soiltex土壤酸度试剂soiln.土地；土壤；污物，粪便v.弄污soil ecological environment土壤生态环境soil chemical stabilization软土化学稳定soil and water conservation水土保持学Soil and Resources of China中国土壤与土壤资源Soil erodibility K-factor土壤可蚀性K值soil water retention curves土壤水分特征曲线soil particle fractionation土壤粒级soil relative water content土壤相对含水量soil from urban green space园林土壤soil and water eonservation水土保持