文献类型：期刊文献

英文题名：Typhoon landfall track significantly changes coastal nitrogen cycling pathways by altering hydrodynamic regimes

作者：Chen, Chunqing[1,2];Lao, Qibin[1,2,3,4];Zhou, Xin[1,2];Cai, Shangjun[1,2];Chen, Fajin[1,2,3,4]

机构：[1]Guangdong Ocean Univ, Coll Ocean & Meteorol, Zhanjiang 524088, Peoples R China;[2]Guangdong Ocean Univ, Sch Chem & Environm, Zhanjiang 524088, Peoples R China;[3]Guangdong Ocean Univ, Key Lab Coastal Ocean Variat & Disaster Predict, Zhanjiang 524088, Peoples R China;[4]Guangdong Ocean Univ, Key Lab Climate Resources & Environm Continental, Dept Educ Guangdong Prov, Zhanjiang 524088, Peoples R China

年份：2026

卷号：225

外文期刊名：MARINE POLLUTION BULLETIN

收录：SCI-EXPANDED(收录号：WOS:001663696900001)、、EI(收录号：20260219875483)、Scopus(收录号：2-s2.0-105026658516)、WOS

基金：This study was supported by the National Natural Science Foundation of China (42276047, 42506037) , Guangdong Basic and Applied Basic Research Foundation (2024A1515110183, 2023A1515110473) , the Basic and Applied Basic Research Foundation of Guangdong Province (2023B1515120029) , and Youth S&T Talent Support Programme of Guangdong Provincial Association for Science and Technology (SKXRC2025386) , and program for scientific research start-upfunds of Guangdong Ocean University (060302032502) .

语种：英文

外文关键词：Nitrogen cycle; Nitrate dual isotopes; Typhoon track; Zhanjiang Bay

外文摘要：Coastal nitrogen (N) cycling is vulnerable to typhoon disturbances, yet the pathway-specific mechanisms, particularly how typhoon tracks regulate N sources and transformations, remain unclear due to methodological limitations in distinguishing biotic and abiotic processes. Here, we employed nitrate (NO3-) dual isotopes (delta N-15-NO3- and delta O-18-NO3-) to study the distinct N cycling pathways in Zhanjiang Bay following two typhoons with contrasting landfall tracks. The results demonstrate that the typhoon track not only determines hydrodynamic patterns but also fundamentally alters the nature of N cycling. Specifically, different landfall tracks of typhoons lead to distinct N cycling patterns. For the left-side landfall typhoon (Lionrock), onshore winds established a salinity front that intensified sediment resuspension. The isotopic evidences revealed that this physical regime triggered adsorptive NO3- loss onto suspended particles, a quantitatively important but previously overlooked abiotic NO3- removal pathway during such events. Concurrently, source apportionment indicated that this physical retention mechanism trapped > 70 % of municipal sewage-derived NO3- within the bay. In contrast, the right-side landfall typhoon (Chaba) generated offshore winds, flushing the bay with terrestrial nutrients and stimulating intense phytoplankton blooms. The isotopic evidences suggested that phytoplankton assimilation is the dominant NO3- consumption process. Therefore, the typhoon track acts as a switch that flips between two distinct N fates, including physicochemical processes (dominated by the left-side landfall typhoon) and biological process (dominated by the right-side landfall typhoon). This N-centric framework provides actionable insights for coastal management, showing that left-side typhoons may exacerbate localized eutrophication risks from point sources, while right-side typhoons drive basin-wide biological responses.