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| DOI | 10.1016/j.scitotenv.2023.169282 |
| Source identification of sedimentary organic carbon in coastal wetlands of the western Bohai Sea | |
| 发表日期 | 2024 |
| ISSN | 0048-9697 |
| EISSN | 1879-1026 |
| 起始页码 | 913 |
| 卷号 | 913 |
| 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. |
| 英文关键词 | Organic carbon; Sediment source; N-alkanes; Stable carbon isotope; Bohai Sea |
| 语种 | 英语 |
| WOS研究方向 | Environmental Sciences & Ecology |
| WOS类目 | Environmental Sciences |
| WOS记录号 | WOS:001154308500001 |
| 来源期刊 | SCIENCE OF THE TOTAL ENVIRONMENT
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| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/291020 |
| 作者单位 | Tianjin University; Fujian Normal University; Hong Kong University of Science & Technology; City University of Hong Kong; Chinese Academy of Sciences; Wuhan Institute of Rock & Soil Mechanics, CAS; Chinese Academy of Sciences; Yantai Institute of Coastal Zone Research, CAS; Tianjin Normal University; Chinese Academy of Sciences; Northeast Institute of Geography & Agroecology, CAS |
| 推荐引用方式 GB/T 7714 | . Source identification of sedimentary organic carbon in coastal wetlands of the western Bohai Sea[J],2024,913. |
| APA | (2024).Source identification of sedimentary organic carbon in coastal wetlands of the western Bohai Sea.SCIENCE OF THE TOTAL ENVIRONMENT,913. |
| MLA | "Source identification of sedimentary organic carbon in coastal wetlands of the western Bohai Sea".SCIENCE OF THE TOTAL ENVIRONMENT 913(2024). |
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