Analysis of soil anti-erodibility of main forest types in the south hilly region of Jiangsu province

This paper studies the anti-erodibility of four kinds of forest soil(Chinese fir(Cunninghamia lanceolata),Masson pine(Pinus massoniana Lamb),Quercus(Quercus acutissima) and Bamboo(Phyllostachys pubescens) in the South Hilly Region of Jiangsu Province.The results showed that the soil anti-erodibility index,impact index and shearing strength in different forest soil have significant regularity,that is,all the three indexes show a decreasing trend with the increscent soil depth.The relationship between the soil anti-erodibility index(S)in different forest soil and the immersion time(t) is a quadratic polynomial function,whose general formula is S=at2+bt+c.Based on Principal component analysis with 17 indicators including soil properties,soil aggregate characteristics,impact resistance and shear resistance,the best indicator system for evaluating the soil Anti-erodibility was reached;Calculating the soil Anti-erodibility index showed that the order of anti-erodibility of different forest soil is:Bamboo(Phyllostachys pubescens)(1.33)Chinese fir(Cunninghamia lanceolata)(0.35) Quercus(Quercusacutissima)(-0.75) Masson pine(Pinus massoniana Lamb)(-0.89).