The effect of iron on the preservation of organic carbon in marine sediments and its implications for carbon sequestration

被引:0
|
作者
Limin Hu
Yuhan Ji
Bin Zhao
Xiting Liu
Jiazong Du
Yantao Liang
Peng Yao
机构
[1] Ocean University of China,College of Marine Geosciences, Key Laboratory of Submarine Geosciences and Prospecting Techniques, Ministry of Education
[2] Laboratory for Marine Geology,Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education
[3] Laoshan Laboratory,College of Marine Life Sciences
[4] Ocean University of China,undefined
[5] Ocean University of China,undefined
来源
Science China Earth Sciences | 2023年 / 66卷
关键词
Marine sedimentary organic carbon; Reactive iron minerals; Iron-bound organic carbon; Selective preservation; Carbon sequestration;
D O I
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中图分类号
学科分类号
摘要
Marine sediments are the most significant reservoir of organic carbon (OC) in Earth’s surface system. Iron, a crucial component of the marine biogeochemical cycle, has a considerable impact on marine ecology and carbon cycling. Understanding the effect of iron on the preservation of OC in marine sediments is essential for comprehending biogeochemical processes of carbon and climate change. This review summarizes the methods for characterizing the content and structure of iron-bound OC and explores the influencing mechanism of iron on OC preservation in marine sediments from two aspects: the selective preservation of OC by reactive iron minerals (iron oxides and iron sulfides) and iron redox processes. The selective preservation of sedimentary OC is influenced by different types of reactive iron minerals, OC reactivity, and functional groups. The iron redox process has dual effects on the preservation and degradation of OC. By considering sedimentary records of iron-bound OC across diverse marine environments, the role of iron in long-term preservation of OC and its significance for carbon sequestration are illustrated. Future research should focus on identifying effective methods for extracting reactive iron, the effect of diverse functional groups and marine sedimentary environments on the selective preservation of OC, and the mediation of micro-organisms. Such work will help elucidate the influencing mechanisms of iron on the long-term burial and preservation of OC and explore its potential application in marine carbon sequestration to maximize its role in achieving carbon neutrality.
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页码:1946 / 1959
页数:13
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