Organic carbon preservation by reactive iron oxides in South Yellow Sea sediments

Tao Jing; Ma Weiwei; Li Wenjun; Li Tie; Zhu Maoxu

doi:10.3969/j.issn.0253-4193.2017.08.002

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Tao Jing, Ma Weiwei, Li Wenjun, Li Tie, Zhu Maoxu. Organic carbon preservation by reactive iron oxides in South Yellow Sea sediments[J]. Haiyang Xuebao, 2017, 39(8): 16-24. doi: 10.3969/j.issn.0253-4193.2017.08.002

Citation:

Tao Jing, Ma Weiwei, Li Wenjun, Li Tie, Zhu Maoxu. Organic carbon preservation by reactive iron oxides in South Yellow Sea sediments[J]. Haiyang Xuebao, 2017, 39(8): 16-24. doi: 10.3969/j.issn.0253-4193.2017.08.002

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Organic carbon preservation by reactive iron oxides in South Yellow Sea sediments

doi: 10.3969/j.issn.0253-4193.2017.08.002

College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China

Received Date: 2016-12-07
Rev Recd Date: 2017-02-22

Abstract

Abstract

Sorption of organic carbon (OC) on reactive iron (FeR) plays an important role in OC stabilization and preserving in sediments and soils, and thus can buffer the concentration of atmospheric CO₂ on geological timescales. Based on the amount of OC associated with FeR (Fe-OC) in three cores from the South Yellow Sea determined by the dithionite reduction extraction, we quantitatively investigated the role of FeR in OC stabilization, mechanisms of OC and FeR association, and variation of Fe-OC with depth. Our results showed that Fe-OC accounted for (13.2±7.47)% of sedimentary total OC in the South Yellow Sea. This means that annually 0.72 Mt of OC buried in the sediments is sequestered by FeR, which is 0.44% of the global OC buried in the continental shelf sea annually. Molar ratios of OC to FeR (average 4.50±2.61) indicate that coprecipitation of OC with FeR plays an important role in OC stabilization, and the ratios increased with an increase in fractions of marine OC in the sediments. Stable isotopic compositions of Fe-OC (δ¹³C_Fe-OC) suggested that more labile OC is preferentially trapped by FeR, but this preferential trend decreases with an increase in OC/Fe ratio. No obvious changes in f_Fe-OCand δ¹³C_Fe-OC with depth were observed, which can be ascribed to low degradability of organic matter and consequently weak iron reduction.
- reactive iron oxides,
- organic carbon protection,
- marine sediments,
- sorption,
- South Yellow Sea

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