昕水河流域水保生态工程土壤理化性质变化分析

Soil Physical and Chemical Properties Study after the Implementation of Soil and Water Conservation and Ecological Engineering in Xinshui River Basin

通过对昕水河流域水土保持生态工程项目实施后梯田与林地土壤理化性质变化的分析,探讨了坡改梯与水保林地对土壤理化性质的影响。结果表明,坡改梯后,土壤养分含量增加,降水转化效率和氮素转换效率提高,林地在枯落物数量基本相同的情况下,灌木沙棘和柠条的容水量大于乔木刺槐和油松,随着土层厚度增加,灌木林地土壤容重增加、孔隙度减小,但与荒坡地相比,灌木林地土壤容重减小、孔隙度增大,养分含量增加。因此,水土保持林可以降低土壤容重,增大土壤孔隙度,改善土壤结构,提高土壤肥力。

After the implementation of soil and water conservation engineering which focused on the terracing of sloping fields in Xinshui River basin,the soil bulk density was decreased,the soil porosity increased,soil structure improved and soil fertility enhanced.The soil nutrients were increased and the efficiency of precipitation transformation.The water holding capacity of Fructus Hippophae and Korshinsk Peashrub was more than that of Black Locust and Chinese Pine under the same amount of withered junk in forest land.Comparing to the barren sloping field,the soil bulk density of the shrub lands was decreased,soil porosity and soil nutrient content were increased even though the soil bulk density was increasing and soil porosity was decreasing with the increasing of soil thickness.