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Carbon sequestration in paddy soils: Contribution and mechanisms of mineral-associated SOC formation by Cuiyun Niu; Liping Weng; Wanli Lian; Ran Zhang; Jie Ma; Yali Chen is a Environmental Science article available to read on EtoBox.

What is Carbon sequestration in paddy soils: Contribution and mechanisms of mineral-associated SOC formation about?

In this work, comparative study of paddy and upland soils were carried out to unravel mechanisms of enhanced soil organic carbon (SOC) sequestration in paddy soils using fractionation methods, 13C NMR and Nano-SIMS analysis, as well as organic layer thickness calculations (Core-Shell model). The results showed that although there is a strong increase in particulate SOC in paddy soils compared to that in the upland soils, the increase in mineral-associated SOC is more important, explaining 60–75% of SOC increase in the paddy soils. In the wet and dry alternate cycles of paddy soil, iron (hydr)oxides adsorb relatively small and soluble organic molecules (fulvic acid-like), promote catalytic oxidation and polymerization, thus accelerating formation of larger organic molecules. Upon reductive iron dissolution, these molecules are released and incorporated into existing less soluble organic compounds (humic acid or humin-like), which are coagulated and associated with clay minerals, becoming part of the mineral-associated SOC. The functioning of this “iron wheel” process stimulates accumulation of relatively young SOC into mineral-associated organic carbon pool, and reduces the differen

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Author

Cuiyun Niu; Liping Weng; Wanli Lian; Ran Zhang; Jie Ma; Yali Chen

Publisher

Elsevier BV

Published

2023

Language

EN

Field

Environmental Science (Physical Sciences)