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

Junxiang Cheng, Ligang Xu, Mingliang Jiang, Jiahu Jiang and Yanxue Xu
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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
Ligang Xu: Key Laboratory of Watershed Geographic Sciences, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China
Mingliang Jiang: Key Laboratory of Watershed Geographic Sciences, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China
Jiahu Jiang: Key Laboratory of Watershed Geographic Sciences, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China
Yanxue Xu: Chinese Academy of Environmental Planning, Beijing 100012, China

Sustainability, 2020, vol. 12, issue 14, 1-12

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.

Keywords: nitrous oxide; climate warming; littoral wetland (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2020
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