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Greenhouse gas fluxes response to autumn freeze–thaw period in continuous permafrost region of Daxing’an Mountains, Northeast China

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Abstract

Autumn freeze–thaw period significantly influenced the soil temperature, moisture, nutrients, and then affected the structure and diversity of soil microbial community. In this paper, three types of wetlands in the permafrost region of Daxing’an Mountains were selected to investigate the greenhouse gas fluxes during the autumn freeze–thaw period. CO2, CH4, and N2O fluxes during the autumn freeze–thaw period ranged from 24.76 to 124.06 mg m−2 h−1, − 249.10 to 968.87 μg m−2 h−1, and − 4.21 to 12.86 μg m−2 h−1. CO2 fluxes were mainly influenced by soil temperature and moisture. CH4 fluxes were mainly influenced by temperature and soil moisture. And N2O fluxes were significantly affected by temperature, soil moisture, ammonia nitrogen, and nitrate nitrogen. Environmental factors could explain 64–73.2%, 51–85.4%, and 60.3–93.3% of temporal variation of CO2, CH4, and N2O fluxes, respectively. Comparing different wetlands, the soil temperature was the significant factor to affect the CH4 flux. The global warming potentials during the autumn freeze–thaw period ranged from 717.83 to 775.57 kg CO2-eq hm−2.

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Funding

The authors received financial support from the National Natural Science Foundation of China (No. 31971468, 31870471).

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Dawen Gao: conceptualization, data curation, formal analysis, investigation, funding acquisition, and writing-review & editing. Weijie Wang: data curation, formal analysis, and writing-original draft. Weifeng Gao: Validation and writing-review & editing. Qingbo Zeng: investigation, and writing-original draft. Hong Liang: Funding acquisition, resources, supervision, and writing-review & editing.

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Correspondence to Dawen Gao.

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The authors declare no competing interests.

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Gao, D., Wang, W., Gao, W. et al. Greenhouse gas fluxes response to autumn freeze–thaw period in continuous permafrost region of Daxing’an Mountains, Northeast China. Environ Sci Pollut Res 29, 63753–63767 (2022). https://doi.org/10.1007/s11356-022-20371-2

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  • DOI: https://doi.org/10.1007/s11356-022-20371-2

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