doi:10.12202/j.0476-0301.2020216叶芝菡^,,
黄炳彬,
常国梁,
李卓凌
北京市水科学技术研究院，100048，北京
基金项目:国家水体污染控制与治理科技重大专项资助项目（2017ZX07102-001）

详细信息

通讯作者:叶芝菡（1979—），女，博士，正高级工程师. 研究方向：流域生态修复. E-mail：zhihan79@163.com

中图分类号:X824

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出版历程

收稿日期:2020-03-12
网络出版日期:2021-06-01
刊出日期:2021-09-02

Concentration variations and sources of nitrogen in Banchengzi Reservoir watershed upstream of Miyun Reservoir

Zhihan YE^,,
Bingbin HUANG,
Guoliang CHANG,
Zhuoling LI
Beijing Water Science and Technologic Institute, 100048, Beijing，China



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摘要
摘要:以密云水库上游的半城子水库流域为研究对象，2019年针对氮的时空分布与不同来源开展连续监测，分析流域内氮的时空变化特征并识别氮的主要来源．结果表明：半城子水库汛期强降雨时期总氮（TN）质量浓度较其他时段明显升高，相应洪水携带氮入库负荷占全年总负荷的90%以上，是氮控制的重点时段；2条入库河流，牤牛河汛期TN成倍超出史庄子沟，在中下游尤为明显，是氮控制的重点区域；库区及入库河流的氮以硝酸盐氮为主，平均占比74.3%，雨季较高；解析重要场次洪水的TN来源，自然因素（林草覆盖和降雨）是主要来源，占比超过60%，其次是人类生产和生活影响，其中废弃矿区对TN影响较大，应给予重视．研究结果可为密云水库流域氮源解析和控氮方案制定提供数据支撑．
关键词:半城子水库/
氮/
源解析
Abstract:The nitrogen concentration in Miyun Reservoir is increasing, threatening the water quality guarantee for Beijing．Here we investigate the nitrogen concentrations and sources of origin in Banchengzi Reservior watershed, upstream of Miyun Reservoir．Nitrogen concentrations in flooding period were found to have increased markedly．Nitrogen load in the largest flood accounted for more than 90% of the whole year．During flooding periods, nitrogen concentrations in Mangniu River more than doubled that in Shizhuangzi River．Mangniu River was apparently the key catchment to control nitrogen output．Nitrate was found to be the major state of nitrogen, at an average percent of 74.3%, higher in rainfall seasons．Non-point sources were found to be the major source of nitrogen．At Banchengzi Reservoir watershed, natural factors including forests and rainfall were the major sources of nitrogen, the total percentage being >60%．The effect of human activities was less prominent, but mining was an important source of nitrogen increase．This work identified the major sources of nitrogen, and will be helpful for watershed management at Miyun Reservoir．
Key words:Banchengzi Reservior/
nitrogen/
source analysis