Study on soil anti-erodibility of different vegetation types in Gangzhai small watershed of central Guizhou Province

In order to evaluate the function of soil and water conservation about the major vegetation types in Gangzhai small watershed of central Guizhou,the top soil under the five vegetation types and the bare land were chosen as the research objective,and the soil anti-erodibility related indicators were selected,the erodibility differences in the different vegetation types were analyzed,and the principal component analysis was used to screen the best indicator of the evaluation of soil erosion resistance strength,the corrosion resistance of composite index was calculated,The results show that(1) the erodibility of five different vegetation types were superior to non-forest land(except for a few indicators),Quercus acutissima was the best in the performance of corrosion resistance index,mixed Forest of Pinus massoniana and Pinus armandii were in the second place;(2) the best evaluation five indicators under different vegetation types in the erodibility were more than 0.25 mm water-stable aggregate content,the rate of structural damage,the dispersion coefficient,aggregation situations and aggregation degree;(3) according to soil anti-erodibility comprehensive index,five different types of vegetation and woodland top soil erodibility index corrosion resistance were from strong to weak: acutissima shrub(1.302),young mixed forest of Pinus massoniana and Armand Pine(1.073),young Cryptomeria(0.190),mixed young forest of China fir and Chinese cryptomeria,Cryptomeria(-0.145),young cypress plantation(-0.428),bare land(-1.992).It is suggested that the small watershed in after rocky desertification and ecological recovery processacutissima natural secondary forest should be the appropriate human management and protection measures,in order to improve the community overall ecological effects select and create mixed forest of pine masson and armand as an important ecological public welfare.