resources, refer to indicators of soil erosion intensity classification put forward by the scholars, the classification and grading soil erosion intensity index system of the study area is built. and then the use of GIS and RS technology, extracting the status quo of land use, slope, vegetation coverage, soil texture and other information, and soil erosion intensity index system of classification and grading information will be superimposed to get graded intensity classification maps of all areas of soil erosion in northern Hebei , and further land use maps and soil erosion intensity map will be superimposed to obtain soil erosion map of different types of land-use, to explore the relationship between land-use change and soil erosion.The main contents include:(1) First of all, this paper will expound the concept of soil erosion and land use , meaning of the study, research progress and RS, GIS technology in this area.(2) By applying remote sensing and geographic information systems technology, using multiple sources of information, extracting the required number of indicators of soil erosion intensity classification and grading, based on data of land use in the study, on the combination of topography, vegetation, soil erosion, degree of slope, soil texture, rainfall and other natural effects of factors, to build a spatial pattern of land use of Kangbao County.(3) Based on the existing (2000) Kangbao County land use data, applying remote sensing data in 2005 from the combination of remote sensing and geographic information systems technology to make land use maps in 2005.Studies have shown that land degradation of the study area is a very serious. The land with Different intensity of soil erosion has different land-use characteristics. Soil erosion of the study area is moderate mainly, making up 34.59% of the total land area; followed by mild erosion, making up29.59% of the total land area. With the erosion intensity increases, soil erosion area will reduce rapidly.Northern Hilly areas, eastern gentle hilly area and central southern gentle wavy plain areas have different regional extent of soil erosion. Northern Hilly areas has main moderate erosion, the total land area of 39.59 percent, followed by mild erosion, of the total land area of 34.68%; eastern gentle hilly area exists mild erosion, mainly of the total land area of 41.52%, followed by moderate erosion, the total land area of 35.44%; Central southern gentle wavy plain areas has moderate and minor erosion mainly, of the total land area of 27.01%, 25.22%. Gentle slope erosion in eastern hilly region makes the highest proportion of affected land, land erosion intensity in the mild and more , of the total land area of 92.17%; the northern hilly area of soil erosion intensity, moderate intensity and above, the area of land erosion accounts for the total land area of 52.55%.Kangbao County Land Use different degree of soil erosion of arable land is the most serious, above moderate degree; the erosion of forest land is also more serious, mainly in more than mild degree; grassland erosion is relatively small, mainly in less than mild. However, serious pasture degradation indicates that the grass is eroded more seriously. Grassland is China's major land use types in farming-pastoral zone, and its serious soil erosion has a negative impact on the regional ecological environment. Unused land for slightly erosion accounted for more than 73.43 percent; this shows that Kangbao County land use for slightly erosion control has not been effective.
【中文关键词】 康保县; 土地利用; 土壤侵蚀; 遥感
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【英文关键词】 Kangbao County; land use; soil erosion; remote sensing
【毕业论文目录】
摘要 6-8
Abstract 8-9
第一章 绪论 10-18
1.1 选题背景及研究意义 10-12
1.2 国内外土壤侵蚀评价研究进展 12-16
1.2.1 土壤侵蚀相关概念 12-14
1.2.2 国内土壤侵蚀评价研究进展 14-15
1.2.3 国外土壤侵蚀评价研究进展 15-16
