【摘要】 为探究喀斯特山区土壤侵蚀空间分布特征,进一步探索解决土壤侵蚀造成的土地资源破坏、土壤肥力损失、质地恶化以及石漠化加剧等问题,以贵州省典型喀斯特山区绥阳县为研究区,选取ALOS影像、DEM和社会经济数据,运用人机交互解译方法提取坡度、土地利用及植被覆盖度等指标因子,以GIS空间分析探索土壤侵蚀强度的指标因子相关性、空间特征和风险性评价。结果表明:1)该研究区土壤侵蚀强度的等级面积比依次为:中度(32.35%)>强度(24.55%)>微度(21.28%)>较强度(9.28%)>轻度(6.66%)>剧烈(5.88%),中度侵蚀类型和强度侵蚀类型占主导部分;2)土壤侵蚀强度与坡度的相关系数为0.670,与植被覆盖度的相关系数为0.386,具有显著的正相关关系;3)研究区SEDI指数为423,土壤侵蚀程度达到较重等级,存在较强的潜在风险。其中,研究区东北部、东南部、东部等地SEDI指数最高,绥阳县西南部风华镇一带SEDI指数最低。该研究为预防喀斯特山区土壤退化、改善土壤环境及生态建设具有一定参考意义。更多还原

【Abstract】 In order to explore the spatial distribution characteristics of soil erosion in karst mountainous areas of southwest China, and solve the problems such as destruction of land resources, soil fertility loss, deterioration of texture and aggravation of rocky desertification, taking Suiyang County of Guizhou Province as the study area,the data on ALOS image, DEM, Socioeconomic are collected, the factors such as slope, land use vegetation coverage were extracted by human-computer interaction interpretation method, and the correlation coefficient, spatial characteristics and risk evaluation of soil erosion intensity were explored by GIS spatial analysis. The results showed that: 1) The area ratio of soil erosion intensity in the study area was: moderate(32.35%)> intensity(24.55%)> micro(21.28%)> intensity(9.28%)> mild(6.66%).2) The correlation coefficient between soil erosion intensity and slope is 0.670, and the correlation coefficient with vegetation coverage is 0.386, which has a significant positive correlation. The correlation coefficient between soil erosion intensity and slope is 0.670, and the correlation coefficient is 0.386. 3) The SEDI index of the study area is 423, and the soil erosion degree reaches the heavier grade, and there is a strong potential risk. The SEDI index was the highest in the northeastern part of the study area, the southeastern part and the eastern part of the study area, and the SEDI index was the lowest in the southwest of Suiyang County. The study has some reference significance for improving the soil environment and ecological construction in the karst mountain area.更多还原