Research progress and prospect of vegetation control mechanism of soil and water loss
[Background]Soil erosion is one of the most serious forms of land degradation in the world,which greatly restricts the sustainable development of regional economy and society.Vegetation is widely considered as a key factor to control soil erosion.With the joint efforts of scholars from all over the world,researches on the mechanism of vegetation controlling soil erosion have achieved abundant results,which has been widely used in the soil and water conservation practices.However,there are some uncertainties in the related research,and the regulation mechanisms of vegetations on soil erosion are still not clear enough.[Methods]In this study,the mechanisms of vegetations regulating soil erosion were reviewed from five aspects:Research methods of the relationship between vegetation and soil erosion,the characterization indexes of vegetation regulating soil erosion,the influence mechanism of different vegetation components on soil erosion,the influence mechanism of vegetations on eroded sediment sorting,and the interaction effect of vegetations and other soil erosion factors.The English and Chinese literatures were searched from the Web of Science and CNKI database,respectively,with the subject"vegetation""soil erosion""soil and water loss",etc.The literature screening was conducted based on the factors such as year of publication,number of citations,and published journals.[Results]1)The relationship between vegetation and soil erosion is mainly studied through numerous field observations or remote sensing data,quantitative models,as well as field runoff plot observations and simulated rainfall experiments under vegetation cover conditions.2)Under the background of climate change,it is necessary to strengthen the research on the mechanism of shallow landslide induced by vegetation roots under extreme rainstorm conditions.The effect of vegetation litter on soil erodibility and its seasonal variation mechanism need to be further clarified.3)The positive effect of sediment reduction is challenged when the vegetation coverage does not reach a stable value,and this stable value of vegetation coverage varies with soil texture,vegetation type and slope,while the mechanism of the stable value of vegetation coverage on soil erosion is not clear.4)It is urgent to strengthen the research of surface runoff hydrodynamics under vegetation coverage and its influence mechanism on the sorting of eroded sediment particles,as well as the quantitative study of soil loss under forest based on sediment sorting theory.5)The mechanism of interaction effects of vegetation,slope gradient,rainfall intensity and other factors on soil erosion needs to be further studied.In addition,in order to promote the further development of the physical model of soil erosion,it is of great significance to develop the vegetation erosion dynamics equation including vegetation parameters,soil parameters,rainfall and overland flow hydrodynamic parameters.[Conclusions]In view of the differences in soil erosion control mechanisms among different vegetation types,this paper mainly summarizes the research results of the relationship between forest and grass vegetations and soil erosion,as well as their regulating mechanisms of soil erosion.
vegetationsoil and water losscorrosion resistancerainfall runoffregulation mechanismcanopylitterroot system
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