Soil pH土壤pHsoiln.土地；土壤；污物，粪便v.弄污soil-water conservation水土保持soil mechanical parameter土力学参数soil permeation parameter土壤入渗参数soil mechanics laboratory土工试验室soil effective phosphorus土壤有效磷soil-suspending ability悬污能力soil and water conversion水土保持soil microbial population土壤微生物群系soil-engaging component触土部件soil mass sliding surface土体滑动