论文部分内容阅读
利用ETM影像数据和GIS技术,对鄂尔多斯东胜地区进行生态功能分区。以水土流失通用方程(universal soil lossequation,USLE)理论为基础,并依据土壤侵蚀敏感性驱动力的相似性和差异性,分析了降水、土壤质地、地形和地表覆盖因子对该区域不同生态功能分区土壤侵蚀与水土流失敏感性的影响。研究结果表明:典型草原丘陵区土壤侵蚀敏感性指数SSj为4.2,典型草原平原区为4.0,典型草原沙化区为4.6,荒漠草原区土壤侵蚀敏感性指数为5.0;4个生态功能区的土地沙漠化都属于土地沙漠化高度敏感区,其由高到低的排序为荒漠草原区>典型草原沙化区=典型草原平原区>典型草原丘陵区;就土壤侵蚀程度而言,典型草原平原区属于土壤侵蚀轻度敏感区,荒漠草原区、典型草原沙化区、典型草原丘陵区属于土壤侵蚀中度敏感区。将其土壤侵蚀化程度由高到低排序:荒漠草原区>典型草原沙化区>典型草原丘陵区>典型草原平原区;就土壤盐渍化而言,典型草原丘陵区属于土地盐渍化不敏感区,其它3个区属于土地盐渍化轻度敏感区。在综合评价其土壤侵蚀敏感性区域差异基础上,阐述了鄂尔多斯东胜地区水土流失敏感性区域土地利用格局的调整与优化取向。
ETM image data and GIS technology are used to partition ecological functions in Dongsheng area of Erdos. Based on the universal soil lossequation (USLE) theory, and based on the similarities and differences of the drivers of soil erosion sensitivity, the effects of precipitation, soil texture, topography and surface coverage factors on the ecological function of the region Influence of Soil Erosion and Soil Erosion Sensitivity. The results showed that the soil erosion sensitivity index (SSj) of typical grassland hilly area was 4.2, that of the typical grassland plain area was 4.0, that of the typical grassland desertification area was 4.6, and that of the desert steppe area was 5.0. The desertification of the four ecological function areas All belong to highly sensitive areas of desertification. The descending order is desert steppe area> typical steppe sandy area = typical steppe plain area> typical steppe hilly area. For the degree of soil erosion, the typical steppe plain area belongs to the soil erosion light Sensitive area, desert steppe area, typical grassland desertification area and typical grassland hilly area belong to moderately sensitive area of soil erosion. The order of soil erosion is descending order: desert grassland> typical grassland desertification> typical grassland hilly> typical grassland plain; for soil salinization, the typical grassland hilly region is not sensitive to land salinization Area, the other three areas belong to the light salinization of the soil sensitive areas. Based on the comprehensive assessment of the regional differences in soil erosion sensitivity, the adjustment and optimization of land use patterns in the soil erosion-sensitive areas in Dongsheng area of Erdos were described.