Source characteristics and quantitative estimates of organic carbon composition in the intertidal zones of Jiaozhou Bay, China.

IF 5.3 3区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES
Marine pollution bulletin Pub Date : 2025-01-01 Epub Date: 2024-11-27 DOI:10.1016/j.marpolbul.2024.117338
Ke Liu, Jie Fu, Li Li, Daolai Zhang, Xiaotong Xiao
{"title":"Source characteristics and quantitative estimates of organic carbon composition in the intertidal zones of Jiaozhou Bay, China.","authors":"Ke Liu, Jie Fu, Li Li, Daolai Zhang, Xiaotong Xiao","doi":"10.1016/j.marpolbul.2024.117338","DOIUrl":null,"url":null,"abstract":"<p><p>The Jiaozhou Bay (JZB) intertidal zone is a significant carbon reservoir that plays a crucial role in transporting and accumulating organic matter; however, quantitative studies of organic matter sources are scarce. In this study, we present bulk parameters of total organic carbon (TOC), TOC/TN, δ<sup>13</sup>C, and biomarker contents in 36 surface sediment samples from the JZB intertidal zones to quantify the contribution of organic carbon (OC) derived from terrestrial/marine sources, such as C<sub>3</sub> plants, C<sub>4</sub> plants, estuarine productivity, sewage outlets, and marine productivity. The results demonstrated that a two-end-member model based on the traditional indicators of TOC/TN or δ<sup>13</sup>C is not appropriate for quantifying the OC source. The presence of C<sub>3</sub> plants, C<sub>4</sub> plants, and sewage outlets in the JZB intertidal zone could lead to errors in determining OC contribution when solely using TOC/TN or δ<sup>13</sup>C. A classical mixing diagram (three-end-member model) utilizing TOC/TN and δ<sup>13</sup>C values revealed that OC contribution was dominated by marine productivity throughout the intertidal zone. In the west, the average OC contribution from marine productivity, estuarine productivity, and C<sub>4</sub> plants was 73.8 %, 14.2 %, and 12.0 %, respectively. In the east, the average OC contribution from marine productivity, estuarine productivity, and sewage outlets was 57.6 %, 24.9 %, and 17.4 %, respectively. The higher OC contribution from marine productivity in the west was attributed to the occurrence of Spartina alterniflora, while the OC contribution from estuarine productivity in the east was primarily due to the presence of more rivers flowing into the JZB compared to the west. By combining biomarkers and OC contents, a significant positive relationship verified the suitability of the end-member values selected for the three-end-member mixing model in the west and east intertidal zones of JZB. This finding was further supported by principal component analysis (PCA) analyses of these proxies. This study demonstrated that OC sources in intertidal zones varied among contrasting coastal environmental conditions and addressed the knowledge gap regarding biogeochemical cycles and ecological protection in the JZB intertidal zones.</p>","PeriodicalId":18215,"journal":{"name":"Marine pollution bulletin","volume":"210 ","pages":"117338"},"PeriodicalIF":5.3000,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Marine pollution bulletin","FirstCategoryId":"93","ListUrlMain":"https://doi.org/10.1016/j.marpolbul.2024.117338","RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"2024/11/27 0:00:00","PubModel":"Epub","JCR":"Q1","JCRName":"ENVIRONMENTAL SCIENCES","Score":null,"Total":0}
引用次数: 0

