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Direct vegetation response to recent CO2 rise shows limited effect on global streamflow

Author

Listed:
  • Haoshan Wei

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Yongqiang Zhang

    (Chinese Academy of Sciences)

  • Qi Huang

    (Chinese Academy of Sciences
    University of Chinese Academy of Sciences)

  • Francis H. S. Chiew

    (Black Mountain)

  • Jinkai Luan

    (Chinese Academy of Sciences)

  • Jun Xia

    (Wuhan University)

  • Changming Liu

    (Chinese Academy of Sciences)

Abstract

Global streamflow, crucial for ecology, agriculture, and human activities, can be influenced by elevated atmospheric CO2 (eCO2) though direct regulation of vegetation physiology and structure, which can either decrease or increase streamflow. Despite a 21.8% rise in CO2 over 40 years, its impact on streamflow is not obvious and remains highly debated. Using a full differential approach at the catchment scale and an optimum finger approach globally, both constrained by observed streamflow, here, we find that vegetation responses to eCO2 in 1981–2020 has limited impact on streamflow via direct regulation. The median eCO2 contribution approaches zero across 1116 unimpacted catchments, and global streamflow changes cannot be solely attributed to eCO2. These results offer key insights into the intricate dynamics of CO2 and other factors shaping streamflow changes over the past four decades. Such understanding is vital for attributing current streamflow changes under eCO2 conditions.

Suggested Citation

  • Haoshan Wei & Yongqiang Zhang & Qi Huang & Francis H. S. Chiew & Jinkai Luan & Jun Xia & Changming Liu, 2024. "Direct vegetation response to recent CO2 rise shows limited effect on global streamflow," Nature Communications, Nature, vol. 15(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-53879-x
    DOI: 10.1038/s41467-024-53879-x
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