文献类型：期刊文献

英文题名：Tidal pumping modulates the dissolved organic carbon dynamics and exchange fluxes across the mangrove-fringed estuary-coast interface in Zhanjiang Bay, China

作者：Zhang, Peng[1];Lei, Jia[1];Zhou, Lin[1];Chen, Xiaoling[1];Yu, Haowen[1];Ye, Qing[1];Huang, Kaixin[1];Zhang, Jibiao[1]

机构：[1]Guangdong Ocean Univ, Coll Chem & Environm Sci, Zhanjiang 524088, Guangdong, Peoples R China

年份：2026

卷号：220

外文期刊名：MARINE ENVIRONMENTAL RESEARCH

收录：SCI-EXPANDED(收录号：WOS:001782456800001)、、EI(收录号：20262220781995)、Scopus(收录号：2-s2.0-105039881056)、WOS

基金：Thanks for the financial support provided by the Guangdong Basic and Applied Basic Research Foundation (2023A1515012769) , National College Student Innovation and Entrepreneurship Plan (202510566020) . Special thanks to reviewers for their careful review and constructive suggestions. Thanks to all members of the research team and others involved in this study.

语种：英文

外文关键词：Tidal pumping; Dissolved organic carbon; Colored dissolved organic matter; Estuary; Carbon cycling

外文摘要：Estuaries, as key interfaces between land and sea, play an important role in coastal carbon cycling. This study investigates how tidal pumping influences dissolved organic carbon (DOC) dynamics at the estuary-coastal interface of Zhanjiang Bay (ZJB). DOC concentrations were higher in the dry season than in the wet season, with mean values of 3.34 f 1.10 mg L-1and 2.82 f 0.83 mg L-1, respectively, and similar patterns were observed at the estuarine mixing zone (Site E2:3.68 mg L-1 and 2.58 mg L-1, respectively). It indicated enhanced retention and tidal remobilization of terrestrially influenced organic matter under low river discharge. Optical signatures revealed tidal-phase mediated DOM transformation: ebb tides export more aromatic, terrestrial-like DOM (SUVA254 = 10.28 f 4.42 L mg-1 m-1), while fluorescence components shift from terrestrial humic-like material upstream to microbial/protein-like material seaward. Net DOC flux across the monitored estuarine section showed persistent seaward transport, averaging approximately 0.14 f 0.01 t h-1 in the dry season and 0.27 f 0.02 t h-1 in the wet season. Overall, DOC dynamics in the ZJB estuary were influenced by terrestrial inputs and were closely coupled with tidal exchange and biogeochemical processes, providing insights into carbon cycling in mangrove-fringed estuarine systems.