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基于RS和GIS技术,从土壤侵蚀、土地利用和地质灾害3个方面出发,选取土地覆盖类型、高程、地质灾害、土壤侵蚀和坡度等5个因子,基于AHP确定因子权重,借助于ArcGIS的空间叠加分析,通过多因子叠加计算完成研究区水土流失敏感的综合评价,并探究其空间分布格局。研究结果表明:4个敏感级的面积比分别为15.20%,50.00%,20.45%和14.35%,其中,极敏感区的面积比例最小,低敏感区面积的最大;不敏感区主要分布在城市化进程相对较快的区域;低敏感区主要分布在研究区中部的丘陵地带和北部沿江河谷平原区,敏感区主要分布于南部和西南部的前山和深丘地区,极敏感区集中分布南部山区;在地域分异规律上,敏感程度由北向南逐渐递增。该结果可为区域水土保持规划的制定和生态环境的建设提供重要的科学依据和技术支撑。
Based on RS and GIS technologies, from five aspects of soil erosion, land use and geological disasters, five factors including land cover types, elevation, geological disasters, soil erosion and slope were selected. The weight of factors was determined based on AHP. By superposition analysis, the comprehensive evaluation of soil erosion sensitivity in the study area is completed through multi-factor superposition calculation, and the spatial distribution pattern is explored. The results showed that the area ratios of the four sensitive levels were 15.20%, 50.00%, 20.45% and 14.35% respectively. Among them, the area proportion of extremely sensitive area was the smallest and the area of low sensitive area was the largest. The insensitive areas were mainly distributed in urbanization The sensitive areas are mainly distributed in the hilly areas in the central part of the study area and the plains area in the north along the river valley. The sensitive areas are mainly distributed in the front hills and deep hills in the south and southwest. The most sensitive areas are concentrated in the southern mountains. In the law of geographical differentiation, the degree of sensitivity gradually increases from north to south. The results can provide important scientific basis and technical support for the formulation of regional soil and water conservation planning and the construction of ecological environment.