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Methane dynamics in the Hailuogou Glacier forefield, Southwest China
Dong Li; Qian Bao; Min Zhao; Fan Xia; Xun Wang
2022
Source PublicationEnvironmental Research
Volume214Pages:113767
Abstract

Soils in glacier forefields have a significant capacity for atmospheric CH4 uptake, but this pattern could be changed by high soil water content (SWC). The Hailuogou Glacier in SW China is a typical temperate monsoon glacier on siliceous bedrock, where a forefield soil chronosequence has developed with progressive glacier recession. To understand CH4 dynamics and their potential regulatory factors, we measured the concentrations and stable carbon (C) isotope compositions of CH4 and CO2, soil physicochemical properties, and perfromed a high-throughput sequencing. Among nine sampling sites, soil CH4 concentrations of six sites were below atmospheric levels and δ13C–CH4 values were similar to atmospheric levels. The average value was approximately −48.6‰ and without obvious fractionation. The soil CH4 concentrations exceeded atmospheric levels for the remaining three sites, and the δ13C–CH4 values were more enriched with increasing soil CH4 concentration. We calculated the soil-atmosphere CH4 flux (Jatm) using the concentration gradient method based on the soil CH4 concentration, sampling depth, and soil porosityJatm ranges from −0.08 to −0.52 mg m−2 d−1, acting as an atmospheric CH4 sink. It also shows that the correlation with soil exposure age or vegetation succession was insignificant. But the CH4 emission shows a larger variation changing from 0.05 to 1.8 mg m−2 d−1, which could result from local CH4 production differences catalyzed by aceticlastic methanogens. The results showed that not all sites acted as a net CH4 sink. SWC may have an important influence on CH4 dynamics in the Hailuogou Glacier forefield (HGF).

KeywordHailuogou Glacier Forefield Methane Dynamics Carbon Isotope Methane Flux Soil Water Content
DOI10.1016/j.envres.2022.113767
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Indexed BySCI
Language英语
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Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/13527
Collection环境地球化学国家重点实验室
Affiliation1.State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, CAS, Guiyang 550081, China
2.University of Chinese Academy of Sciences, Beijing 100049, China
3.Laboratory of Land Resources Evaluation and Monitoring in Southwest China of Ministry of Education, Sichuan Normal University, Chengdu 610066, China
Recommended Citation
GB/T 7714
Dong Li,Qian Bao,Min Zhao,et al. Methane dynamics in the Hailuogou Glacier forefield, Southwest China[J]. Environmental Research,2022,214:113767.
APA Dong Li,Qian Bao,Min Zhao,Fan Xia,&Xun Wang.(2022).Methane dynamics in the Hailuogou Glacier forefield, Southwest China.Environmental Research,214,113767.
MLA Dong Li,et al."Methane dynamics in the Hailuogou Glacier forefield, Southwest China".Environmental Research 214(2022):113767.
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