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随着鄱阳湖流域开发进程加快,土地利用类型势必发生转移,从而对鄱阳湖流域的生态环境产生影响。为了能反映鄱阳湖流域由于土地利用变化对土壤侵蚀的影响效应,本文通过采用3S技术手段,获取鄱阳湖流域土地利用空间数据与土壤侵蚀数据,引入土地利用变化转移矩阵指数和土壤侵蚀强度指数,对鄱阳湖流域土地利用变化和土壤侵蚀效应空间关系进行定量分析。结果表明:①1985年～2000年间,影响鄱阳湖流域土壤侵蚀强度变化的土地类型主要集中在农田、林地和草地,而水域、工矿居民用地与未利用地三种土地类型对土壤侵蚀强度变化总体变化不大;②加重土壤侵蚀强度的主要是林地转化为农田、林地转化为草地、草地转化为农田;而土地利用类型农田转化为林地、林地内部之间的转化减轻了侵蚀强度。土地利用类型和土壤侵蚀强度之间的定量研究结果反映了土壤侵蚀效应的变化,与鄱阳湖流域的水土流失现实情况一致。
With the accelerated development of Poyang Lake Basin, land use types will inevitably shift, which will affect the ecological environment of Poyang Lake Basin. In order to reflect the effect of land use change on soil erosion in Poyang Lake Basin, spatial data and soil erosion data of Poyang Lake Basin are obtained through the use of 3S techniques. The index of land use change matrix and soil erosion intensity index are introduced, The spatial relationship between land use change and soil erosion in Poyang Lake Basin was quantitatively analyzed. The results showed that: ①The types of land that affected the changes of soil erosion intensity in Poyang Lake Basin mainly concentrated in farmland, woodland and grassland from 1985 to 2000. However, the changes of soil erosion intensity in three types of land, non-use area, ; ② increase the intensity of soil erosion is mainly converted into farmland of woodland, woodland into grassland, grassland into farmland; and land-use type of farmland into woodland, woodlands within the transformation to reduce the erosion intensity. Quantitative results between land use types and soil erosion intensity reflect changes in soil erosion effects, consistent with the reality of soil erosion in Poyang Lake Basin.