摘要
泻溜侵蚀是黄土高原一种严重的土壤侵蚀方式,它是高含粘量地层因粘土矿物的强烈吸水膨胀而引起的地质现象。在一个流域里,泻溜面的分布数量和规模,随侵蚀沟不同发育阶段内在侵蚀力的变化而变化,主要发生于中游以上地区,愈向下游分布愈少。支沟中泻溜的分布状况与主沟分布状况十分相似。河谷阶段的沟谷,泻溜分布于河谷阶地下红层露头处和沿新谷坡发育起来的短小切沟中,切沟阶段沟谷的泻溜面沿沟床两侧条状分布。防治泻溜侵蚀,最关键的是要稳定坡脚和沟床。只有当泻积物在坡面堆积创造了条件后再在泻溜面上种草、造林,才会收到好的治理效果。
Slumping erosion,a severe form of soil erosion on the loess plateau, is a geological phenomenon which results from swelling of high-clay stratum due to drastic absorbtion of water. In a watershed,distribution of slumping amount and scale varies with internal erosion force in different stages of gully development,take place mostly on upper and middle reaches and less on lower reaches of a gully.The distribution in tributary gullies is quite similar to that in main gullies. In gullies in stage of cutting down,the slumping surfaces are distributed in stripe along both sides of the gully bed. It is vital to stabilize root of slopes and the bed of gullies in order to avoid slumping. Only plants vegetables after slumping materials piled up,can effectives be achieved.
出处
《中国水土保持》
北大核心
1989年第9期33-35,共3页
Soil and Water Conservation in China
