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Effects of Temperature on Methane Production and Oxidation During Laboratory Incubation of Sediments from Meiziya Reservoir, China

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Abstract

Methane (CH4) emissions from reservoir to the atmosphere depend on the balance of microbial CH4 production and oxidation, and temperature is an important factor to both processes by influencing directly the activity of microorganism. Six sediment cores of 30 cm were collected from the Meiziya Reservoir, China, a small water conservancy project with the maximum water depth of 9.7 m. The main input of reservoir was terrigenous organic matter, and the δ13C of organic matter in sediments ranged from − 27.5 to − 23.3‰. Using a self-made device for monitoring CH4 production rate, we measured the CH4 production and oxidation rates in sediment cores simultaneously at the range of 6–27 °C with an interval of 3 °C. The CH4 net production rates and oxidation rates in sediment cores varied in the range of (4.2–2489.0) × 10−3 µmol/L·h−1 and (16.0–1287.5) × 10−3 µmol/L·h−1, respectively. Increasing temperature enhanced the CH4 production and oxidation rates, and the former increased over temperature with an exponential trend. In the Meiziya Reservoir, a large proportion of CH4 (69.7–70.6%) that originated from sediments was depleted before escaping to the surface sediments. During the mineralization of organic matter in sediments, the release of CH4 accounted for 1.1–66.8% of gaseous carbon (calculated by the mass of C).

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The data used to support the findings of this study are available from the corresponding author upon request.

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Funding

This work was financially supported by the National Natural Science Foundation of China (grant number: 51979148); the Natural Science Foundation of Inner Mongolia Autonomous Region, China (grant number: 2020ZD0009); and Research and Development project of China Communications Construction Third Highway Engineering Co. Ltd (grant number: SGJKY-2022–01).

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Correspondence to Ye Li.

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Lei, D., Lei, M., Chen, M. et al. Effects of Temperature on Methane Production and Oxidation During Laboratory Incubation of Sediments from Meiziya Reservoir, China. Water Air Soil Pollut 235, 206 (2024). https://doi.org/10.1007/s11270-024-07005-8

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  • DOI: https://doi.org/10.1007/s11270-024-07005-8

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