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Reduced Carbon Dioxide Sink and Methane Source under Extreme Drought Condition in an Alpine Peatland

Author

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  • Xiaoming Kang

    (Institute of Wetland Research, Chinese Academy of Forestry, Beijing 100091, China
    Beijing Key Laboratory of Wetland Services and Restoration, Beijing 100091, China
    Sichuan Zoige Wetland Ecosystem Research Station, Tibetan Autonomous Prefecture of Aba 624500, China)

  • Liang Yan

    (Institute of Wetland Research, Chinese Academy of Forestry, Beijing 100091, China
    Beijing Key Laboratory of Wetland Services and Restoration, Beijing 100091, China
    Sichuan Zoige Wetland Ecosystem Research Station, Tibetan Autonomous Prefecture of Aba 624500, China)

  • Lijuan Cui

    (Institute of Wetland Research, Chinese Academy of Forestry, Beijing 100091, China
    Beijing Key Laboratory of Wetland Services and Restoration, Beijing 100091, China
    Sichuan Zoige Wetland Ecosystem Research Station, Tibetan Autonomous Prefecture of Aba 624500, China)

  • Xiaodong Zhang

    (Institute of Wetland Research, Chinese Academy of Forestry, Beijing 100091, China
    Beijing Key Laboratory of Wetland Services and Restoration, Beijing 100091, China
    Sichuan Zoige Wetland Ecosystem Research Station, Tibetan Autonomous Prefecture of Aba 624500, China)

  • Yanbin Hao

    (University of Chinese Academy of Sciences, Beijing 100049, China)

  • Haidong Wu

    (Institute of Wetland Research, Chinese Academy of Forestry, Beijing 100091, China
    Beijing Key Laboratory of Wetland Services and Restoration, Beijing 100091, China
    Sichuan Zoige Wetland Ecosystem Research Station, Tibetan Autonomous Prefecture of Aba 624500, China)

  • Yuan Zhang

    (University of Chinese Academy of Sciences, Beijing 100049, China)

  • Wei Li

    (Institute of Wetland Research, Chinese Academy of Forestry, Beijing 100091, China
    Beijing Key Laboratory of Wetland Services and Restoration, Beijing 100091, China
    Sichuan Zoige Wetland Ecosystem Research Station, Tibetan Autonomous Prefecture of Aba 624500, China)

  • Kerou Zhang

    (Institute of Wetland Research, Chinese Academy of Forestry, Beijing 100091, China
    Beijing Key Laboratory of Wetland Services and Restoration, Beijing 100091, China
    Sichuan Zoige Wetland Ecosystem Research Station, Tibetan Autonomous Prefecture of Aba 624500, China)

  • Zhongqing Yan

    (Institute of Wetland Research, Chinese Academy of Forestry, Beijing 100091, China
    Beijing Key Laboratory of Wetland Services and Restoration, Beijing 100091, China
    Sichuan Zoige Wetland Ecosystem Research Station, Tibetan Autonomous Prefecture of Aba 624500, China)

  • Yong Li

    (Institute of Wetland Research, Chinese Academy of Forestry, Beijing 100091, China
    Beijing Key Laboratory of Wetland Services and Restoration, Beijing 100091, China
    Sichuan Zoige Wetland Ecosystem Research Station, Tibetan Autonomous Prefecture of Aba 624500, China)

  • Jinzhi Wang

    (Institute of Wetland Research, Chinese Academy of Forestry, Beijing 100091, China
    Beijing Key Laboratory of Wetland Services and Restoration, Beijing 100091, China
    Sichuan Zoige Wetland Ecosystem Research Station, Tibetan Autonomous Prefecture of Aba 624500, China)

Abstract

Potential changes in both the intensity and frequency of extreme drought events are vital aspects of regional climate change that can alter the distribution and dynamics of water availability and subsequently affect carbon cycles at the ecosystem level. The effects of extreme drought events on the carbon budget of peatland in the Zoige plateau and its response mechanisms were studied using an in-field controlled experimental method. The results indicated that the peatland ecosystem of the Zoige plateau functioned as a carbon sink while under the control (CK) or extreme drought (D) treatment throughout the entire growing season. Maximum fluxes of methane (CH 4 ) emissions and the weakest carbon sink activity from this ecosystem were in the early growth stage, the most powerful carbon sink activity was during the peak growth stage, while the absorption sink activity of carbon dioxide (CO 2 ) and CH 4 was present during the senescence stage. Extreme drought reduced the gross primary productivity (GPP) and ecosystem respiration (R e ) of the peatland ecosystem by 14.5% and 12.6%, respectively ( p < 0.05) and the net ability to store carbon was reduced by 11.3%. Overall, the GPP was highly sensitive to extreme drought. Moreover, extreme drought significantly reduced the CH 4 fluxes of the ecosystem and even changed the peatland from a CH 4 emission source to a CH 4 sink. Subsequent to drought treatment, extreme drought was also shown to have a carry-over effect on the carbon budget of this ecosystem. Soil water content and soil temperature were the main driving factors of carbon budget change in the peatland of the Zoige plateau, but with the increase in soil depth, these driving forces were decreased. The findings indicated that frequent extreme drought events in the future might reduce the net carbon sink function of peatland areas, with an especially strong influence on CO 2 .

Suggested Citation

  • Xiaoming Kang & Liang Yan & Lijuan Cui & Xiaodong Zhang & Yanbin Hao & Haidong Wu & Yuan Zhang & Wei Li & Kerou Zhang & Zhongqing Yan & Yong Li & Jinzhi Wang, 2018. "Reduced Carbon Dioxide Sink and Methane Source under Extreme Drought Condition in an Alpine Peatland," Sustainability, MDPI, vol. 10(11), pages 1-15, November.
    • Handle: RePEc:gam:jsusta:v:10:y:2018:i:11:p:4285-:d:183927
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    Cited by:

    1. Rong Leng & Quanzhi Yuan & Yushuang Wang & Qian Kuang & Ping Ren, 2020. "Carbon Balance of Grasslands on the Qinghai-Tibet Plateau under Future Climate Change: A Review," Sustainability, MDPI, vol. 12(2), pages 1-21, January.

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