文献类型：期刊文献

英文题名：Human-driven spatial and temporal contrasts in dissolved organic matter from submarine groundwater discharge and river runoff to Zhanjiang Bay, northern South China sea

作者：Wang, Chao[1,2,3,4,5];Jiang, Kuan[1,5];Wang, Xin[2];Huang, Peng[1,3,4];Liu, Pengfei[1,5];Chen, Fajin[1,3,4];Jin, Guangzhe[1,3,4]

机构：[1]Guangdong Ocean Univ, Coll Ocean & Meteorol, Zhanjiang, Peoples R China;[2]Minist Ecol & Environm Peoples Republ China, Key Lab Water Environm Simulat & Pollut Control, Beijing, Peoples R China;[3]Guangdong Ocean Univ, Coll Ocean & Meteorol, Lab Coastal Ocean Variat & Disaster Predict, Zhanjiang, Peoples R China;[4]Guangdong Ocean Univ, Dept Educ Guangdong Prov, Key Lab Climate Resources & Environm Continental S, Zhanjiang, Peoples R China;[5]Guangdong Ocean Univ, Coll Chem & Environm Sci, Zhanjiang, Peoples R China

年份：2025

卷号：210

外文期刊名：MARINE ENVIRONMENTAL RESEARCH

收录：SCI-EXPANDED(收录号：WOS:001529533900002)、、EI(收录号：20252718723945)、Scopus(收录号：2-s2.0-105009609510)、WOS

基金：This study was supported by the Guangdong Basic and Applied Basic Research Foundation, China (Grant No. 2022A1515110946) , the Open Fund of The Key Laboratory of Water Environment Simulation and Pollution Control, Ministry of Ecology and Environment of the People's Republic of China (Grant No. WESPC202405) , the Tropical Ocean environment in Western Coastal Waters Observation and Research Station of Guangdong Province, China (Grant No. 2024B1212040008) , and the scientific research start-up fund of Guangdong Ocean University, China (Grant No. 060302032009) . The authors would like to thank Ziyang Shi and Yuanhao Zeng for their assistance with field sampling and laboratory analysis.

语种：英文

外文关键词：Zhanjiang Bay; Groundwater; River water; Dissolved organic carbon; Colored dissolved organic matter; Fluorescent dissolved organic matter

外文摘要：Accurately estimating coastal carbon budgets requires a comprehensive understanding of dissolved organic matter (DOM) inputs from both groundwater discharge and river runoff, particularly in small, human-impacted tropical watersheds. This study provides a representative watershed surrounding Zhanjiang Bay in the northern South China Sea to broaden current knowledge in this field. By characterizing the spatiotemporal dynamics of water quality parameters, dissolved organic carbon (DOC), and both chromophoric and fluorescent DOM (CDOM and FDOM), we identified key patterns in DOM composition, sources, fluxes, and human-induced shifts. DOM in groundwater and river water around Zhanjiang Bay exhibited pronounced spatial heterogeneity but limited seasonal variation. Principal component and Cluster analyses identified three distinct groups. Cluster 1 represents shallow, oxygen-rich groundwater systems from cultivated land and artificial surfaces, with low DOM and microbially processed features. Cluster 2 comprises low-oxygen groundwater from grassland and wetland areas, marked by elevated DOC and humic-like FDOM, reflecting stronger terrestrial and anthropogenic inputs. Cluster 3 includes three rivers from urbanized catchments, enriched in DOC and protein-like FDOM from both anthropogenic and biological sources. Despite comparable water volumes, groundwater contributed less labile DOM flux than rivers. Riverine DOM showed a shift toward DOC-rich but CDOM-poor signature under human influence, deviating from natural tropical patterns and becoming similar to those of anthropogenically impacted rivers in northern China, indicating reduced stability and long-term carbon storage potential in marginal seas.