文献类型：期刊文献

英文题名：Human-driven nutrient structure shifts as a new driver of coastal deoxygenation: Evidence from long-term observations in a bay with frequent human activities

作者：Ca, Shangjun[1,2];Liu, Sihai[1,2];Lao, Qibin[1,2,7];Chen, Chunqing[1,2];Jiang, Chen[3];Lu, Xuan[4];Jin, Guangzhe[1,5,6];Zhu, Qingmei[1,5,6];Chen, Fajin[1,2,5,6]

机构：[1]Guangdong Ocean Univ, Coll Ocean & Meteorol, 1 Haida Rd, Zhanjiang 524088, Guangdong, Peoples R China;[2]Guangdong Ocean Univ, Sch Chem & Environm, Zhanjiang 524088, Peoples R China;[3]Beijing Inst Appl Meteorol, Beijing 100029, Peoples R China;[4]Jimei Univ, Polar & Marine Res Inst, Coll Harbor & Coastal Engn, Xiamen 361021, Peoples R China;[5]Guangdong Ocean Univ, Key Lab Coastal Ocean Variat & Disaster Predict, Zhanjiang 524088, Peoples R China;[6]Guangdong Ocean Univ, Dept Educ Guangdong Prov, Key Lab Climate Resources & Environm Continental S, Zhanjiang 524088, Peoples R China;[7]Minist Nat Resources, Inst Oceanog 2, Key Lab Marine Ecosyst Dynam, Hangzhou 310012, Peoples R China

年份：2025

卷号：220

外文期刊名：MARINE POLLUTION BULLETIN

收录：SCI-EXPANDED(收录号：WOS:001532847200003)、、EI(收录号：20252818761148)、Scopus(收录号：2-s2.0-105010225845)、WOS

基金：This study was supported by the National Natural Science Foundation of China (42276047, U1901213) , Guangdong Basic and Applied Basic Research Foundation (2024A1515110183) and Key Laboratory of Marine Ecosystem Dynamics, MNR (MED202404) .

语种：英文

外文关键词：Deoxygenation; Nutrient; Eutrophication; Zhanjiang Bay

外文摘要：In many published studies, eutrophication of coastal bays often leads to the degradation of large amounts of organic matter, which consumes dissolved oxygen (DO) in the water, thereby causing hypoxia or oxygen depletion. In fact, deoxygenation may also be related to changes in phytoplankton photosynthesis driven by alterations in nutrient structure. However, to date, few research has focused on the relationship between changes in nutrient structure and deoxygenation. This study involved 51 monthly cruises in Zhanjiang Bay, northwest of the South China Sea from 2017 to 2021 to explore the long-term relationship between nutrient structure and deoxygenation in coastal bays. Results found that nutrient structure in Zhanjiang Bay underwent significant changes during this period, characterized by accumulation of dissolved inorganic nitrogen (DIN) and depletion of dissolved inorganic phosphorus (DIP). These changes are attributed to accelerated urbanization in surrounding areas, the implementation of phosphorus-limiting policies, and the promotion of the use of phosphorus-free products. However, these shifts did not significantly alter the eutrophication index (EI), and a progressive decline in DO levels was still observed in Zhanjiang Bay. After excluding physical and certain biogeochemical processes linked to DO changes, the study found that alterations in nutrient structure suppressed the proliferation of fast-metabolizing algal species, thereby leading to the observed deoxygenation in Zhanjiang Bay. The present findings offer insights into a new mechanism for deoxygenation in coastal bays, contributing to a more comprehensive understanding of hypoxia in estuarine systems.