中国主要河口淡水和咸水芦苇湿地CH<sub>4</sub>和CO<sub>2</sub>产生速率及影响因子

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Abstract This study collected the surface soil samples (0~10cm) from the freshwater (salinity: 0) and mesohaline (salinity: 10~15) P. australis marshes in the six main estuaries in China, which are the Liao River Estuary, Yellow River Estuary, Yangtze River Estuary, Oujiang River Estuary, Minjiang River Estuary, and Pearl River Estuary. The production rates of soil CH₄ and CO₂ were measured using laboratory anaerobic slurry incubation method, and the extracellular enzyme activity and abundance of methanogen functional genes (mcrA) were also measured. Mean CH₄ production rate in the freshwater and saltwater P. australis marshes was (2.69±1.63) and (2.97±1.71) ng CH₄/(g·d), respectively. Mean CO₂ production rate was (7.64±4.94)and (10.28±6.84) μg CO₂/(g·d), respectively. CO₂ production rate in the freshwater P. australis marshes was significantly lower than that in mesohaline P. australis marshes, but no significant difference in CH₄ production rate was observed between freshwater and mesohaline marshes. Soil pH and soil organic carbon (SOC) content were identified as the main factors influencing extracellular enzyme activity and methanogen abundance. A decrease in pH led to a significant reduction in the production rates of CH₄ and CO₂. Total carbon, total nitrogen, SOC, activity of five extracellular enzymes, and abundance of mcrA were identified as the key factors influencing CH₄ and CO₂ production. Our research results suggest that across the Chinese coastal estuarine freshwater and mesohaline P. australis marshes, salinity is not a main factor controlling CH₄ production, however, the increase in salinity perhaps raise soil anaerobic mineralization rates, which indicates that sea level rise and saltwater intrusion will cause carbon emission increase from estuarine P. australis marshes.

Key words： methane production rate carbon dioxide production rate extracellular enzymes salinity reed marsh estuary China

Received: 15 October 2024

PACS:

X511

Corresponding Authors: 仝川,责任作者,教授,tongch@fjnu.edu.cn E-mail: tongch@fjnu.edu.cn

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	FENG Zhi-hua
	HU Fang
	ZHAN Peng-fei
	HUANG Jia-fang
	TONG Chuan

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FENG Zhi-hua,HU Fang,ZHAN Peng-fei等. Production rates and key influencing factors of CH₄ and CO₂ of freshwater and saltwater Phragmites australismarshes in major estuaries of China[J]. CHINA ENVIRONMENTAL SCIENCECE, 2025, 45(4): 2240-2250.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2025/V45/I4/2240

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