Nonmicrobial mechanisms dominate the release of CO₂ and the decomposition of organic matter during the short-term redox process in paddy soil slurry.

ABSTRACT: Both biotic and abiotic mechanisms play a role in soil CO₂ emission processes. However, abiotically mediated CO₂ emission and the role of reactive oxygen species are still poorly understood in paddy soil. This study revealed that •OH promoted CO₂ emission in paddy soil slurries during short-term oxidation (4 h). •OH generation was highly hinged on active Fe(II) content, and the •OH contribution to CO₂ efflux was 10%-33% in topsoil and 40%-77% in deep-soil slurries. Net CO₂ efflux was higher in topsoil slurries, which contained more dissolved organic carbon (DOC). CO₂ efflux correlated well with DOC contents, suggesting the critical role of DOC. Microbial mechanisms contributed 9%-45% to CO₂ production, as estimate

SUBMITTER: Liu J 

PROVIDER: S-EPMC10902510 | biostudies-literature | 2023 Dec

REPOSITORIES: biostudies-literature