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通过紫色土上植被自然恢复过程3个阶段的研究,总结了遂宁组紫色土的母质侵蚀规律,结果表明:①研究区符合降雨—植被—侵蚀耦合的Langbein和Schumm关系,植被恢复对母质侵蚀起到了明显的控制作用,第2阶段比第1阶段径流减少12.06%,侵蚀减少35.81%;第3阶段比第1阶段径流减少39.61%,侵蚀减少83.46%;②影响径流与侵蚀的各个因子中,降雨量是影响最大的因子,并且随着植被自然恢复进程,其他因子的影响作用也逐渐发生变化;③随着植被的逐步恢复,对于径流和侵蚀的控制作用逐步增强,产生地表径流的临界降雨量由第1阶段的13.70mm,上升到第2阶段的16.21mm,第3阶段已经上升到21.14mm.
Through the study of three stages of natural restoration of vegetation on purple soil, the parental erosion patterns of purple soil in Suining Formation are summarized. The results show that: ①The study area is in accordance with Langbein and Schumm coupling of rainfall-vegetation-erosion coupling, In the third stage, the runoff decreased by 39.61% and the erosion decreased by 83.46% compared with the first stage. (2) Among the various factors affecting the runoff and erosion, Rainfall is the most influential factor, and the influence of other factors also changes gradually with the natural recovery process of vegetation. ③ With the gradual restoration of vegetation, the control over runoff and erosion is gradually enhanced, resulting in the critical rainfall of surface runoff The amount from the first stage 13.70mm, rose to the second stage of 16.21mm, the third stage has risen to 21.14mm.