易分解碳输入模式对沉积物共代谢效应的影响

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Abstract The microcosm system was constructed to analyze the CO₂ release during the metabolism processes of organic components in the mixed treatment by using the stable carbon isotope tracer. The influence of the labile carbon addition on the decomposition process of organic carbon in lake sediments was also explored. The results showed that: Compared with the control, the CO₂ emissions in the treatment with labile carbon addition increased by 45.49% for single addition treatment (ST), 52.61% for repeated addition treatment (RT) and 57.65% for continuous addition treatment (CT), respectively. The CO₂ emissions from sediments in each treatment increased by 16.92% (ST), 24.26% (RT) and 27.40% (CT) than the control, respectively. Although the positive co-metabolic effect (promoting the decomposition of organic carbon in sediments) was observed in each treatment under different addition modes, the net organic carbon content increased at the end of culture. Glucose promoted the mineralization of organic carbon in sediments, but had little effect on its own metabolism. Considering that the outbreak frequency and range of algae in eutrophic lakes are further increased, the co-metabolism effect triggered by the continuous input of algae organic detritus cannot be ignored, which weakens the function of carbon sink of lake sediments.

Key words： eutrophic lakes co-metabolism effect input mode sediment carbon pool stable carbon isotope technology

Received: 01 June 2020

PACS:	X171
	X524

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	Articles by authors
	MA Jie
	WU Xiao-dong
	SHI Rui-jie
	YAN Xing-cheng
	JI Ming
	XU Xiao-guang
	WANG Guo-xiang
	DANG Xin-yi
	JIANG Yan-ni
	YE Zi

Cite this article:

MA Jie,WU Xiao-dong,SHI Rui-jie等. The co-metabolism effect of lake sediments input pattern of labile carbon[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(1): 396-400.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I1/396

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