[根据氮和氧同位素分析不同入海河流的硝酸盐来源]。

Q2 Environmental Science
Zhuo-Hang Xin, Peng-Juan Chang, Zhi-Hong Liu, Chang-Chun Song
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引用次数: 0

摘要

陆地输入的氮通量是河口地区氮负荷的主要来源,导致了海岸富营养化和缺氧等生态问题。系统地识别入海不同河流的氮源是控制河口地区氮污染的前提。利用辽宁、河北12条河流179个采样点的氮、氧同位素,系统地确定了不同河流中硝酸盐的来源。利用R (SIAR)模型中的稳定同位素分析,定量计算了不同污染源对河流硝酸盐的贡献率。结果表明,硝化作用是硝酸盐转化的主要过程。12条河流对动物粪便和污水的贡献率为13.9% ~ 90.1%,对土壤氮的贡献率为4.3% ~ 54.0%。此外,沧州市辽家瓦河、宣会河和南牌河的农业肥料贡献率较高,在25.2% ~ 64.4%之间。总体而言,12条河流的氮负荷受到人为活动的高度干扰,不同河流的硝态氮主要来源存在差异。因此,在流域氮素控制与管理中实施有针对性、差别化的控制措施十分重要。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
[Analysis of Nitrate Sources in Different Rivers Flowing into the Sea Based on Nitrogen and Oxygen Isotopes].

The nitrogen flux from terrestrial input is the primary source of nitrogen load in estuarine areas, leading to ecological issues, such as coastal eutrophication and hypoxia. Systematically identifying the nitrogen sources from different rivers draining into the sea is a prerequisite for controlling the nitrogen pollution in estuarine areas. Based on the nitrogen and oxygen isotopes of 179 sampling sites across 12 rivers in Liaoning and Hebei Provinces, the nitrate sources of different rivers were systematically identified. Moreover, the stable isotope analysis in the R (SIAR) model was employed to quantitatively calculate the contribution rates of various pollution sources to river nitrate. The results indicated that nitrification was the primary process of nitrate transformation. For all 12 rivers, the contribution rate of animal manure and sewage ranged from 13.9% to 90.1% and that of soil nitrogen ranged from 4.3% to 54.0%. Additionally, for the Liaojiawa River, Xuanhui River, and Nanpai River in Cangzhou City, agricultural fertilizers were observed to have relatively high contribution rates, ranging from 25.2% to 64.4%. Overall, the nitrogen loads in these 12 rivers were highly disturbed by anthropogenic activities and the primary sources of nitrate varied among different rivers. Therefore implementing targeted and differentiated control measures in watershed nitrogen control and management is important.

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来源期刊
环境科学
环境科学 Environmental Science-Environmental Science (all)
CiteScore
4.40
自引率
0.00%
发文量
15329
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