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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引用次数: 0

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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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.