太湖竺山湾甲烷扩散通量及其驱动机制

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Abstract To identify the influence of input of pollutants and eutrophication on the temporal and spatial variations of the CH₄ diffusion flux, monthly field measurements of CH₄ flux was conducted in Zhushan Bay from November 2011 to August 2013. For comparison, the CH₄ flux in the Central Zone of the lake with less impact from human activities was also determined. Results showed that the CH₄ diffusion flux in Zhushan Bay with a mean value of (0.193±0.049) mmol/(m²·d) was significantly (P<0.01) higher than that ((0.024±0.005) mmol/(m²·d)) in the Central Zone. Meanwhile, the highest CH₄ flux occurred at the sampling site with river discharge in Zhushan Bay. Further, the CH₄ diffusion flux in the Central Zone showed apparent temporal variation, and the flux was positively correlated with water temperature (R²=0.53, P<0.01). However, the CH₄ flux showed a poor correlation with water temperature in Zhushan Bay (P>0.05).In addition, both the dissolved CH₄ concentration and CH₄ flux in Zhushan Bay were positively correlated with the dissolved CH₄ concentration in the inflowing river (concentration: R²=0.75, P<0.05; flux: R²=0.64, P<0.05). The results indicated that the external input of pollutants might weaken the effect of temperature on CH₄ flux in Zhushan Bay, leading to the eutrophic Zhushan Bay being a significant source of atmospheric CH₄.

Key words： eutrophic lake methane diffusion flux temporal variation spatial variation external input

Received: 26 May 2021

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	LIU Zhen-jing
	XIAO Qi-tao
	HU Zheng-hua
	ZHANG Mi
	WANG Wei
	XIAO Wei

Cite this article:

LIU Zhen-jing,XIAO Qi-tao,HU Zheng-hua等. Methane diffusion flux and its driving factors in Zhushan Bay of Lake Taihu[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(1): 393-401.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I1/393

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