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Zhu, Xinshu, Deng, Yongcui, Hernández, Marcela 
ORCID: https://orcid.org/0000-0002-1041-785X, Fang, Jie, Xing, Peng and Liu, Yongqin
(2023)
Distinct responses of soil methanotrophy in hummocks and hollows to simulated glacier meltwater and temperature rise in Tibetan glacier foreland.
Science of the Total Environment, 862.
ISSN 0048-9697
Abstract
Glacier foreland soils are known to be essential methane (CH 4) consumers. However, global warming and increased glacier meltwater have turned some foreland meadows into swamp meadows. The potential impact of this change on the function of foreland soils in methane consumption remains unclear. Therefore, we collected Tibetan glacier foreland soils in the non-melting season from typical microtopography in swamp meadows (hummock and hollow). Three soil moisture conditions (moist, saturated, and submerged) were set by adding glacier runoff water. Soil samples were then incubated in the laboratory for two weeks at 10 °C and 20 °C. About 5 % of 13CH 4/ 12CH 4 was added to the incubation bottles, and daily methane concentrations were measured. DNA stable isotope probing (DNA-SIP) and high-throughput sequencing were combined to target the active methanotroph populations. The results showed that type Ia methanotrophs, including Crenothrix, Methylobacter, and an unclassified Methylomonadaceae cluster, actively oxidized methane at 10 °C and 20 °C. There were distinct responses of methanotrophs to soil moisture rises in hummock and hollow soils, resulting in different methane oxidation potentials. In both hummock and hollow soils, the methane oxidation potential was positively correlated with temperature. Furthermore, saturated hummock soils exhibited the highest methane oxidation potential and methanotroph populations, while submerged hollow soils had the lowest. This suggests that the in-situ hummock soils, generally saturated with water, are more essential than in-situ hollows, typically submerged in water, for alleviating the global warming potential of swamp meadows in the Tibetan glacier foreland during the growing season.
| Item Type: | Article |
|---|---|
| Additional Information: | Funding Information: This research was funded by the National Natural Science Foundation of China (Grant No. 41971077 ) and the Second Tibetan Plateau Scientific Expedition and Research (STEP) program (Grant No. 2019QZKK0503 ). Publisher Copyright: © 2022 Elsevier B.V. |
| Uncontrolled Keywords: | dna-sip,glacier foreland,methane,methanotrophs,tibetan plateau,environmental engineering,environmental chemistry,waste management and disposal,pollution ,/dk/atira/pure/subjectarea/asjc/2300/2305 |
| Faculty \ School: | Faculty of Science > School of Biological Sciences |
| UEA Research Groups: | Faculty of Science > Research Groups > Molecular Microbiology |
| Related URLs: | |
| Depositing User: | LivePure Connector |
| Date Deposited: | 07 Nov 2024 18:30 |
| Last Modified: | 14 Nov 2024 10:30 |
| URI: | https://ueaeprints.uea.ac.uk/id/eprint/97581 |
| DOI: | 10.1016/j.scitotenv.2022.160888 |
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