密怀顺研究区地下水NO_(3)^(-)-N时空变化分析  

Spatio-temporal variation of groundwater NO_(3)^(-)-N in Miyun-Huairou-Shunyi recharge area

作　　者：张雨航 安同艳[1,2] 史芫芫[1,2] 范清[1,2] 何炜 罗孜[1,2] ZHANG Yuhang;AN Tongyan;SHI Yuanyuan;FAN Qing;HE Wei;LUO Zi(Beijing Academy of Environmental Protection Sciences,Beijing 100037;National Engineering Research Center for Urban Environmental Pollution Control,Beijing 100037,China)

机构地区：[1]北京市环境保护科学研究院,北京100037 [2]国家城市环境污染控制工程技术研究中心,北京100037

出　　处：《干旱区资源与环境》2021年第2期96-101,共6页Journal of Arid Land Resources and Environment

基　　金：国家重点研发计划项目(No.2016YFC0503601);水体污染控制与治理科技重大专项(No.2018ZX07109-004)资助。

摘　　要：密怀顺地区是北京市重要的水源涵养区,直接影响着主城区的供水安全。2014年南水北调盈余水量通过潮白河河道回补地下水,地下水位不断抬升,使常年积累在耕地土壤中NO_(3)^(-)-N对地下水环境风险不断增加。通过对地下水中NO_(3)^(-)-N和耕地属性地块研究。结果表明:1)2015-2018年研究区地下水NO_(3)^(-)-N浓度有升高趋势;2)2015-2018年研究区水质稳定区面积达到164.26km^(2),占比33.78%;其次为水质略变差区和水质变差区,面积分别为136.76km^(2)和112.74km^(2),占比分别为28.12%和23.18%。3)耕地属性不变的7个有监测地块地下水NO_(3)^(-)-N浓度均有不同程度升高,MW-3和MW-1地块超过地下水Ⅲ类水质标准;4)地下水NO_(3)^(-)-N含量变化与地下水回补有一定关联。Miyun-Huairou-Shunyi recharge area is an important water conservation area in Beijing,which directly affects the safety of water supply in the main urban area.In 2014,the surplus water from the South-to-North Water Diversion project was used to recharge groundwater through the Chaobai River channel,and the groundwater level was constantly rising.As a result,the perennial accumulation of NO_(3)^(-)-N in cultivated soil was increasing the risk to groundwater environment.So,the change of NO_(3)^(-)-N in groundwater of this area needs to study.Our study shows that:(1)From 2015 to 2018,the concentration of NO_(3)^(-)-N in local groundwater in the study area showed an increasing trend.(2)From 2015 to 2018,the water quality stability area of the study area reached 164.26km^(2),accounting for 33.78%of the total area.The water quality slightly worse zone is 136.76km^(2),and area of water quality deterioration zone is 112.74km^(2),accounting for 28.12%and 23.18%,respectively.(3)The concentration of NO_(3)^(-)-N in groundwater of 7 monitored plots in cultivated land all increased in different degrees,and two plots surpassⅢgroundwater quality standards.(4)There is a certain correlation between the change of groundwater NO_(3)^(-)-N content and groundwater recharge.

关 键 词：地下水 NO_(3)^(-)-N 耕地 时空变化 密怀顺 

分 类 号：P641[天文地球—地质矿产勘探]