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一、沟壑侵蚀的现状 朝阳地区的丘陵山区,包括石质山区、低山丘陵区和黄土丘陵区,各区沟壑纵横。全区现有沟壑河滩面积321.1万亩,沟壑密度一般在3公里/平方公里以上,沟壑侵蚀比较严重。主要侵蚀形式有以下几种: (一)浅沟。浅沟侵蚀在初期完全和细沟侵蚀相同,后期一般深0.5～1.0米,宽1.0米左右,横断面呈扁平形,正常的耕犁不能平复。在低山丘陵和黄土丘陵区的坡度较缓(5°～15°)、坡面较长的坡耕地上表现明显。在石质山区的山脚台地上或较大流域的沿河阶地上,因坡氏较短和坡耕地上部有较大面积的荒山集雨区,浅沟状态存在时间较短,很快便形成切沟侵蚀。
First, the current situation of gully erosion Chaoyang area hilly mountains, including stony mountains, hilly areas and loess hilly areas, ravines all over the area. The existing gully beach area of 321.1 acres of gully, gully density is generally above 3 km / km2, gully erosion is more serious. The main forms of erosion are the following: (A) Shallow ditch. Shallow ditch erosion is completely same with rill erosion in the early stage, generally 0.5-1.0 m deep and 1.0 m wide in late period. The cross section is flat and the normal plow can not be recovered. In the hilly and loess hilly areas of the slope is relatively slow (5 ° ~ 15 °), the slopes of a long slope of the obvious performance. In the stalagmite mountainous terraces or on the riverside terraces of larger watersheds, because of the shorter slope and the large area of barren mountain catchment above the sloping arable land, the state of shallow ditch existed for a short time, Groove erosion.