中文摘要：

为了探讨福建省长汀水土流失严重的原因,选取地形因子中的高程和坡度,结合“3S”的空间分析技术,对根溪河小流域的水土流失现状进行分析.研究表明：流域内海拔为300～350m所占的面积最大,比例为34.06%,而坡度在25～35°之间的面积最大,占总面积的27.27%;海拔在300～400m之间,因人类活动频繁而又缺乏合理规划与保护措施,导致此区域内成为水土流失分布最广和最严重的地带,而坡度为15～20°的土壤侵蚀率最高.

英文摘要：

Changting County is the region most seriously affected by soil and water loss in Fujian. The status quo is analysed by using the technology of ＂3S＂ in the tiny watershed of Genxi River, focusing on land slopes and elevations. The result shows that the land mostly affected is mainly distributed on the slope between 25-35 °and on the elevation of 300-350 m. The largest and most serious soil and water loss area is distributed on the elevation of 300-400 m, caused by human beings＂ frequent actions, lack of scientific design and rationall preservation measures, whereas the rate of soil erosion is the highest in the area on the slope of 15-20 °.