摘要
地下水埋深是影响污灌污染物在土壤-地下水系统中运移特性的主要因素之一。通过室内污水入渗试验,研究了不同地下水埋深条件下污灌污染物NO3--N在土壤中的运移特性及对地下水环境的影响。研究结果表明:地下水埋深的不同导致了土壤内水分分布和NO3--N迁移路径的差异,从而影响了NO3--N在土壤-地下水系统中的运移特性。埋深浅,高土水势能和反硝化潜势制约了污水携带NO3--N向下层土壤迁移淋失的趋势,但高土水势能和短迁移路径使下层土壤基质中的NO3--N易被挤入至地下水中,NO3--N污染地下水风险较大。
Groundwater depth is one of main factors affecting the migration of sewage irrigation pollutants in soil and groundwater system.This paper analyzed the transportation characteristic of nitrate in soil and groundwater under different groundwater depth through laboratory experiments with sewage irrigation.The results indicated that the effects of different groundwater depth on soil and groundwater environment,including the distribution of soil water and migration path of nitrate,were significant.Under the lower groundwater depth,although the higher soil moisture potential energy and denitrification restrict the migration tendency of nitrate in sewage from up to down,the higher soil moisture potential energy and shorter migration path make it easy for the nitrate of soil matrix to be pushed from subsoil to groundwater,then the pollution risk of groundwater increased.
出处
《节水灌溉》
北大核心
2012年第3期51-56,共6页
Water Saving Irrigation
基金
黄土高原土壤侵蚀与旱地农业国家重点实验室基金(10501-261)
陕西省教育厅科研计划项目(09JK665)
陕西省重点学科建设项目
关键词
污水灌溉
土壤-地下水
地下水埋深
硝态氮
迁移特性
sewage irrigation
groundwater environment
groundwater depth
nitrate
mobility characteristics
