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Potential impacts of climate change on vegetation dynamics and ecosystem function in a mountain watershed on the Qinghai-Tibet Plateau

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Listed:
  • Decheng Zhou

    (Nanjing University of Information Science and Technology)

  • Lu Hao

    (Nanjing University of Information Science and Technology)

  • John B. Kim

    (Pacific Northwest Research Station, USDA Forest Service)

  • Peilong Liu

    (Nanjing University of Information Science and Technology)

  • Cen Pan

    (Nanjing University of Information Science and Technology)

  • Yongqiang Liu

    (Centers for Forest Disturbance Science, Southern Research Station, USDA Forest Service)

  • Ge Sun

    (Eastern Forest Environmental Threat Assessment Center, Southern Research Station, USDA Forest Service)

Abstract

The Qinghai-Tibet Plateau constitutes unique mountain ecosystems that can be used for early detection of the impacts of climate change on ecosystem functions. We use the MAPSS-CENTURY 2 (MC2), a dynamic global vegetation model, to examine the potential responses of terrestrial ecosystems to climate change in the past (1961–2010) and future (2011–2080) under one medium-low warming scenario (RCP4.5) at a 1-km spatial resolution in the Upper Heihe River Basin (UHRB), northwestern China. Results showed that 21.4% of the watershed area has experienced changes in potential natural vegetation types in the past and that 42.6% of the land would undergo changes by the 2070s, characterized by a sharp increase in alpine tundra at the cost of cold barren land. Net primary productivity (NPP) and heterotrophic respiration (RH) have increased sharply since the mid-1980s and are projected to remain at reduced rates in the future. Overall, UHRB switched from carbon neutral to a carbon sink in 1961–2010, and the sink strength is projected to decline after 2040. Additionally, future climate change is projected to drive a decrease in water yield due to a slight decrease in precipitation and an increase in evapotranspiration (ET). Furthermore, we find large spatial variations in simulated ecosystem dynamics, including an upward trend of NPP, RH, and ET in the alpine zone, but a downward trend in the mid-elevation forest zone. These results underscore the complexity of potential impacts of climate change on mountain watersheds that represent the headwaters of inland river systems in an arid environment.

Suggested Citation

  • Decheng Zhou & Lu Hao & John B. Kim & Peilong Liu & Cen Pan & Yongqiang Liu & Ge Sun, 2019. "Potential impacts of climate change on vegetation dynamics and ecosystem function in a mountain watershed on the Qinghai-Tibet Plateau," Climatic Change, Springer, vol. 156(1), pages 31-50, September.
    • Handle: RePEc:spr:climat:v:156:y:2019:i:1:d:10.1007_s10584-019-02524-4
    DOI: 10.1007/s10584-019-02524-4
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    References listed on IDEAS

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    1. Ellynne Kutschera & John B. Kim & G. Stephen Pitts & Ray Drapek, 2023. "“What’s Past Is Prologue”: Vegetation Model Calibration with and without Future Climate," Land, MDPI, vol. 12(6), pages 1-17, May.

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