【摘要】 通过对ＴＭ图像的线性纹理提取和密度统计，首先获得了黄土丘陵区沟谷密度图，然后由沟谷密度反演区域土壤侵蚀强度。这种方法避开了影响土壤侵蚀量的诸多复杂因子。可直接从水土流失的外在表现———沟谷密度来反推土壤侵蚀强度。研究结果证明，这种方法对快速调查大范围黄土丘陵区的土壤侵蚀强度是十分有效的更多还原

【Abstract】 Thick gullies are the results of soil erosion in the loess hill area. On the contrary, gully density could also embody the intensity of soil erosin. Linear extraction technique and a density statistical software have been developed to make a gully density map directly from TM image. By building a regression function between gully density and soil erosion intensity, the gully density map can be transfered to soil erosion intensity map. This method is very suitable for quick investigation of soil erosion in the extensive loess area.更多还原