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Greenhouse gas fluxes from different types of permafrost regions in the Daxing'an Mountains, Northeast China

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Abstract

Global warming will increase the greenhouse gas (GHG) fluxes of permafrost regions. However, little is known about the difference in GHG fluxes among different types of permafrost regions. In this study, we used the static opaque chamber and gas chromatography techniques to determine the fluxes of carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O) in predominantly continuous permafrost (PCP), predominantly continuous and island permafrost (PCIP), and sparsely island permafrost (SIP) regions during the growing season. The main factors causing differences in GHG fluxes among three types of permafrost regions were also analyzed. The results showed mean CO2 fluxes in SIP were significantly higher than that in PCP and PCIP, which were 342.10 ± 11.46, 105.50 ± 10.65, and 127.15 ± 14.27 mg m−2 h−1, respectively. This difference was determined by soil temperature, soil moisture, total organic carbon (TOC), nitrate nitrogen (NO3-N), and ammonium nitrogen (NH4+-N) content. Mean CH4 fluxes were -26.47 ± 48.83 (PCP), 118.35 ± 46.93 (PCIP), and 95.52 ± 32.86 μg m−2 h−1 (SIP). Soil temperature, soil moisture, and TOC content were the key factors to determine whether permafrost regions were CH4 sources or sinks. Similarly, PCP behaved as the sink of N2O, PCIP and SIP behaved as the source of N2O. Mean N2O fluxes were -3.90 ± 1.71, 0.78 ± 1.55, and 3.78 ± 1.59 μg m−2 h−1, respectively. Soil moisture and TOC content were the main factors influencing the differences in N2O fluxes among the three permafrost regions. This study clarified and explained the differences in GHG fluxes among three types of permafrost regions, providing a data basis for such studies.

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The original contributions presented in the study are included in the article/Supplementary Material, further inquiries can be directed to the corresponding authors.

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Acknowledgements

The authors gratefully acknowledge the financial supports by the National Natural Science Foundation of China (No. 31971468, 31870471).

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Dawen Gao: Conceptualization, data curation, formal anglysis, investigation, funding acquistion, and writing-review & editing. Feng Li: Data curation, formal anglysis, 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. All authors read and approved the final manuscript.

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Correspondence to Dawen Gao.

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Gao, D., Li, F., Gao, W. et al. Greenhouse gas fluxes from different types of permafrost regions in the Daxing'an Mountains, Northeast China. Environ Sci Pollut Res 30, 97578–97590 (2023). https://doi.org/10.1007/s11356-023-29262-6

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  • DOI: https://doi.org/10.1007/s11356-023-29262-6

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