丹江口水库浪河库湾夏季溶存CH<sub>4</sub>特征

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Abstract This study focuses on the dissolved CH₄ concentration (C_CH4), CH₄ diffusive flux at the water-air interface (F_CH4) and the physicochemical properties of the water body in Danjiangkou Reservoir. Using high-resolution equipment (FaRAGE), a two-day monitoring campaign was conducted from August 20^th to 22^nd, 2023 in the Langhe Bay, including continuous monitoring at a certain site and vertical profile monitoring at multiple sites. The results showed that the surface C_CH4 and F_CH4 in the reservoir bay exhibited significant spatial variability, with mean values of (0.54±0.16) μmol/L and (89.35±27.23) μg/(m²·h), respectively, and F_CH4 was comparable to other water source reservoirs but generally lower than non-water-source reservoirs. Vertically, C_CH4 was stratified with low levels in the surface water and high levels in the bottom water. Temporally, the nocturnal surface C_CH4 and F_CH4 were higher than those during the day. The results of the structural equation model indicated that spatial variations of surface C_CH4 in the reservoir bay could be attributed to pH with an explanation degree of 39.17%. Vertically, water temperature and dissolved oxygen (DO) mainly drove C_CH4, explaining 56.14% and 35.25% of the variance of C_CH4, respectively, while 52.32% of variance of diurnal C_CH4 resulted dominantly from DO. Water quality in the reservoir bay was classified as the oligotrophic status based on the comprehensive trophic level index (TLI(Σ)), and TLI(Σ) of the surface water gradually decreased longitudinally from site LH00 to LH05, with an average of (47.36±8.28). Vertically, TLI(Σ) (the mean was less than 50) was lower in the middle layer than both at the surface and bottom layers of the water column. There was no significant positive correlation between C_CH4 and TLI(Σ) in the Danjiangkou Reservoir, which was different from the findings in other studies. The mesotrophic water in source reservoirs reduced the risk of algal blooms, and thereby maintained the water quality and low CH₄ emissions; however, evaluating CH₄ emissions using TLI(Σ) was not suitable for mesotrophic reservoirs.

Key words： Danjiangkou Reservoir dissolved CH₄ comprehensive trophic level index dissolved oxygen pH value

Received: 18 March 2024

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X524

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	MENG Jiang-huai
	XIAO Shang-bin
	KANG Man-chun
	LIU Jia
	JI Dao-bin
	LONG Liang-hong
	ZHU Yi-fan
	FU Chen-le
	HAN Yan-xing

Cite this article:

MENG Jiang-huai,XIAO Shang-bin,KANG Man-chun等. The characteristics of dissolved CH₄ in the Langhe Bay of the Danjiangkou Reservoir in summer[J]. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(11): 6302-6312.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2024/V44/I11/6302

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