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Observed Methane Uptake and Emissions at the Ecosystem Scale and Environmental Controls in a Subtropical Forest

Author

Listed:
  • Hui Wang

    (Center for Ecological Forecasting and Global Change, College of Forestry, Northwest A&F University, Yangling 712100, China)

  • Hong Li

    (Faculty of Architecture and Urban Planning, Chongqing University, Chongqing 400045, China)

  • Zhihao Liu

    (Center for Ecological Forecasting and Global Change, College of Forestry, Northwest A&F University, Yangling 712100, China)

  • Jianhua Lv

    (Center for Ecological Forecasting and Global Change, College of Forestry, Northwest A&F University, Yangling 712100, China)

  • Xinzhang Song

    (State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Hangzhou 311300, China)

  • Quan Li

    (State Key Laboratory of Subtropical Silviculture, Zhejiang A&F University, Hangzhou 311300, China)

  • Hong Jiang

    (International Institute for Earth System Science, Nanjing University, Nanjing 210023, China)

  • Changhui Peng

    (Center for Ecological Forecasting and Global Change, College of Forestry, Northwest A&F University, Yangling 712100, China
    Department of Biology Sciences, Institute of Environment Sciences, University of Quebec at Montreal, Montreal, QC H3C 3P8, Canada)

Abstract

Methane (CH 4 ) is one of the three most important greenhouse gases. To date, observations of ecosystem-scale methane (CH 4 ) fluxes in forests are currently lacking in the global CH 4 budget. The environmental factors controlling CH 4 flux dynamics remain poorly understood at the ecosystem scale. In this study, we used a state-of-the-art eddy covariance technique to continuously measure the CH 4 flux from 2016 to 2018 in a subtropical forest of Zhejiang Province in China, quantify the annual CH 4 budget and investigate its control factors. We found that the total annual CH 4 budget was 1.15 ± 0.28~4.79 ± 0.49 g CH 4 m −2 year −1 for 2017–2018. The daily CH 4 flux reached an emission peak of 0.145 g m −2 d −1 during winter and an uptake peak of −0.142 g m −2 d −1 in summer. During the whole study period, the studied forest region acted as a CH 4 source (78.65%) during winter and a sink (21.35%) in summer. Soil temperature had a negative relationship ( p < 0.01; R 2 = 0.344) with CH 4 flux but had a positive relationship with soil moisture ( p < 0.01; R 2 = 0.348). Our results showed that soil temperature and moisture were the most important factors controlling the ecosystem-scale CH 4 flux dynamics of subtropical forests in the Tianmu Mountain Nature Reserve in Zhejiang Province, China. Subtropical forest ecosystems in China acted as a net source of methane emissions from 2016 to 2018, providing positive feedback to global climate warming.

Suggested Citation

  • Hui Wang & Hong Li & Zhihao Liu & Jianhua Lv & Xinzhang Song & Quan Li & Hong Jiang & Changhui Peng, 2021. "Observed Methane Uptake and Emissions at the Ecosystem Scale and Environmental Controls in a Subtropical Forest," Land, MDPI, vol. 10(9), pages 1-16, September.
    • Handle: RePEc:gam:jlands:v:10:y:2021:i:9:p:975-:d:636755
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    References listed on IDEAS

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    2. Frank Keppler & John T. G. Hamilton & Marc Braß & Thomas Röckmann, 2006. "Methane emissions from terrestrial plants under aerobic conditions," Nature, Nature, vol. 439(7073), pages 187-191, January.
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