滇东南岩溶区土壤敏感性评价
毕业论文关键词：土壤侵蚀；滇东南；岩溶区；敏感性评价；
Abstract
In the human and natural forces, soil and ground substance is deposited, erosion, a separate process known as soil erosion, Renard KG presented the soil erosion equation A = R * K * LS * C, A is the amount of soil erosion, on behalf of the total soil erosion, R is rainfall erosivity, rainy deposition on land, so land erosion, K is the soil texture factor, is due to the impact of differences in soil erosion occurs on soil texture, LS is the slope slope factor, that is, the extent of undulating terrain, elevation of soil erosion is to a certain extent, C is the land cover factor, is the ground cover plants, water, soil erosion and other overlay also have a significant impact, P is agricultural measures (arable) factor is the impact of human factors on human activity, changes in the larger, is not discussed. Now in southeastern Yunnan karst region as the main research object for the study ArcGIS platform, select land cover factor (C), slope and aspect factor (LS), soil texture factor (K) as the main basis for the standard soil erosion, first separately These three factors will be analyzed and taken into account these factors, soil erosion assessment results in the region, and finally found a mild sensitive, moderately sensitive, highly sensitive to these three categories account for most of the study area, and ratio is not sensitive and extremely sensitive account for very little.
Key words：soil erosion; Southeast Yunnan; karst area: Sensitivity evaluation;
目录
摘 要 I
Abstract II
1 绪 论 1
1.1国内外研究现状 1
2滇东南岩溶区敏感性评价 2
2.1 研究区概况 2
2.1.1 地理位置与人口分布 2
2.1.2 气候水文与作物 2
2.1.3 地质与生态环境 2
2.2 研究方法概述 3
2.3 评价结果 4
2.3.1 坡度坡向因子 4
2.3.2 地表覆盖因子 7
2.3.3 土壤质地因子 10
2.3.4 土壤侵蚀敏感性综合评价 12
3 滇东南岩溶区土壤敏感性 14
3.1 坡度坡向因子敏感性分析 14
3.2 地表覆盖因子敏感性分析 15
3.3 土壤质地敏感性分析 15
4 结论与讨论 16
5 建议 16
致 谢 17
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