庆阳地区地下水氮污染特征及来源识别研究  

Characteristics and Source Identification of Groundwater Nitrogen Pollution in Qingyang Area

作　　者：黄小龙 文静 胡彦斌 姜建旭 Huang Xiaoong;Wen Jing;Hu Yanbin;Jiang Jianxu(Hydro-geological and Engineering Geological Survey Institude of Gansu Geological and Mineral Exploration and Devel-opment Bureau,Lanzhou 730022,Gansu)

机构地区：[1]甘肃省地质矿产勘查开发局水文地质工程地质勘察院,甘肃兰州730022

出　　处：《陕西水利》2024年第7期82-84,87,共4页Shaanxi Water Resources

摘　　要：地下水是人类生活和生产的重要水源,但是地下水氮污染问题日益突出。以庆阳地区为研究对象,分析地下水氮污染的特征及其来源的识别。研究结果表明,研究区地下水“三氮”污染程度呈现硝态氮(NO_(3)^(-))>氨氮(NH_(4)^(+))>亚硝态氮(NO_(2)^(-))的趋势,NO_(3)(-)-N和NH_(4)(+)-N的浓度与地下水埋深之间存在显著的负相关关系;而NO_(2)^(-)-N受埋深影响较小;溶解氧浓度数值表明地下水中不适合进行反硝化作用,并且δ^(15)N与δ^(18)O的比值显示含水层条件不利于反硝化反应的发生;其次,主要污染源包括硝态氮肥、大气沉降、粪便及生活污水,该研究结果有助于防止过度开采和地下水污染,从而维护庆阳地区地下水资源的可持续性和生态完整性,对于环境保护和可持续发展具有重要意义。Groundwater is an important water source for human life and production,but the problem of groundwater nitrogen pollution is becoming increasingly prominent.Taking Qingyang area as the research objeet,the characteristics and source identification of groundwater nitrogen pollution were analyzed.The results show that the"three-nitrogen"pollution degree of groundwater in the study area presents a trend of nitrate nitrogen(NO_(3)^(-))>ammonia nitrogen(NH_(4)^(+))>nitrite nitrogen(NO_(2)).and there is a sigificant negative correlation between the concentrations of NO_(3)^(-) and (NH_(4)^(+)) and the groundwater depth.NO_(2)^(-)-N is less afeeted by the buried depth.The values of dissolved oxygen concentration indicate that the groundwater is not suitable for denitrification,and the ratio ofδ^(15) to δ^(18)O indicates that the aquifer conditions are not conducive to denitrification.Secondly,the main pollution sources include nitrate nitrogen fertilizer,atmospherie sedimentation,feces and domestic sewage.The research results help prevent over-exploitation and groundwater pollution,thus maintaining the sustainability and ecological integrity of groundwater resources in Qingyang area,which is of great significance for enironmental protection and sustainable development.

关 键 词：地下水 氮污染 来源识别 同位素示踪 

分 类 号：X131.2[环境科学与工程—环境科学]