高原湖泊溶解甲烷浓度空间异质性研究—以阳宗海秋季为例

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Abstract Near-surface and vertical profiles of dissolved CH₄ concentrations were measured at a high resolution using the new fast-response automated gas equilibrator (FaRAGE) connected to a greenhouse gas analyzer at Yangzonghai Lake in November 2020, to investigate the spatial pattern of dissolved CH₄ and its driving factors. Results showed that dissolved CH₄ concentrations of surface water ranged between 0.02 and 0.97μmol/L, indicating a net source of atmosphere CH₄. The dissolved CH₄ was relatively higher in the north and south parts of the lake, but lower in the middle area, which was mainly influenced by aquatic plants distribution, discharge from inflow rivers and topographical conditions. Vertical profiles of dissolved CH₄ at different spots of the lake exhibited relatively consistent pattern, while CH₄ was more significantly oxidized in the middle section. The bootstrap analysis suggested that estimates of CH₄ emission derived from fewer measurements were subjected to potentially large biases, and the minimum number of sampling sites that guaranteed an accurate estimation of diffusive CH₄ flux at Yangzonghai Lake was 3.7per km². It was necessary to perform high-resolution observations of CH₄ concentration for an accurate estimation of carbon emission from lakes or reservoirs.

Key words： greenhouse gas dissolved concentration spatial distribution flux Yangzonghai Lake

Received: 21 June 2021

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X524

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	Articles by authors
	ZHENG Xiang-wang
	CHEN Min
	XIAO Shang-bin
	WANG Sheng-rui
	WANG Xue-zhu
	CHEN Wei
	LIU Jia
	XU Hao-ting

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ZHENG Xiang-wang,CHEN Min,XIAO Shang-bin等. Spatial heterogeneity of dissolved methane in a plateau lake: a case study in Yangzonghai Lake in autumn[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(2): 834-842.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I2/834

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