摘要
以上海市南汇区新场镇果园村为研究区域,连续监测了该村域地下水中的总氮和"三氮"含量变化。结果表明:该村域地下水中的"三氮"主要以NO3--N形态存在,平均浓度范围为1.43～13.71 mg/L;地下水氮污染与土地利用类型有关,居民区地下水中NH4+-N污染最为严重,平均浓度范围为0.074～0.457 mg/L;河道旁地下水中NH4+-N污染较轻;果园旁和河道旁地下水总氮污染程度相当,平均浓度范围分别为33.67～62.57 mg/L,33.05～65.04 mg/L。均比居民区地下水污染严重。同时研究发现,该村域地下水中的总氮和"三氮"含量也受降雨强度和降雨时间的影响。同时,采用模糊综合评价法评价了该区域地下水氮污染的环境风险。
In order to know the characteristics of non-point source pollution of nitrogen in groundwater in urban agricultural region,the amounts of TN and the three forms of nitrogen（NO-3-N,NH＋4-N,and NO-2-N） in groundwater were continuously monitored in orchard village,Nanhui District,Shanghai from July to September in 2009.The results showed that NO-3-N was the main form of the three forms of nitrogen（NO-3-N,NH＋4-N,and NO-2-N） in groundwater with the average concentration in the range of 1.43～13.71 mg/L.Nitrogen pollution in groundwater was dependent on the land use.NH＋4-N pollution in groundwater under residential area was the most serious with the average concentration in the range of 0.074～0.457 mg/L,while that near the river was light.And TN pollution in the groundwater near the river and the orchard was the same with the average concentration in the range of 33.67～62.57 mg/L and 33.05～65.04 mg/L,respectively,more serious than under residential area.The amounts of nitrogen in groundwater in the village were also influenced by rainfall intensity and rainfall time.Meanwhile,environmental risk of nitrogen pollution in groundwater was evaluated by using fuzzy comprehensive model.
出处
《水土保持学报》
CSCD
北大核心
2010年第3期56-59,70,共5页
Journal of Soil and Water Conservation
基金
国家“863”计划项目(2007AA10Z441)
上海市科委项目(07JC14025,07DZ12055,08d21900404)
农业部都市农业(南方)重点实验室开放基金(09UA003)
关键词
地下水
非点源污染
氮
都市农业区域
风险评估
groundwater
non-point pollution
nitrogen
urban agricultural region
risk assessment
