soil EC土壤电导率soiln.土地；土壤；污物，粪便v.弄污soil thermal storage土壤蓄热Soil water rnovement土壤水分运动Soil macro-animals大型土壤动物soil moisture regime土壤湿润状态soil heat convection土壤热对流soil characteristics土的特性soil surface acidity土壤表面酸度soil specific volume土壤比容soil nutrient system土壤养分系统soil urease activity土壤脲酶活性