首页|Distribution and Sources of Organic Matter in Surface Sediments of the Karachi Coast,Pakistan

Distribution and Sources of Organic Matter in Surface Sediments of the Karachi Coast,Pakistan

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Under the steadily intensifying human activities in coastal areas,it is crucial to distinguish the sources of organic matter(OM)in sediments for better understanding of the environmental change.In this study,25 surface sediments collected along the har-bor and creeks areas off Karachi coast were used for total organic carbon(TOC),total nitrogen(TN),stable carbon(δ13C)and nitro-gen(δ15N)isotopic compositions,phytoplankton biomarkers(brassicasterol,dinosterol and cholesterol)and glycerol dialkyl glycerol tetraethers(GDGTs)analyses,to trace the distribution of OM and identify its sources.TOC,TN,δ13C,and δ15N are in the range of 0.04%to 5.28%,0.01%to 0.57%,-17.55‰ to-26.31‰,and 2.83‰ to 6.04‰,respectively.C/N values range from 4.24 to 21.04.The δ13C,δ15N,C/N,BIT(Branched Isoprenoid Tetraether)index together with phytoplankton biomarkers show both marine and terrestrial OM input to the creeks and Harbor stations.In contrast,the stations from Western Coast indicate a marine source pre-dominance.A clearly impact of human activities is seen from sediments near river mouths.

surface sedimentsorganic matterstable carbon and nitrogen isotopesbiomarkersKarachi coast

KAHKASHAN Sanober、LI Zhongqiao、JALALI Bassem、WANG Xinhong、INAM Asif、SALEEM Monawwar、AFTAB Javed、JI Zhongqiang、BAI Youcheng、RAN Lihua、LI Hongliang、CHEN Jianfang

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Key Laboratory of Marine Ecosystem Dynamics,Second Institute of Oceanography,Ministry of Natural Resources,Hangzhou 310012,China

State Key Laboratory of Marine Environmental Science,College of the Environment and Ecology,Xiamen Univer-sity,Xiamen 361005,China

National Institute of Oceanography,Clifton,Block-1,Karachi,Pakistan

Bahria School of Maritime and Applied Sciences,Bahria University Karachi Campus,Karachi,Pakistan

Observation and Research Station of Yangtze River Delta Marine Ecosystems,Ministry of Natural Resources,Zhoushan 361000,China

Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai),Zhuhai 519000,China

State Key Laboratory of Satellite Ocean Environment Dynamics,Second Institute of Oceanography,Ministry of Natural Resources,Hangzhou 310061,China

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2024

10.1007/s11802-024-5688-8

中国海洋大学学报(自然科学英文版)
中国海洋大学

中国海洋大学学报(自然科学英文版)

CSTPCD
影响因子：0.268
ISSN：1672-5182
年,卷(期)：2024.23(6)