水生态学杂志2025，Vol.46Issue(5)：129-138,10.DOI:10.15928/j.1674-3075.202407240002
粤东近岸海域表层沉积物碳、氮、磷分布规律及污染评价
Distribution and Evaluation of Carbon,Nitrogen and Phosphorus in Surface Sediments of the Nearshore Waters of East Guangdong Province
摘要
Abstract
In this study,we explored the distribution and pollution status of total organic carbon(TOC),total nitrogen(TN),and total phosphorus(TP)in surface sediments of the estuaries and nearshore waters of eastern Guangdong Province,aiming to provide a scientific basis for pollution reduction and environ-mental protection.In 2020 and 2021,surface sediment samples(0-5 cm)were collected at 114 stations for the determination of TOC,TN and TP and analysis of their correlations.The Nemero comprehensive pol-lution index and ecotoxicological methods were used to evaluate the pollution status.We also explored sources of organic matter to surface sediments and the changes in TOC,TN and TP content over the past 15 years.The contents of TOC,TN and TP in surface sediments were in the ranges of 0.05％-1.36％,0.006％-0.210％and 0.015％-0.112％,respectively.The distribution of TOC,TN and TP presented spa-tial heterogeneity,higher within bays and river estuaries than in other near-coastal areas,and gradually de-creasing with distance from the shore.In the study area,34.2％of the stations were classified as clean or above,65.8％of the stations were at levels of slight to moderate pollution,71.9％of the area was severely polluted by TN,meeting Class Ⅱ pollution standards,and 28.1％of the area was polluted by TOC and TP,categorized as Class Ⅰ pollution.The organic matter sources in the surface sediments of the study area were primarily marine-derived,as indicated by C/N ratios,with significant correlations among the ele-ments.Compared to historical data from the past 15 years,TOC and TN concentrations in the local area have decreased,while TP levels have increased.The C/N ratio has risen above 8,suggesting a shift to-ward mixed marine-terrestrial organic matter inputs.关键词
表层沉积物/总有机碳/总氮/总磷/分布特征/环境评价/粤东近岸海域Key words
surface sediments/total organic carbon/total nitrogen/total phosphorus/distribution characteris-tics/environmental assessment/nearshore waters of eastern Guangdong Province分类
海洋科学引用本文复制引用
林聪,蒋俊祎,侯中尧,王洋,王万虎,郭兴国,张云锺..粤东近岸海域表层沉积物碳、氮、磷分布规律及污染评价[J].水生态学杂志,2025,46(5):129-138,10.基金项目
中国地质调查局海洋与海岸带地质调查专项(DD20208013,DD20230415). （DD20208013,DD20230415）
