太湖藻型湖区CH<sub>4</sub>冒泡通量

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Abstract

Ebullition is one of the main pathways for CH₄ emission. To quantify CH₄ ebullition flux and its ratio to total CH₄ emission flux over algae zone of Lake Taihu, floating chamber method was utilized in this study in the Meiliang Bay of Lake Taihu during spring and summer time. The results showed that daytime CH₄ ebullition flux was obviously higher than that of nighttime in both spring and summer seasons. The mean CH₄ ebullition flux and its ratio to total CH₄ flux in spring were 1.843nmol/(m²·s) and 31.2% respectively and that in summer were 104.497nmol/(m²·s) and 68.6%. The results indicated that the dominant CH₄ emission pathway was diffusion in spring and different from spring, ebullition played important role in summer. Temperature (air temperature, surface water temperature, and sediment temperature) and air pressure were significantly correlated to CH₄ ebullition emission at hourly and daily scale. The CH₄ ebullition emission increased exponentially with increasing temperature and increased linearly as air pressure decreased. This study can provide important basic data for accurately estimating total CH₄ emission in Lake Taihu basin and clarifying the contribution of CH₄ emission from lakes in China to the global carbon cycle.

Key words： algae zone of Lake Taihu floating chamber methane flux ebullition flux ratio of ebullition flux meteorological factors

Received: 26 March 2018

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	Articles by authors
	PU Yi-ni
	JIA Lei
	YANG Shi-jun
	QIN Zhi-hao
	SU Rong-ming-zhu
	ZHAO Jia-yu
	ZHANG Mi

Cite this article:

PU Yi-ni,JIA Lei,YANG Shi-jun等. The methane ebullition flux over algae zone of Lake Taihu[J]. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(10): 3914-3924.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2018/V38/I10/3914

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