文献类型：期刊文献

英文题名：Unveiling the eutrophication crisis: 20 years of nutrient development in Zhanjiang Bay, China

作者：Liang, Haorui[1,2];Zhang, Junxiao[1,2];Zhang, Jibiao[3];Zhang, Peng[3];Deng, Xue[4];Chen, Jiyu[1,2];Wang, Zhiliang[1,2];Long, Chao[5];Lu, Chuqian[6,7];Wang, Di[1,2];Liang, Yuzhao[1,2]

机构：[1]Minist Nat Resources, South China Sea Marine Survey Ctr, Guangzhou, Peoples R China;[2]Minist Nat Resources, Key Lab Marine Environm Survey Technol & Applicat, Guangzhou, Peoples R China;[3]Guangdong Ocean Univ, Coll Chem & Environm Sci, Zhanjiang, Peoples R China;[4]Natl Marine Environm Monitoring Ctr, State Environm Protect Key Lab Coastal Ecosyst, Dalian, Peoples R China;[5]Chinese Acad Sci, South China Sea Inst Oceanol, Marine Environm Engn Ctr, Guangzhou, Peoples R China;[6]State Ocean Adm, South China Sea Environm Monitoring Ctr, Guangzhou, Peoples R China;[7]Nansha Isl Coral Reef Ecosyst Natl Observat & Res, Hainan, Peoples R China

年份：2024

卷号：11

外文期刊名：FRONTIERS IN MARINE SCIENCE

收录：SCI-EXPANDED(收录号：WOS:001247914800001)、、Scopus(收录号：2-s2.0-85196100324)、WOS

基金：We are grateful for the reviewers' careful review and valuable suggestions to improve the manuscript. We thank all members of the research team and others who participated in this study.

语种：英文

外文关键词：eutrophication; nutrient dynamics; annual variation; coastal; Zhanjiang Bay

外文摘要：Coastal eutrophication is a major issue of marine pollution. The main factors controlling eutrophication must be identified to ensure effective marine environmental management according to the respective local conditions. Zhanjiang Bay (ZJB), located northwest of the South China Sea, is a semi-closed bay influenced by complex water flows and the development of surrounding cities. In this study, we investigated the development of nutrient concentrations and compositions in ZJB seawater over the past 20 years and the factors influencing eutrophication based on several field investigations from 2006 to 2022 and historical data. High concentrations of dissolved inorganic phosphorus (DIP) and dissolved inorganic nitrogen (DIN) were the main contributors to the severe long-term eutrophication in ZJB; however, light eutrophication was observed in the outer bay, primarily caused by chemical oxygen demand (COD) and DIP. The primary sources of COD and nutrients were riverine freshwater, sewage outfalls, mariculture and domestic effluents carried by rivers. Tidal effects diluted the nutrient concentrations in the bay with seawater from the outer bay, thereby playing a key role in nutrient redistribution. The DIN: DIP ratio of ZJB showed long-term nitrogen restriction and excess phosphorus, primarily owing to mariculture activities. Marine undertakings can exert various impacts on water quality. Eliminating illegal aquaculture and launching aquaculture tailwater treatment can improve water quality, whereas practices such as channel dredging may worsen it. This study demonstrates the intricate dynamics of the ZJB ecosystem and offers valuable insights for effective environmental management and conservation efforts.