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The characteristics and influencing factors of dissolved methane concentrations in Chongqing's central urban area in the Three Gorges Reservoir, China
Qin, Yu1; Ouyang, Changyue1; Gou, Yujia1; Jiang, Chengyong1; Li, Zhe2
2022-05-24
摘要Methane (CH4) emissions from reservoirs have received widespread attention. The central urban area of Chongqing in the Three Gorges Reservoir area was selected as the study area in 2020. The temporal and spatial distribution of dissolved CH4 concentration and flux, key generation pathways, and influencing factors have been studied. The dissolved CH4 concentration in low-water-level period and impoundment period varied from 0.037 similar to 0.12 mu mol.L-1 and 0.11 similar to 0.23 mu mol.L-1, with the average values of (0.066 +/- 0.0067) mu mol.L-1 and (0.13 +/- 0.034) mu mol.L-1. The CH4 flux was (0.941 +/- 0.217) mu mol.m(-2).h(-1) in low-water-level period and (1.915 +/- 0.204) mu mol.m(-2).h(-1) in impoundment period. CH4 was produced by CO2 reduction and acetic acid fermentation, accounting for 17.95% and 82.05% of the total CH4 production, respectively. The dissolved CH4 concentration was significantly positively correlated with DO and NO3--N, and it is opposite with dissolved inorganic carbon. The dissolved CH4 concentration in this study area is affected by water environment (33.42%), inorganic nitrogen (29.60%), organic carbon (23.88%), and inorganic carbon (13.10%), and anthropogenic influences promoted dissolved CH4 concentration.
关键词Three Gorges Reservoir Dissolved CH4 concentration CH4 flux Generation pathways of CH4 Influence factors of CH4
DOI10.1007/s11356-022-20822-w
发表期刊ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
ISSN0944-1344
页码13
通讯作者Qin, Yu(qinyu54001@163.com)
收录类别SCI
WOS记录号WOS:000801072300001
语种英语