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Warming Increases Nitrous Oxide Emission from the Littoral Zone of Lake Poyang, China

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  • Junxiang Cheng

    (Key Laboratory of Watershed Geographic Sciences, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China
    College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China)

  • Ligang Xu

    (Key Laboratory of Watershed Geographic Sciences, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China
    College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China
    Eco-Environmental Engineering Research Center, China Three Gorges Corporation, Beijing 100038, China)

  • Mingliang Jiang

    (Key Laboratory of Watershed Geographic Sciences, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China
    College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China)

  • Jiahu Jiang

    (Key Laboratory of Watershed Geographic Sciences, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China
    College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China)

  • Yanxue Xu

    (Chinese Academy of Environmental Planning, Beijing 100012, China)

Abstract

Littoral wetlands are globally important for sustainable development; however, they have recently been identified as critical hotspots of nitrous oxide (N 2 O) emissions. N 2 O flux from subtropical littoral wetlands remains unclear, especially under the current global warming environment. In the littoral zone of Lake Poyang, a simulated warming experiment was conducted to investigate N 2 O flux. Open-top chambers were used to raise temperature, and the static chamber-gas chromatograph method was used to measure N 2 O flux. Results showed that the littoral zone of Lake Poyang was an N 2 O source, with an average flux rate of 8.9 μg N 2 O m −2 h −1 . Warming significantly increased N 2 O emission (13.8 μg N 2 O m −2 h −1 under warming treatment) by 54% compared to the control treatment. N 2 O flux in the spring growing season was also significantly higher than that of the autumn growing season. In addition, temperature was not significantly related to N 2 O flux, while soil moisture only explained about 7% of N 2 O variation. These results imply that N 2 O emission experiences positive feedback effect on the ongoing warming of the climate, and abiotic factors (e.g., soil temperature and soil moisture) were not main controls on N 2 O variation in this littoral wetland.

Suggested Citation

  • Junxiang Cheng & Ligang Xu & Mingliang Jiang & Jiahu Jiang & Yanxue Xu, 2020. "Warming Increases Nitrous Oxide Emission from the Littoral Zone of Lake Poyang, China," Sustainability, MDPI, vol. 12(14), pages 1-12, July.
    • Handle: RePEc:gam:jsusta:v:12:y:2020:i:14:p:5674-:d:384698
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    References listed on IDEAS

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