Coupling Correlation Analysis of Soil Erosion Resistance and Its Influencing Factors in Vegetation Restoration Slopes
In order to provide reference and technical support for slope vegetation restoration design,based on field survey data of road slopes in Neijiang City after 0,5,7,15 and 20 years of vegetation restoration,the average mass diameter of soil particles(aggregates)and water stability index were used as soil erosion resistance indicators.The content of large aggregates with soil particle size≥0.25 mm,bulk densi-ty,organic matter content,alkaline nitrogen content,available phosphorus content and available potassium content were used as the influen-cing factors of soil erosion resistance.Principal component analysis and coupling coordination analysis were used to explore the coupling rela-tionship between soil erosion resistance and its influencing factors of slopes with different vegetation restoration years.The main conclusions are as follows:a)There are significant differences in soil erosion resistance indicators and their influencing factors among different vegetation restoration years.With the extension of vegetation restoration years,the content of soil macro-aggregates and nutrients increases,the soil bulk density decreases and the soil erosion resistance increases.b)The content of alkaline nitrogen content,organic matter content,available phosphorus content,macro-aggregate and bulk density are the main influencing factors on soil erosion resistance at different vegetation resto-ration years.c)Among the soil physical and chemical properties indicators,the chemical indicators(available phosphorus content,alkaline nitrogen content,organic matter content and available potassium content)have a greater impact on soil erosion resistance indicators than that of physical indicators(large aggregate content and bulk density).When designing vegetation slope protection,attention should be paid to the maintenance of organic matter and available fertilizers.d)The coupling coordination degree between soil physical and chemical properties in-dicators and soil erosion resistance indicators increases with the extension of vegetation restoration years.At 15 years of vegetation restoration,the coupling coordination type of the two is still weak coordination,and at 20 years of vegetation restoration,the coupling coordination type of the two is still moderate coordination.In order to further improve the physical and chemical properties of slope soil,promote the formation of stable soil structure and enhance soil erosion resistance,a longer period of vegetation restoration is needed.
soil erosion resistancevegetation restorationslopesoil physical and chemical propertiescoupling correlation
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