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以三峡地区的乐天溪流域为例,利用多时相LandsatTM/ETM影像、文献和野外调查资料研究了替代能源对流域土地利用和土壤侵蚀的影响。通过几年替代能源措施实施,乐天溪流域林草覆盖率由1997年的80.6%增加到2002年的83.2%;不仅林草覆盖率增长,而且质量也有较大提高,覆盖度较高的林地和灌丛面积增幅达18.1%和9.1%,相反疏林面积减少37.9%。强度、中度和轻度侵蚀面积分别减少了4.6km2、26.4km2和11.5km2;流域的土壤侵蚀总量由507259t减至371592t,减少26.8%;流域的平均侵蚀模数由1241t/km2减至909t/km2。
Taking Lotten Stream watershed in the Three Gorges area for example, the impacts of alternative energy sources on land use and soil erosion were studied using multi-temporal LandsatTM / ETM images, literature and field survey data. After several years of implementation of alternative energy measures, the forest and grass coverage in Lotte Stream watershed increased from 80.6% in 1997 to 83.2% in 2002; not only did the forest and grass coverage increase but also the quality was substantially improved and the coverage of forest land and The area of shrublands increased by 18.1% and 9.1%, whereas the sparse forest area decreased by 37.9%. The area of intensity, moderate and mild erosion decreased 4.6km2, 26.4km2 and 11.5km2 respectively; the total amount of soil erosion decreased from 507259t to 371592t, decreased by 26.8%; the average erosion modulus decreased from 1241t / km2 to 909t / km2.