巢湖二氧化碳排放特征及其潜在影响因素

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Abstract Water samples from Lake Chaohu were collected in January (dry), April (wet-to-dry transition), and July (wet) to explore the variability of CO₂ emissions from the shallow lake and the corresponding linkage with the sources and optical composition of CDOM. We coupled diffusion coefficient and mass balance approaches to trace the variability of dissolved CO₂ concentration (c_CO₂) and CO₂ efflux (F_CO₂) from Lake Chaohu, and further explore the potential drivers, especially the potential linkage between CO₂ emissions and the optical composition of CDOM. Our results showed that the mean c_CO₂ of the whole lake area in Chaohu was higher in the wet season ((51.9±71.8)μmol/L) than in the wet-to-dry transition season ((48.9±29.0)μmol/L), and further higher than in the dry season ((35.2±15.6)μmol/L). We observed a slight sink of CO₂ in the lake in the dry season ((-98.8±20.1)mg/(m²·d)), and there was no significant difference between the mean F_CO₂ in the wet season ((219.3±275.5)mg/(m²·d)) and the wet-to-dry transition season ((219.9±157.8)mg/(m²·d)). We found higher mean c_CO₂ and F_CO₂ in the western than in the central and further higher than in the eastern area of Lake Chaohu. In the western area of Lake Chaohu, dissolved oxygen (DO) was negatively correlated with c_CO₂(P<0.05) and F_CO₂(P<0.001); and we further found that both c_CO₂ and F_CO₂ increased with increasing dissolved organic carbon (DOC) (P<0.01) and chlorophyll-a(Chl-a) (P<0.001). Parallel factor analysis coupled with excitation-emission matrices revealed four fluorescent components, and both c_CO₂ and F_CO₂ increased with increasing humic-rich components C1 (P<0.01) and C4 (P<0.001). No significant correlation was found between c_CO₂, F_CO₂ and tryptophan-like C2, or beteween c_CO₂, F_CO₂ and tyrosine-like C3. Our results suggested that elevated trophic level potentially drive the emission of CO₂ from Lake Chaohu, and the source and composition of CDOM, especially the input of terrestrial humic-rich substances, potentially favors the emission of CO₂ from the lake.

Key words： Lake Chaohu carbon dioxide (CO₂) flux chromophoric dissolved organic matter (CDOM) parallel factor analysis (PARAFAC)

Received: 27 May 2021

PACS:	X143
	X171

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	Articles by authors
	LI Yu-yang
	ZHU Jun-yu
	YU Xiao-qin
	CHEN Hui-min
	GUO Yan-ni
	ZHOU Yong-qiang
	ZHOU Lei

Cite this article:

LI Yu-yang,ZHU Jun-yu,YU Xiao-qin等. Emission of carbon dioxide from Lake Chaohu and the potential influencing factors[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(1): 425-433.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I1/425

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