Study on Soil Anti-erodibility of Different Vegetation Restoration Types in Guandi Mountain

The soil anti-erodibility in 0-20cm soil layer were studied for four vegetation restoration types(including the coniferous and broad-leaved mixed forest(by the composition of Picea meyer,P.wilsonii,Larix principis-rupprechtii,Populus davidiana and Betula platyphlla),the broad-leaved forest of P.davidiana and B.platyphlla,the shrub of Hippophaer hamnoides and the Larix principis-rupprechtii forest)and an abandoned land(control)in Guandi Mountain.The results showed that the soil anti-erodibility significantly increased(P0.05)compared to the abandoned land.In different forest lands,the contents of soil organic carbon,soil aggregates0.25mm and water-stable aggregates0.25mm increased obviously,the wet-sieving mean weight diameters(MWD)and soil aggregate water-stability index improved significantly and the soil aggregate breakage rate and soil bulk density reduced obviously.At the same time,vegetation restoration was helpful for the situation of the soil micro-aggregate and decreased the dispersion ratios and increased the aggregation degree.Using the method of principal component analysis,three principal component of soil anti-erodibility could be determined.Then the comprehensive evaluation model of soil anti-erodibility was found,which was Y=0.718Y1+0.167Y2+0.115Y3.According to the comprehensive principal component index of anti-erodibility,the order of anti-erodibility with different vegetation restoration types was:The coniferous and broad-leaved mixed forest(2.621)the broad-leaved forest(1.204)the shrub(-0.159)the Larix fores t(-1.056)the abandoned land(-2.609).It is suggested that the management of the artificial forest should be strengthened during ecological restoration.So the function of water conservation and soil conservation could be enhanced.