Articles | Volume 18, issue 18
Biogeosciences, 18, 5035–5051, 2021
https://doi.org/10.5194/bg-18-5035-2021
Biogeosciences, 18, 5035–5051, 2021
https://doi.org/10.5194/bg-18-5035-2021
Research article
15 Sep 2021
Research article | 15 Sep 2021

Effect of organic carbon addition on paddy soil organic carbon decomposition under different irrigation regimes

Heleen Deroo et al.

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Short summary
We assessed if and how incorporation of exogenous organic carbon (OC) such as straw could affect decomposition of native soil organic carbon (SOC) under different irrigation regimes. Addition of exogenous OC promoted dissolution of native SOC, partly because of increased Fe reduction, leading to more net release of Fe-bound SOC. Yet, there was no proportionate priming of SOC-derived DOC mineralisation. Water-saving irrigation can retard both priming of SOC dissolution and mineralisation.
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