• 关键词：浑河流域沈抚段  氮、氧同位素技术  SIAR质量混合模型  氮素贡献率

• 基金项目：国家水体污染控制与治理科技重大专项项目（No.2014ZX07202-011）；国家自然科学基金（No.51508342）

• 傅金祥
• 沈阳建筑大学辽河流域水污染防治研究院, 沈阳 110168

• 单敬敬
• 沈阳建筑大学辽河流域水污染防治研究院, 沈阳 110168

• 袁雅姝
• 沈阳建筑大学辽河流域水污染防治研究院, 沈阳 110168

• 郜玉楠
• 沈阳建筑大学辽河流域水污染防治研究院, 沈阳 110168

• 吴睿
• 沈阳建筑大学辽河流域水污染防治研究院, 沈阳 110168

• 杨佳蓉
• 沈阳建筑大学辽河流域水污染防治研究院, 沈阳 110168

• 摘要：通过对浑河流域沈抚段水体样品和主要污染源样品采集及检测，结合氮氧双稳定同位素及SIAR模型，统计分析研究区域氮素污染现状及氮素污染来源，绘制典型污染源的δ¹⁵N、δ¹⁸O特征分布图并估算其贡献率，准确追踪和定量外来性氮，从而更好地控制进入浑河流域的氮负荷.结果表明，浑河流域沈抚段受排污口、支流输入、工业废水的影响较大，氮素污染严重.研究区域δ¹⁵N值在-5.23‰~33.8‰范围内波动，δ¹⁸O值变化范围较大，为-4.12‰~61.54‰.工业废水对氮素贡献率为20.6%~96.3%，贡献率最高，其次是生活污水与粪便、化学肥料、土壤，贡献率分布范围分别为0.3%~29.4%、1.2%~33.5%、1.7%~30.1%，大气沉降对氮素贡献率最低，为0~7.2%.考虑大气污染及污废水排放规律能更准确的确定氮素的污染来源.

• Abstract：Based on the analyses of the collected water samples in Shenyang-Fushun section of Hunhe River basin and the samples of major pollution sources, in combination with nitrogen and oxygen bi-stable Isotopes and statistic analysis of the SIAR model,the status of regional nitrogen pollution and its sources were studied.The characteristic distribution profiles of the δ¹⁵N and δ¹⁸O of the typical pollution sources were drawn to estimate their contribution and to precisely track and quantify the exogenous nitrogen, so that the nitrogen load into the Hunhe River basin could be effectively controlled. The results showed that the water quality of the Shenyang-Fushun section of Hunhe River basin was greatly affected by the sewage discharge outlet, tributary input, and industrial wastewater discharge, resulting in serious nitrogen pollution. Within the region, the δ¹⁵N value fluctuated in the range of -5.23‰~33.8‰, and the δ¹⁸O value ranged from -4.12‰ to 61.54‰. The contribution of industrial wastewater to nitrogen load was among the highest (20.6%~96.3%), followed by that of domestic sewage and manure (0.3%~29.4%), chemical fertilizer (1.2%~33.5%) and soil (1.7%~30.1%), while the contribution of atmospheric deposition was among the lowest (0~7.2%). The pollution sources of nitrogen can be determined more accurately if air pollution and the rules of wastewater discharge are considered.

• Key words：Shenyang-Fushun section of Hunhe river basin  nitrogen and oxygen isotope techniques  hybrid SIAR mass balance model  nitrogen contribution

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