废黄河沙土区土壤侵蚀量分析

Soil Erosion from Disused Sandy Soil Districts of the Yellow River

废黄河沙土区是水土流失比较严重地区,通过对废黄河上、中、下游3个典型地带径流小区2006年观测资料的统计分析,获得废黄河沙土区不同下垫面坡面条件下的土壤侵蚀状况。结果分析表明,一般农地土壤年侵蚀量在1191～2714t/km2之间;林地在550～1157t/km2;沟坡在7779～8658t/km2(坡度17°～22°)。其中,农地受人工扰动后的土壤年侵蚀量约为未扰动农地侵蚀量的2～4倍。

The disused sandy soil districts of the Yellow River suffer comparatively serious soil and water loss. The result of soil erosion in different underlying surfaces and slope surfaces is obtained through the 2006＇s observation from the experimental station of soil and water loss. According to the statistical data of 2006＂s observation from the three runoff plots in upstream, middle-stream, and low-stream of the disused districts of the Yellow River, the soil erosion module from ordinary farmland is found to be 1 191-2 714 t/km^2 per year; from forestland, 550-1 157 t/km^2 per year; and from gully-slope land, 7 779-8 658 t/km^2 per year （for slope degree between 17° and 22°）. The soil erosion module from artificial disturbed farmland is 2 to 4 times that from undisturbed farmland.