Ecological Public Welfare Forest In Zhejiang Province The Main Forest Types Of Soil Erodibility Research

With the experiments and analysis,the function of soil and water conservation of main forest types in the countuy of Tonglu and Kaihua,Zhejiang Provincial was studied.The index system of soil and water conservation is divided into three levels: Micro- index of the properties(bulk density,PH value,soil texture,organic material, etc.),middling-index(coefficient of anti-erosion,soil infiltration rate,soil Disinte grating rate,shear strength of the soil),macro-index(soil erodibility K value).A variety of methods were used to anylisize the relationship of these indexes,the results are as follows:(1)Soil erodibility K value of eight types of forests was calculate by EPIC model. By analysis,we could find out that the spatial variability of K value of the studied area was significant.Basing on the theory of Geostatistical analyst,soil erodiable K value distribution map was made by using spatial analysis module of ArcGIS.(2)The relation between physical and chemical properties of the soil,roots and soil shear was analysised,the regression model between them have been established. Roots in the soil have significant "reinforced"."Soil - root complex" can reinforce the shear strength,friction angle and cohesive strength,thereby enhancing the soil of the shear performance.(3)Soil infiltration of different types of forests decreased as the depth of the soil increased gradually.There were close relationship between indexes of soil infiltration,physical and chemical properties of soil and characteristics of roots.(4)Anti-erodibility and anti-scourabiliey of different types of forests decreased as the depth of the soil increased.Anti-erodibility and anti-scourability have close relationship with physical and chemical properties of soil and characteristics of roots.(5)All the 8 forest types in the county of Kaihua could be clustered into 3 kinds based on the function of soil and water conservation.The function of soil and water conservation of the broadleaf forest and the bamboo forest were the strongest,so they were clustered into the first kind.The second kind included the tea garden and the farmland.The Chinese fir forest,the pine forest,the mixed forest and the shrub made up the third kind.