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Quantifying soil nitrous oxide emissions in spring freezing-thawing period over different vegetation types in Northeast China

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Abstract

Environmental changes significantly alter the structure, diversity and activity of soil microbial communities during spring freezing-thawing period, leading to changes in the soil microbial nitrogen cycle. Changes in N2O fluxes after land use conversion from primary forest to secondary forest, Korean pine plantation and cropland in northeast China have not been quantified. Field experiments were conducted to measure soil N2O fluxes in a primary forest, two secondary forests, a Korean pine plantation, and one maize field in a temperate region in northeast China from 2017-03-06 to 2017-05-28. During the experimental period, the soil was exclusively a nitrogen source for all land uses. We found that N2O emissions ranged from 15.63 to 68.74 µg m2 h1, and cumulative N2O emissions ranged from 0.33 to 2.10 kg ha1 during the period. Cumulative N2O emissions from the maize field were significantly higher than that from primary forest, Korean pine plantation, hardwood forest, and Betula platyphylla forest by 262.1% to 536.4%. Compared with other ecosystems in similar studies, the N2O emission rates of all ecosystem types in this study were low during the spring thaw period. Stepwise multiple linear regression indicated that there were significant correlations between N2O emissions and environmental factors (air temperature and soil temperature, soil water content, soil pH, NH4+-N, NO3-N, and soil organic carbon). The results showed that conversion of land use from primary forest to hardwood forest, Korean pine plantation or maize field greatly increased soil N2O emissions during spring freezing-thawing period, and N2O emissions from primary forest were almost the same as those from Betula platyphylla forest.

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Acknowledgments

The authors wish to acknowledge financial assistance and support from the Hubei Key Laboratory of Construction and Management in Hydropower Engineering, China Three Gorges University (No. 2020KSD09), the National Key Research and Development Program of China (2017YFC0504102), the National Natural Science Foundation of China (51979147), and the Ministry of Finance, the Ministry of Industry and Information Technology, and the Ministry of Science and Technology for support of the High Tech Zone in Yichang in creating a special project for highly talented research (No.B19-004).

We would like to thank the Maoershan Ecosystem Research Station for enabling the field experiment. We also would like to thank the reviewers and editors for their time and effort.

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Correspondence to Chang-cheng Mu or Wen-nian Xu.

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Wu, B., Mu, Cc., Liu, H. et al. Quantifying soil nitrous oxide emissions in spring freezing-thawing period over different vegetation types in Northeast China. J. Mt. Sci. 19, 1919–1930 (2022). https://doi.org/10.1007/s11629-021-6894-0

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  • DOI: https://doi.org/10.1007/s11629-021-6894-0

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