Abstract

The Jiaozhou Bay (JZB) intertidal zone is a significant carbon reservoir that plays a crucial role in transporting and accumulating organic matter; however, quantitative studies of organic matter sources are scarce. In this study, we present bulk parameters of total organic carbon (TOC), TOC/TN, δ13C, and biomarker contents in 36 surface sediment samples from the JZB intertidal zones to quantify the contribution of organic carbon (OC) derived from terrestrial/marine sources, such as C3 plants, C4 plants, estuarine productivity, sewage outlets, and marine productivity. The results demonstrated that a two-end-member model based on the traditional indicators of TOC/TN or δ13C is not appropriate for quantifying the OC source. The presence of C3 plants, C4 plants, and sewage outlets in the JZB intertidal zone could lead to errors in determining OC contribution when solely using TOC/TN or δ13C. A classical mixing diagram (three-end-member model) utilizing TOC/TN and δ13C values revealed that OC contribution was dominated by marine productivity throughout the intertidal zone. In the west, the average OC contribution from marine productivity, estuarine productivity, and C4 plants was 73.8 %, 14.2 %, and 12.0 %, respectively. In the east, the average OC contribution from marine productivity, estuarine productivity, and sewage outlets was 57.6 %, 24.9 %, and 17.4 %, respectively. The higher OC contribution from marine productivity in the west was attributed to the occurrence of Spartina alterniflora, while the OC contribution from estuarine productivity in the east was primarily due to the presence of more rivers flowing into the JZB compared to the west. By combining biomarkers and OC contents, a significant positive relationship verified the suitability of the end-member values selected for the three-end-member mixing model in the west and east intertidal zones of JZB. This finding was further supported by principal component analysis (PCA) analyses of these proxies. This study demonstrated that OC sources in intertidal zones varied among contrasting coastal environmental conditions and addressed the knowledge gap regarding biogeochemical cycles and ecological protection in the JZB intertidal zones.

中国胶州湾潮间带有机碳组成的来源特征和定量估算。
胶州湾潮间带是一个重要的碳库,对有机质的迁移和积累起着至关重要的作用;然而,对有机质来源的定量研究却很少。本研究给出了36个潮间带表层沉积物样品的总有机碳(TOC)、TOC/TN、δ13C和生物标志物含量等大体积参数,以量化C3植物、C4植物、河口生产力、污水排放口和海洋生产力等陆源/海源有机碳(OC)的贡献。结果表明,基于 TOC/TN 或 δ13C 等传统指标的两端成员模型并不适合量化 OC 来源。江浙沪潮间带存在 C3 植物、C4 植物和污水排放口,如果仅使用 TOC/TN 或 δ13C,可能会导致在确定 OC 贡献时出现误差。利用 TOC/TN 和 δ13C 值绘制的经典混合图(三端成员模型)显示,整个潮间带的 OC 含量主要由海洋生产力决定。在西部,海洋生产力、河口生产力和 C4 植物的平均 OC 贡献率分别为 73.8%、14.2% 和 12.0%。在东部,海洋生产力、河口生产力和污水排放口的平均 OC 贡献率分别为 57.6%、24.9% 和 17.4%。西部海洋生产力的 OC 含量较高,这主要是由于这里生长着交替花斯巴达,而东部河口生产力的 OC 含量较高,这主要是由于流入江浙沪的河流比西部多。通过将生物标志物与 OC 含量结合起来,一个显著的正相关关系验证了三端分子混合模型所选端分子值在珠江口西岸和东岸潮间带的适用性。对这些代用指标进行的主成分分析(PCA)进一步证实了这一结论。该研究表明,潮间带的 OC 来源在不同的海岸环境条件下存在差异,弥补了有关江浙沪潮间带生 物地球化学循环和生态保护方面的知识空白。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
求助全文
约1分钟内获得全文 求助全文
来源期刊
Marine pollution bulletin
Marine pollution bulletin 环境科学-海洋与淡水生物学
CiteScore
10.20
自引率
15.50%
发文量
1077
审稿时长
68 days
期刊介绍: Marine Pollution Bulletin is concerned with the rational use of maritime and marine resources in estuaries, the seas and oceans, as well as with documenting marine pollution and introducing new forms of measurement and analysis. A wide range of topics are discussed as news, comment, reviews and research reports, not only on effluent disposal and pollution control, but also on the management, economic aspects and protection of the marine environment in general.
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术官方微信