新疆典型淡水湖和咸水湖芦苇湿地土壤
CO2、CH4和N2O 排放研究

doi:10.13866/j.azr.2020.05.11

Abstract

Abstract: We compare and analyze the monitoring data of Bosten Lake, China’s largest inland freshwater lake, and Ebinur, Xinjiang’s largest saltwater lake, from December 2016 to November 2017, using static chamber gas chromatography, researching the difference of soil greenhouse gas emissions between typical freshwater lake and saltwater lake reed wetlands in Xinjiang. It showed that (1) by analyzing the average daily emissions during the observation period, it is found that the CO₂ emission trend of the freshwater lake shows a single peak curve, and the CH₄ emission trends at the adjacent time points are not prominent. The N₂O of freshwater lake and saltwater lake are between 9 o’clock and 13 o’clock, and the differences in emissions between 17:00 and 21:00 were not obvious. (2) The seasonal changes of soil CO₂, CH₄, and N₂O in the freshwater lake and saltwater lake reed wetlands showed a single peak curve trend. The peak of greenhouse gas emissions was mainly concentrated in summer. The peak of saltwater lake N₂O emissions appeared in autumn. There were no significant differences in CO₂ and N₂O emissions between the freshwater lake and the saltwater lake (P>0.05), The difference of CH₄ emissions between the two lakes is significant (P<0.05). (3) Lake wetlands store large amounts of greenhouse gases in winter. The release of CO2, CH4, and N2O from Bosten Lake in the spring melt accounts for 22%, 30%, and 12% of the total cumulative emissions for the year, and Lake Ebinur accounted for 40%, 0.8%, and 47%. (4) The effects of soil temperature, soil moisture content, and soil organic matter on the CO₂ emissions of the saltwater lake were weak. pH inhibited N₂O emissions from Bosten Lake, and soil salinity had a strong inhibitory effect on CO₂ and CH₄ emissions from Ebinur. (5) The global warming potential of lake reed wetland soil in arid areas was as follows: freshwater lake > saltwater lake. Both the freshwater lake and the saltwater lake reed wetlands contribute to global warming on the centennial scale.

Key words: Bosten Lake, Ebinur Lake, greenhouse gases, freeze-thaw, global warming potential

WANG Shun-ke, LI Yan-hong, LI Fa-dong, WANG Jin-long. Study on CO₂, CH₄, and N₂O emissions from reed wetlands in typical freshwater lake and saltwater lake in Xinjiang[J].Arid Zone Research, 2020, 37(5): 1183-1193.

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Study on CO₂, CH₄, and N₂O emissions from reed wetlands in typical freshwater lake and saltwater lake in Xinjiang

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Study on CO2, CH4, and N2O emissions from reed wetlands in typical freshwater lake and saltwater lake in Xinjiang

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Study on CO₂, CH₄, and N₂O emissions from reed wetlands in typical freshwater lake and saltwater lake in Xinjiang