陕北黄土坡面典型退耕草本植物对土壤侵蚀过程的调控效应与机理

退耕还草是调控坡面侵蚀的有效措施，退耕草本植物调控土壤侵蚀通过同步调控侵蚀动力与侵蚀阻力而实现。以往研究缺乏同步观测研究草本植物对土壤侵蚀、侵蚀动力及侵蚀阻力的调控效应，以及草本植物对侵蚀动力、侵蚀阻力调控效应对侵蚀调控效应的同步影响贡献，严重制约了对退耕还草坡面草本植物调控土壤侵蚀过程机理的全面与深入认识。本研究针对陕北黄土地区坡面典型退耕草本植物（白羊草）对土壤侵蚀的调控作用，通过草地坡面与裸地坡面模拟降雨与定流量供水组合试验观测，研究典型退耕草本植物对坡面侵蚀过程的调控效应、对坡面侵蚀动力的调控效应与机理、对坡面侵蚀阻力的调控效应与机理，量化草本植物对侵蚀动力调控效应与对侵蚀阻力调控效应对侵蚀调控效应同步影响的分别贡献，阐明典型退耕草本植物对坡面侵蚀的调控机理，实现陕北黄土坡面典型退耕草本植物对土壤侵蚀过程调控效应与机理的研究揭示，为黄土高原坡面侵蚀控制及生态建设提供科学依据。

Returning farmland to grassland is an effective measure to control slope erosion. Recovered herbaceous plants can control soil erosion by regulating erosion dynamics and erosion resistance, simultaneously. However, there is a lack of studies to systematically study the synchronization contribution of effects of herbaceous plants reducing erosion dynamics and increasing erosion resistance on controlling soil erosion. The lacking of these studies greatly restricts the in-depth and comprehensive understanding of the kinetic mechanism of recovered herbaceous plants controlling soil erosion. Accordingly, the effects of typical recovered herbaceous plants (Bothriochloa ischaemum) on soil erosion will be studied in this project, based on laboratory simulated rainfall and constant-flow supply experiments, on loess slope in northern Shaanxi Province.The effectiveness of the typical recovered herbaceous plants in controlling soil erosion of loess slope will be studied. As well as the effectiveness and mechanism of the typical recovered herbaceous plants in reducing erosion dynamics and increasing erosion resistance also will be analyzed. The contribution rates of the typical recovered herbaceous plants on reducing erosion dynamics and increasing erosion resistance to its effect of controlling soil erosion will be quantified. The results can reveal of regulation effects and mechanisms of the typical recovered herbaceous plants on soil erosion processes on loess slope in northern Shaanxi Province, and provide scientific support for soil erosion controlling and ecological constructions on the Leoss Plateau.