soil N土壤氮soiln.土地；土壤；污物，粪便v.弄污soil water suction土壤水吸力soil sampling mass取土质量soil consolidation土壤固结soil trace element土壤微量元素soil reinforcement土体加固Soil horizon depth土层厚度soil-arch effect土拱效应soil heat exchange土壤热交换soil nutrient loss土壤养分流失soil and vent pipe污物排气管