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在坡面股流的流程上,当径流侵蚀力增大到足以冲刷土块,形成小跌水,进而演化为细沟下切沟头时,细沟侵蚀就开始发生了。下切沟头的下切侵蚀和下切沟头间径流对沟底的冲刷、沟头的溯源侵蚀、沟壁的崩塌形成了断续细沟。而一条股流的流程上多个断续细沟溯源侵蚀的连接,就形成了连续细沟。在这个过程中,由于降雨径流侵蚀力和土壤抗侵蚀力在时空上的强弱对比关系,出现细沟的分叉、合并及连通现象。所有这些过程,不但进一步促进了细沟的发展,而且随之造成严重的细沟侵蚀。夏休闲地的免耕留茬,秸秆覆盖,水平沟种植,草粮带状间作,陡坡地的退耕还林、还草,是防治细沟侵蚀的有效措施。
In the process of slope flow, rill erosion begins when runoff erosive force is increased enough to scour the soil mass and form small plunge and then evolve into the lower ditches. Undercut cutting undercutting erosion and undercutting runoff between the erosion of the ditch at the bottom of the trench, the head of erosion, trench wall collapse formed intermittent Rill. The process of a stream of multiple intermittent rill trace erosion connection, formed a continuous thin groove. In this process, the bifurcation, merging and connectivity of the rill appear due to the temporal-spatial correlation between the rainfall runoff erosivity and the soil erosion resistance. All of these processes not only further promote the development of the gutter, but also cause serious erosion of the rill. Summer fallow no-tillage stubble, straw mulching, horizontal ditch planting, grass strip intercropping, steep slope of returning farmland to forest, grassland, is an effective measure to control rill erosion.