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Linear relationship between CH4 fluxes and atmospheric CO2 concentration levels controlled by rice biomass and soil methanogenic communities
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Linear relationship between CH4 fluxes and atmospheric CO2 concentration levels controlled by rice biomass and soil methanogenic communities
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Journal Article
Linear relationship between CH4 fluxes and atmospheric CO2 concentration levels controlled by rice biomass and soil methanogenic communities
2023
Overview
The contribution of CH
4
emissions from paddy soils to greenhouse gas emissions is key in the evaluation of future climate change scenarios. Most studies in this field have investigated the effects of elevated CO
2
concentrations (e[CO
2
]s) on CH
4
fluxes and methanogenic communities in paddy soils under constant CO
2
concentrations ([CO
2
]s). However, atmospheric [CO
2
] is gradually increasing and the relationship between future climate change and CH
4
emissions from paddy fields is poorly understood. This study explored the responses of CH
4
fluxes and methanogenic communities in paddy soils to different e[CO
2
]s using open-top chambers. The rice biomass, CH
4
fluxes, methane production potential, and methanogenic characteristics were analyzed under CK (ambient [CO
2
]), C
1
(e[CO
2
] by 120 µmol mol
–1
), and C
2
(e[CO
2
] by 200 µmol mol
–1
) treatments. The results indicated that the C
1
and C
2
treatments insignificantly increased the CH
4
flux in paddy fields. However, the C
1
treatment significantly increased the CH
4
flux/biomass at the elongation stage, while the C
2
treatment significantly increased the CH
4
flux/biomass at all of the growth stages. The C
1
and C
2
treatments had a positive effect on both methane production potential and methanogenic abundance at all of the growth stages, but this effect was not always significant. In addition, the C
1
and C
2
treatments significantly altered the methanogenic community structure at the elongation stage. Notably, there was a significant linear relationship between the CH
4
flux/biomass and [CO
2
] at all of the growth stages; between the methane production potential and [CO
2
] at the tillering, elongation, and milk-ripening stages; and between the
mcrA g
ene abundance and [CO
2
] at the milk-ripening stage. A linear model based on rice biomass, methane production potential, and soil DOC concentration explained 72.7% of the variation in the CH
4
fluxes. Overall, the linear relationship between CH
4
fluxes and atmospheric [CO
2
] levels was controlled by the rice biomass, soil carbon substrate, and methanogenic communities.
