Seasonal characteristics of CH4 flux in a restored salt marsh wetland at Liao River estuary
XING Qing-hui1, CHENG Hao1, LIU Si-qi1,2, XU Xue-mei1, CHEN Hong1, HAN Jian-bo1, DU Jin-qiu1
1. State Environmental Protection Key Laboratory of Marine Ecosystem Restoration, National Marine Environmental Monitoring Center, Dalian 116023, China; 2. College of Marine Ecology and Environment, Shanghai Ocean University, Shanghai 201306, China
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 Ta, PAR and WS. In spring, Ta and CH4 flux were negatively correlated, while WS and CH4 flux were positively correlated, Ta 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.
邢庆会, 程浩, 刘思琪, 徐雪梅, 陈虹, 韩建波, 杜金秋. 辽河口生态修复区CH4排放通量季节变化研究[J]. 中国环境科学, 2023, 43(11): 6123-6131.
XING Qing-hui, CHENG Hao, LIU Si-qi, XU Xue-mei, CHEN Hong, HAN Jian-bo, DU Jin-qiu. Seasonal characteristics of CH4 flux in a restored salt marsh wetland at Liao River estuary. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(11): 6123-6131.
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