东洞庭湖涨水期水域碳汇特征及其影响因素

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Abstract In order to exam the characteristics of carbon sinking flux in the East Dongting Lake, several key environmental factors during the rising period in April 2022 in this lake were monitored. The primary productivity of phytoplankton and the exchange fluxes of CO₂ and CH₄ at the water air interface in the rising period of Dongting Lake were studied by vertical induction model and thin boundary layer method. The waters net carbon sinking flux were calculated based on the carbon budget relationship and the influencing factors were analyzed. The results show a significant spatial heterogeneity in the carbon sinking ability of the waters during the rising period, generally show the characteristics of carbon source. The net carbon sinking flux at the outlet of Lake, Chenglingji, Yueyanglou, Bianshan, Lujiao, the island in the lake, butterfly mouth, the big and small West Lakes, the upstream of liumenzha and hongxingzhou is negative, i.e., a carbon source. The fluctuation range of flux various between -4.92 and -0.17 (mmol/(m²·h)). The average carbon sink flux reaches -1.95mmol/(m²·h). The net carbon sinking flux in the lake and the downstream of liumen gate is positive, i.e., a carbon sink. The fluctuation range of flux various between 1.10 and 2.24(mmol/(m²·h)). The average carbon sink flux reaches 1.67mmol/(m²·h). The net carbon sink flux (NPP) in East Dongting Lake waters is mainly affected by CO₂ flux (F_CO₂), CO₂ partial pressure (P_CO₂) and dissolved oxygen (DO). In addition, water level fluctuations, water nutrients, temperature, water alkalinity will also have a greater impact on the carbon sink capacity by changing the P_CO₂ content of the water.

Key words： East Dongting Lake rising period carbon sink environmental factor influence factor

Received: 01 July 2022

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X171.1

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	ZHU Yi-fan
	TIAN Ze-bin
	WANG Li-jing
	JI Dao-bin
	YANG Zhong-yong
	MENG Jiang-huai
	TIAN Pan
	LIU Jia

Cite this article:

ZHU Yi-fan,TIAN Ze-bin,WANG Li-jing等. Characteristics and influencing factors of the rising period of carbon sink flux in East Dongting Lake waters[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(2): 843-853.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I2/843

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