湿地土壤气体排放对水位变化响应的持续性动态特征

doi:10.12118/j.issn.1000-6060.2021.318

Abstract

Abstract:

Wetlands have an ecological purpose that is correlated with global climate change. On the background of climate change, the spatial and temporal variations of global precipitation amplify the effect on the water environment of river wetlands via catchment confluence, affecting the ecological function of wetlands significantly. To examine the relationship between wetland water level changes and soil gas emission, half water injection and full water injection treatments were considered in reed wetlands in the middle reaches of the Yellow River in China, and the differences in soil gas emission during the 7-day monitored were compared. Compared with natural sites, water injection created a significant difference in soil CO₂ emission rate. Except for the H₂O emission rate of full water injection, H₂O, CO₂, and H₂S emission rates all considered upward trend with soil temperature rising. In the monitoring process, for the effect of half and full water injection, H₂O emissions rate half and full water injection were basically the same, while the difference was higher in the later stage, the effect of did not disappear until 125.64 h, totally water injection resulted in an increase of 76.3% and 31.3% respectively; CO₂ emissions rate appeared asynchronous-converging characteristics, the changes of environment in the initial stage resulted in the consistent reduction of CO₂ emission, and considered a significant difference between 37.69 h and 68.66 h, although the water level recovered from 68.66 h to 125.64 h, the differences still existed, water injection resulted in a reduction of CO₂ total emissions by 50.1% and 43.2% respectively. H₂S emissions rate experienced changeless-asynchronous-changeless process, and totally, resulted in 42.3% and 32.3% increase. The study tracked the dynamic process of soil H₂O, CO₂, and H₂S emission rates after water level rise and found that the effect of a rise of water level on the soil gas emission rate was asynchronous and persistent, demonstrating a long response cycle to CO₂ emissions rate. The results consider high significance to the ecological function of river wetlands, the delayed response of wetland soil gas emission to water level change means that it has a significant effect on wetland ecological function, its fluctuation process needs a longer period of accurate study.

Key words: soil CO₂ emission, changes of wetland water level, ecological function, the water injection test

LU Haibo. Continuous dynamic characteristics of wetland soil gas emission response to water level changes[J].Arid Land Geography, 2022, 45(3): 860-866.

Figures/Tables 6

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气体类型		自然	半注水	满注水
H₂O	自然	1.00	0.06	0.17
	半注水	0.06	1.00	0.35
	满注水	0.17	0.35	1.00
H₂S	自然	1.00	0.23	0.17
	半注水	0.23	1.00	0.97
	满注水	0.17	0.97	1.00
CO₂	自然	1.00	0.00^*	0.00^*
	半注水	0.00^*	1.00	0.31
	满注水	0.00^*	0.31	1.00

Continuous dynamic characteristics of wetland soil gas emission response to water level changes

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