Seasonal nitrogen sources and its transformation processes revealed by dual-nitrate isotopes in Xiamen Bay, China

IF 2.1 4区环境科学与生态学 Q3 ECOLOGY

Regional Studies in Marine Science Pub Date : 2024-11-09 DOI:10.1016/j.rsma.2024.103902

Yiqian Shi , Liping Jiao , Sizhe Qiu , Chen Huang , Zhi Zeng , Ying Zhang , Xunyao Zhang , Shuqin Tao , Jinpei Yan , Kai Zhang

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Abstract

The eutrophication load in coastal waters is gradually increasing due to excessive nitrate (NO₃⁻) input caused by intense human activities. The tracing of NO₃⁻ sources as well as their biogeochemistry is crucial for the development of effective measures to alleviate the eutrophication load. In this study, seasonal seawater samples from Xiamen Bay were investigated to explore the sources and fates of NO₃⁻ using dual nitrate isotopes. The results indicated that the NO₃⁻ is less affected by biological processes and mainly influenced by the terrestrial sewage discharges (48 %) during rainy seasons. Contrarily, as runoff input decreases and external seawater intrusion increases, the assimilation of phytoplankton dominates the process of nitrate removal during dry seasons. This study suggests that the increase in the input of terrestrial sewage nutrients is responsible for the increase in eutrophication in Xiamen Bay, providing a basis for controlling water eutrophication and regional environmental governance.

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双硝酸根同位素揭示中国厦门湾的季节性氮源及其转化过程

由于激烈的人类活动造成过量的硝酸盐（NO3-）输入，沿岸水域的富营养化负荷逐渐增大。追溯 NO3- 的来源及其生物地球化学特征，对于制定有效措施减轻富营养化负荷至关重要。本研究对厦门湾的季节性海水样本进行了调查，利用双硝酸根同位素探讨了 NO3- 的来源和去向。结果表明，在雨季，NO3-受生物过程的影响较小，主要受陆地污水排放的影响（48%）。相反，随着径流输入的减少和外部海水入侵的增加，浮游植物的同化作用在旱季的硝酸盐去除过程中占主导地位。该研究表明，陆源污水营养盐输入的增加是厦门湾富营养化加剧的原因，为控制水体富营养化和区域环境治理提供了依据。

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来源期刊

Regional Studies in Marine Science Agricultural and Biological Sciences-Ecology, Evolution, Behavior and Systematics

CiteScore

3.90

自引率

4.80%

发文量

336

审稿时长

69 days

期刊介绍： REGIONAL STUDIES IN MARINE SCIENCE will publish scientifically sound papers on regional aspects of maritime and marine resources in estuaries, coastal zones, continental shelf, the seas and oceans.