Articles | Volume 18, issue 18
https://doi.org/10.5194/bg-18-5035-2021
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, Masuda Akter, Samuel Bodé, Orly Mendoza, Haichao Li, Pascal Boeckx, and Steven Sleutel

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Cited articles

Akter, M., Deroo, H., De Grave, E., Van Alboom, T., Kader, M. A., Pierreux, S., Begum, M. A., Boeckx, P., and Sleutel, S.: Link between paddy soil mineral nitrogen release and iron and manganese reduction examined in a rice pot growth experiment, Geoderma, 326, 9–21, https://doi.org/10.1016/j.geoderma.2018.04.002, 2018. 
Bertora, C., Cucu, M. A., Lerda, C., Peyron, M., Bardi, L., Gorra, R., Sacco, D., Celi, L., and Said-Pullicino, D.: Dissolved organic carbon cycling, methane emissions and related microbial populations in temperate rice paddies with contrasting straw and water management, Agr. Ecosyst. Environ., 265, 292–306, https://doi.org/10.1016/j.agee.2018.06.004, 2018. 
Blagodatskaya, Å. and Kuzyakov, Y.: Mechanisms of real and apparent priming effects and their dependence on soil microbial biomass and community structure: critical review, Biol. Fert. Soils, 45, 115–131, 2008. 
Carrijo, D. R., Lundy, M. E., and Linquist, B. A.: Rice yields and water use under alternate wetting and drying irrigation: A meta-analysis, Field Crop Res, 203, 173–180, https://doi.org/10.1016/j.fcr.2016.12.002, 2017. 
Chao, T. and Zhou, L.: Extraction techniques for selective dissolution of amorphous iron oxides from soils and sediments, Soil Sci. Soc. Am. J., 47, 225–232, 1983. 
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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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