soilbrom二溴乙烷soiln.土地；土壤；污物，粪便v.弄污soil and water loss controlling水土流失Soil and pipe corrosion testing土壤和管道防腐测试soil and foundation engineering桩基工程soil organic carbon of cropland农田土壤有机碳soil organic nitrogen fractions土壤有机氮组分soil--cement retaining wall小刚度水泥土组合梁soil evaporation of forest land林地土壤蒸发soil microbial biomass nitrogen土壤微生物量氮soil dilution plating technique土壤稀释平板技术soil micromorphological feature土壤微形特征