Function On Soil And Water Conservation Of The Main Forest Types In Anji County

By means of principal component analysis and factor analysis,function on soil and water conservation of the main forest types in Anji County, Zhejiang Province was studied. It showed:(1) The differences of the main forest types about the soil infiltration was significant. The infiltration property of forest land was better than that of bare land. The infiltration rate of soil surface was higher, which was very important to prevent soil erosion. And the infiltration rate decreased with the increase of soil depth. Both Костякоь infiltration model and Philip infiltration model could better inflect the soil infiltration course of each vegetation types in research area. It showed that Костякоь formula analog effect was the best, and the Horton model and common experienced infiltration model were bad relatively.(2) It was found that >0.25mm,>0.5mm water stable aggregates and water stable index can be regarded as the optimum 3 indexes to express soil anti-erodibility of the main forest types in Anji County by means of principal component analysis.There was much variance in soil anti-erodibility of different plots and levels.Soil anti-erodibility of Deciduous broad-leaved forest, Shrub community, Moso bamboo stand and Pinetum were high. Bare land was the poorest one. Soil anti-erodibility changed very much in different levels, especially in the same plot. From the soil surface to the bottom, Soil anti-erodibility reduced to some extend. With discriminant analysis, we could get 3 discriminant functions concerning good soil anti-erodibility, medium soil anti-erodibility and poor soil anti-erodibility in Anji County. The average mistaken probability was only 0.0704. The model could be used to evaluate soil anti-erodibility in this area.(3) Except for Moso bamboo stand, soil anti-scourability of soil surface in all forest lands was the highest. And the soil anti-scourability of deep soil was less. Soil anti-scourability of forest lands was higher than that of bare land.(4) There were great differences in soil reservoir capacity of all plots. The soil water total volumetric capacity, storage capacity, flood control capacity and the maximal available water capacity of Deciduous broad-leaved forest and Shrub community were high, which was helpful to reduce surface runoff. The dead capacity of the bare land was the highest and it's water-holding function was the poorest.(5) All the 8 plots could be clustered into 4 kinds based on function on soil and water conservation. The function on soil and water conservation of Deciduous broad-leaved forest and Shrub community were the strongest, so these 2 plots were clustered into the first kind. The second kind was composed of Tea Garden, Pinetum and grass land. Whereas the fourth kind was made up of only the bare land, whose fun(?)n soil and water conservation was the most delicate one.(6) Physical and chemical soil properties and roots were the most effective in improving...