基于氮氧同位素技术的黄河上游清水河硝酸盐来源解析

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摘要对清水河灌溉季和非灌溉季各采样点位的水化学指标和硝酸盐的时空分布特征进行分析,运用贝叶斯混合模型MixSIAR模型定量识别了该河流硝酸盐来源,以期了解灌溉对地表水硝酸盐含量的影响.结果表明,清水河水体呈弱碱性,水体氮类以硝酸盐为主,Cl^-和SO₄^2-时空变化特征一致,通过NO₃^-/Cl^-比值和Cl^-浓度的关系,结合清水河地区土地利用、工农业生产的实际情况,揭示了清水河水体硝酸盐受生活污水、畜禽养殖和化学氮肥源的影响较大.MixSIAR模型计算结果表明土壤有机氮、化学氮肥和畜禽养殖对灌溉季水体的贡献率较大,分别为24.8%、24.5%和22.8%,生活污水和大气氮沉降的贡献率分别为14.4%和13.6%;而生活污水、畜禽养殖和土壤有机氮对非灌溉季水体的贡献率较大,分别为26.7%、23.4%和20.4%,大气氮沉降和化学氮肥贡献率分别为16.5%和12.9%.农业灌溉增加了地表水硝酸盐的含量,灌溉季中农用氮肥的施用率较高,贡献了主要的硝酸盐;非灌溉季生活污水的贡献率较高.

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	裴东艳
	谢磊
	徐斌
	何斐
	汪龙眠
	唐登勇
	庞晴晴
	朱翔
	彭福全

关键词 ：清水河, 硝酸盐, MixSIAR模型, 灌溉季和非灌溉季, 空间分布

Abstract：In order to understand the influence of irrigation on nitrate concentration in surface water, the temporal and spatial distribution characteristics of nitrate and hydrochemical indexes at each sampling point in the Qingshui River during irrigation- and non-irrigation seasons were analyzed to identify the sources of nitrate with Bayesian mixed model (MixSIAR) in this study. The results show that the water body of the Qingshui River was of weakly alkaline and dominated with nitrate that was mainly attributed to domestic sewage, livestock and poultry breeding, and chemical nitrogen sources. The MixSIAR model show that soil organic nitrogen, chemical nitrogen fertilizer, and livestock breeding also contributed greatly to the major nitrate content in irrigation season, accounting for 24.8%, 24.5%, and 22.8%, and the contribution of domestic sewage and atmospheric nitrogen deposition were 14.4% and 13.6%, respectively. In addition, in non-irrigation season, the contribution of domestic sewage, livestock breeding, and soil organic nitrogen were 26.7%, 23.4% and 20.4%, and the contribution of atmospheric nitrogen deposition and chemical nitrogen fertilizer were 16.5% and 12.9%, respectively. Furthermore, in the irrigation season, agricultural irrigation increased the nitrate concentration in surface water, and the application of agricultural nitrogen fertilizers was higher, contributing to the major nitrate content; in the non-irrigation season, the contribution ratio of domestic sewage was higher.

Key words： the Qingshui River nitrate MixSIAR model irrigation season and non-irrigation season spatial distribution

收稿日期: 2022-02-24

PACS:

X522

基金资助:生态环境部南京环境科学研究所创新团队项目(GYZX200101);宁夏回族自治区重点研发项目(2021BEG01002,2019BFG02028)

通讯作者: 彭福全,高级工程师,pfq@nies.org E-mail: pfq@nies.org

作者简介: 裴东艳(1998-),女,河南新乡人,南京信息工程大学硕士研究生,主要从事地表河流DOM、硝酸盐氮氧同位素来源分析研究.

引用本文:

裴东艳, 谢磊, 徐斌, 何斐, 汪龙眠, 唐登勇, 庞晴晴, 朱翔, 彭福全. 基于氮氧同位素技术的黄河上游清水河硝酸盐来源解析[J]. 中国环境科学, 2022, 42(9): 4115-4121. PEI Dong-yan, XIE Lei, XU Bin, HE Fei, WANG Long-mian, TANG Deng-yong, PANG Qing-qing, ZHU Xiang, PENG Fu-quan. Analysis of nitrate sources in the Qingshui River of the Yellow River with nitrogen and oxygen isotope technique. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(9): 4115-4121.

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http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2022/V42/I9/4115

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