辽河口生态修复区CH<sub>4</sub>排放通量季节变化研究

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Abstract Using the Eddy Covariance (EC) technique, the seasonal characteristics of CH₄ flux between a restored salt marsh and atmosphere were analyzed and its main influencing factors during the period between 2016~2021 in the Liao River estuary were determined. The results showed that the average diurnal fluctuation trend and range of CH₄ flux values were different in four seasons in the restored salt marsh. The CH₄ flux fluctuates around zero during the daytime in summer, autumn and winter. The peak CH₄ emission occurred at 05:30, 01:30, 02:30 and 09:00 respectively in four seasons. On the whole, the salt marsh was usually shown as a CH₄ source before 12:00 and a weak CH₄ sink or an insignificant CH₄ source/sink after 12:00. Both the amplitudes and average values of the diurnal variation of CH₄ fluxes were winter, spring, summer and autumn in descending order in the restored salt marsh. The main influencing factors of CH₄ release in the restored area were T_a, PAR and WS. In spring, T_a and CH₄ flux were negatively correlated, while WS and CH₄ flux were positively correlated, T_a and WS accounting for 43.8% of the CH₄ flux variation. In summer, PAR and CH₄ flux were negatively correlated, while PAR was significantly positively correlated with CH₄ flux. In the restored salt marsh of the Liao River estuary, during the year of 2016~2021, the CH₄flux values ranged from -60.9 to 155nmol/(m²·s) in different seasons, the average CH₄ flux value was 14.05nmol/(m²·s). In general, the restored salt marsh acted as a CH₄ source (5.32gC/(m²·a)), with a global warming potential (GWP) of 198.46g CO₂-eq/m².

Key words： eddy covariance CH₄ flux pond aquaculture transitioning ponds back to wetlands coastal blue carbon

Received: 11 April 2023

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	XING Qing-hui
	CHENG Hao
	LIU Si-qi
	XU Xue-mei
	CHEN Hong
	HAN Jian-bo
	DU Jin-qiu

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XING Qing-hui,CHENG Hao,LIU Si-qi等. Seasonal characteristics of CH₄ flux in a restored salt marsh wetland at Liao River estuary[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(11): 6123-6131.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I11/6123

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