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<p>Northern forests (forests north of 30°N) are major terrestrial carbon dioxide (CO<sub>2</sub>) sinks, while rapid warming can disturb their CO<sub>2</sub> sink function. Here we use multi-year net CO<sub>2</sub> exchange observations from 65 northern forest sites to show that the increased net CO<sub>2</sub> uptake during warmer springs was more pronounced in old forests (&gt;90 years old) compared to young (&lt;40 years old) and mid-aged (40–90 years old) forests. In addition, the decreased net CO<sub>2</sub> uptake during warmer summers and autumns was more pronounced in young forests compared to mid- and old-aged forests. Annually, this resulted in an increase in net CO<sub>2</sub> uptake due to seasonal warming for old forests (4.8 g C m<sup>−2</sup> yr<sup>-1</sup>) and a decrease in young- and mid-aged forests (3.2 and 0.8 g C m<sup>−2</sup> yr<sup>-1</sup>, respectively). In future projections, increasingly uneven seasonal warming may amplify the impacts of stand age on CO<sub>2</sub> sinks of northern forests.</p>

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Seasonal warming responses of the carbon dioxide sink from northern forests are sensitive to stand age

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年1月21日

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  • Peng Liu,
  • Tianshan Zha,
  • T. Andrew Black,
  • Rachhpal S. Jassal,
  • Xin Jia,
  • Asko Noormets,
  • Andrew Ouimette,
  • Yun Tian,
  • Xinhao Li

摘要

Northern forests (forests north of 30°N) are major terrestrial carbon dioxide (CO2) sinks, while rapid warming can disturb their CO2 sink function. Here we use multi-year net CO2 exchange observations from 65 northern forest sites to show that the increased net CO2 uptake during warmer springs was more pronounced in old forests (>90 years old) compared to young (<40 years old) and mid-aged (40–90 years old) forests. In addition, the decreased net CO2 uptake during warmer summers and autumns was more pronounced in young forests compared to mid- and old-aged forests. Annually, this resulted in an increase in net CO2 uptake due to seasonal warming for old forests (4.8 g C m−2 yr-1) and a decrease in young- and mid-aged forests (3.2 and 0.8 g C m−2 yr-1, respectively). In future projections, increasingly uneven seasonal warming may amplify the impacts of stand age on CO2 sinks of northern forests.