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采用RS/GIS技术,研究东江源区1995-2000年的土地利用变化和土壤侵蚀强度变化的关系。结果表明:1)东江源区土壤侵蚀面积有所增加,强度降低;2)土壤侵蚀强度变化主要发生在林地、草地、耕地这3种土地利用方式中,其中林地土壤侵蚀强度有较为明显的增加;3)加重土壤侵蚀强度主要是林地转变为草地和耕地,而耕地向林地、林地内部之间的转化减弱了侵蚀强度。研究表明,土地利用变化是土壤侵蚀的主导因素,尤其是林地、草地和耕地之间的转化对土壤侵蚀强度的变化影响很大。其中,耕地向林地、林地内部之间的转化将对土壤侵蚀强度起到减弱效果,而林地向草地、耕地之间的转化则会加速土壤侵蚀的恶化。
Using RS / GIS technology, the relationship between land use change and soil erosion intensity in Dongjiang source area during 1995-2000 was studied. The results showed that: 1) the area of soil erosion in Dongjiang source area increased and the intensity decreased; 2) the change of soil erosion mainly occurred in three land use types of forest land, grassland and cultivated land, in which the soil erosion intensity of forest land increased obviously ; 3) aggravating the intensity of soil erosion is mainly the conversion of woodland into grassland and cultivated land, while the conversion of arable land to forestland and woodland weakened the erosion intensity. Studies have shown that land use change is the dominant factor of soil erosion, especially the conversion of forest land, grassland and cultivated land has great influence on the change of soil erosion intensity. Among them, the conversion of arable land to woodland and woodland will have a weaker effect on the soil erosion intensity, while the conversion of woodland to grassland and arable land will accelerate the deterioration of soil erosion.