---

作 者 ：刘宏斌1;雷宝坤1;张云贵2;张维理1;林葆1

期 刊 ：植物营养与肥料学报 2001年 7卷 4期 页码：385-390

关键词：硝态氮；地下水；污染；

Keywords:nitrate, groundwater, pollution,

摘 要 ：对北京市顺义区 146眼地下水井中 ,其中饮用水井 (120～200m深 ) 32眼、农灌水井 (井深70～ 100m) 95眼、手压水井 (井深 6～20m) 19眼的硝态氮含量进行了调查分析。结果表明 ,该区饮用水硝态氮 (NO₃^--N)含量较低 ,全部达到国家饮用水一级标准 (<10mg/L) ,水质总体良好 ,但个别地区已处于污染警戒状态 ;农灌水质量略逊于饮用水 ,但总体状况仍属良好 ,硝态氮 (≥10mg/L)超标率为 7.4 % ,另有 6.3%处于污染警戒状态 ;手压井水硝态氮污染较为严重 ,超标率达 36 .8% ,尤其是位于菜田中的手压水井超标率高达 50%以上。从耕地类型来看 ,粮田农灌水质量优于菜田。地下水硝态氮含量与井深度呈负相关关系 ,机井越深 ,硝态氮含量越低 ,超标率越低。本文还对地下水硝态氮污染的原因进行了分析。

Abstract:Nitrate content in groundwater of Shunyi District have been investigated from 1999 to 2000. Three types of groundwater were defined based on the depth and utilization of well, that is drinking well(DW)about 70～150m, irrigation well(IW)about 70～120m and hand pumped well(HW)about 6～20m. It is shown that the nitrate content in groundwater is negatively relative to the depth of well, i.e. 2.54mg/L for DW, 2.05mg/L for IW and 8.39mg/L for HW,and there is none of DW in which nitrate content is above 10mg/L, but 7.4 % of IW and 36.8% of HW is above 10mg/L, unsuitable for drinking. Except for IW, the groundwater of Shunyi District is well in general. Its also shown that the quality of groundwater in vegetable field is inferior to that of crop field, which can be attributed to super input of nitrogen fertilizer in vegetable production.

---