Source identification of sedimentary organic carbon in coastal wetlands of the western Bohai Sea

doi:10.1016/j.scitotenv.2023.169282

	Source identification of sedimentary organic carbon in coastal wetlands of the western Bohai Sea
	Zhang, Juqin 1; Hao, Qian 1; Li, Qiang 1; Zhao, Xiangwei 1; Fu, Xiaoli 1; Wang, Weiqi 2; He, Ding 3,4,5; Li, Yuan 6; Zhang, Zhenqing 7,8; Zhang, Xiaodong 1
刊名	SCIENCE OF THE TOTAL ENVIRONMENT
	2024-02-25
卷号	913 页码:12
关键词	Organic carbon Sediment source N-alkanes Stable carbon isotope Bohai Sea
ISSN号	0048-9697
DOI	10.1016/j.scitotenv.2023.169282
通讯作者	Hao, Qian(haoqian@tju.edu.cn) ; Zhang, Xiaodong(xiaodongzhang521@tju.edu.cn)
英文摘要	Coastal wetlands play a vital role in mitigating climate change, yet the characteristics of buried organic carbon (OC) and carbon cycling are limited due to difficulties in assessing the composition of OC from different sources (allochthonous vs. autochthonous). In this study, we analyzed the total organic carbon (TOC) to total nitrogen (TN) ratio (C/N), stable carbon isotope (delta 13C) composition, and n-alkane content to distinguish different sources of OC in the surface sediments of the coastal wetlands on the western coast of the Bohai Sea. The coupling of the C/N ratio with delta 13C and n-alkane biomarkers has been proved to be an effective tool for revealing OC sources. The three end-member Bayesian mixing model based on coupling C/N ratios with delta 13C showed that the sedimentary OC was dominated by the contribution of terrestrial particulate organic matter (POM), followed by freshwater algae and marine phytoplankton, with relative contributions of 47 +/- 21 %, 41 +/- 18 % and 12 +/- 17 %, respectively. The relative contributions of terrestrial plants, aquatic macrophytes and marine phytoplankton assessed by n-alkanes were 56 +/- 8 %, 35 +/- 9 % and 9 +/- 5 % in the study area, respectively. The relatively high salinity levels and strong hydrodynamic conditions of the Beidagang Reservoir led to higher terrestrial plants source and lower aquatic macrophytes source than these of Qilihai Reservoir based on the assessment of n-al- kanes. Both methods showed that sedimentary OC was mainly derived from terrestrial sources (plant -domi- nated), suggesting that vegetation plays a crucial role in storing carbon in coastal wetlands, thus, the coastal vegetation management needs to be strengthened in the future. Our findings provide insights into the origins and dynamics of OC in coastal wetlands on the western coast of the Bohai Sea and a significant scientific basis for future monitoring of the blue carbon budget balance in coastal wetlands.
WOS关键词	PEARL RIVER ESTUARY ; SURFACE SEDIMENTS ; SOURCE APPORTIONMENT ; CLIMATE-CHANGE ; N-ALKANES ; MATTER ; LAKE ; DELTA-C-13 ; BIOMARKER ; NITROGEN
WOS研究方向	Environmental Sciences & Ecology
语种	英语
WOS记录号	WOS:001154308500001
资助机构	National Natural Science Foundation of China ; Research Grants Council of Hong Kong ; State Key Laboratory of Geomechanics and Geotechnical Engineering ; Center for Ocean Research in Hong Kong and Macau
内容类型	期刊论文
源URL	[http://ir.yic.ac.cn/handle/133337/34851]
专题	中国科学院烟台海岸带研究所
通讯作者	Hao, Qian; Zhang, Xiaodong
作者单位	1.Tianjin Univ, Inst Surface Earth Syst Sci, Sch Earth Syst Sci, Tianjin 300072, Peoples R China 2.Fujian Normal Univ, Key Lab Humid Subtrop Ecogeog Proc, Minist Educ, Fuzhou 350117, Peoples R China 3.Hong Kong Univ Sci & Technol, Ctr Ocean Res Hong Kong & Macau, Dept Ocean Sci, Hong Kong, Peoples R China 4.City Univ Hong Kong, State Key Lab Marine Pollut, Hong Kong, Peoples R China 5.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China 6.Chinese Acad Sci, Yantai Inst Coastal Zone Res YIC, CAS Key Lab Coastal Environm Proc & Ecol Remediat, Shandong Key Lab Coastal Environm Proc, Yantai 264003, Peoples R China 7.Tianjin Normal Univ, Sch Geog & Environm Sci, Tianjin Key Lab Water Resources & Environm, Tianjin 300387, Peoples R China 8.Chinese Acad Sci, Northeast Inst Geog & Agroecol, Key Lab Wetland Ecol & Environm, Changchun 130102, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Juqin,Hao, Qian,Li, Qiang,et al. Source identification of sedimentary organic carbon in coastal wetlands of the western Bohai Sea[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2024,913:12.
APA	Zhang, Juqin.,Hao, Qian.,Li, Qiang.,Zhao, Xiangwei.,Fu, Xiaoli.,...&Song, Zhaoliang.(2024).Source identification of sedimentary organic carbon in coastal wetlands of the western Bohai Sea.SCIENCE OF THE TOTAL ENVIRONMENT,913,12.
MLA	Zhang, Juqin,et al."Source identification of sedimentary organic carbon in coastal wetlands of the western Bohai Sea".SCIENCE OF THE TOTAL ENVIRONMENT 913(2024):12.