仙女湖水体硝酸盐来源解析及其不确定性  

Nitrate Source Appointment and Uncertainty Analysis in Waters of Xiannyu Lake

作　　者：黄立章 吴永明[2] 李荣富 邓觅[2] 刘丽贞[2] 游海林[2] 周小华 朱林 HUANG Lizhang;WU Yongming;LI Rongfu;DENG Mi;LIU Lizhen;YOU Hailin;ZHOU Xiaohua;ZHU Lin(China Railway Water Conservancy&Hydropower Planning and Design Group,Nanchang 330029,China;Institute of Microbiology,Jiangxi Academy of Sciences,Nanchang 330096,China)

机构地区：[1]中铁水利水电规划设计集团有限公司,江西南昌330029 [2]江西省科学院微生物研究所,江西南昌330096

出　　处：《环境科学与技术》2024年第6期131-137,共7页Environmental Science & Technology

基　　金：中国中铁股份有限公司科技研究开发计划项目(2021-重大-08);省级财政科研项目经费包干制试点项目(2022YSBG22014);国家自然科学基金(42267029,42161022,42261020)。

摘　　要：硝酸盐是地表水氮超标的主要污染物,准确识别和解析污染源的贡献率对源头管控至关重要。该文以新余市仙女湖为研究对象,利用硝酸盐氮氧稳定同位素和贝叶斯混合模型分析水体中硝酸盐的转化过程、污染源贡献比例及其不确定性。结果表明,仙女湖水体硝态氮占比超过60%,硝化作用占主导地位的同时表层水体还存在浮游植物的同化作用。水体中来自粪便与污水的硝酸盐贡献率达到59.4%,其后依次为化肥(20.7%)、土壤有机氮(17.3%)和大气沉降(2.6%)。土壤有机氮和化肥的硝酸盐贡献不确定性最高,忽略硝化作用的同位素分馏效应会显著增加两者的不确定性。Nitrate is the main contaminant of excessive nitrogen in surface water.Accurate identification and analysis of different source’s contribution rates is the key to source control of nitrate pollution.Based on the stable isotopes of nitrogen and oxygen in nitrate and Bayesian mixing model,nitrate transformation processes,proportions of source contributions and the corresponding uncertainty are studied in waters of Xiannyu Lake,Xinyu City.The results show that NO3--N was the primary form of nitrogen in waters of the lake,with its proportion exceeding 60%.Assimilation of phytoplankton existed in the surface waters while nitrification dominated the nitrogen cycling.The main nitrate source was manure/sewage,the proportional contribution of which is 59.4%,and then followed by nitrogen fertilizer(20.7%),soil organic nitrogen(17.3%)and atmospheric deposition(2.6%).The proportional contributions of soil organic nitrogen and fertilizer sources showed the highest uncertainty,and the uncertainty would increase significantly when ignoring the fractionation effect of nitrification.

关 键 词：硝酸盐 稳定同位素 贝叶斯混合模型 不确定性 

分 类 号：X522[环境科学与工程—环境工程]