Canadian net forest CO<sub>2</sub> uptake enhanced by heat drought via reduced respiration
Dong, G., Jiang, F., Zhang, Y., Ju, W., Piao, S., et al. (2026). Canadian net forest CO2 uptake enhanced by heat drought via reduced respiration. Nature Geoscience, doi:https://doi.org/10.1038/s41561-025-01875-1
| Title | Canadian net forest CO<sub>2</sub> uptake enhanced by heat drought via reduced respiration |
|---|---|
| Genre | Article |
| Author(s) | G. Dong, F. Jiang, Y. Zhang, W. Ju, S. Piao, P. Ciais, W. Peters, I. T. Luijkx, J. Liu, F. Chevallier, N. Zeng, X. Tian, S. Maksyutov, O. Sonnentag, M. A. Arain, A. G. Barr, Y. Huang, C. Yue, W. Yuan, L. Liu, L. Fan, X. Yue, J. Xiao, X. Li, S. Sitch, P. Friedlingstein, M. O'Sullivan, J. Knauer, V. Arora, Daniel Kennedy, L. Ma, P. E. Thornton, R. Seferian, T. Nutzel, J. Heinke, Q. Sun, S. Zaehle, P. Peylin, E. Kato, H. Alcock, B. Lecavalier, M. Wu, J. Wang, L. Zhang, G. Lv, D. Zhao, J. M. Chen |
| Abstract | The response of net forest carbon uptake to warm extremes remains elusive. The year 2023 was at the time 'the hottest year on record' globally, with Canada's forests experiencing warm anomalies of above 2 °C and unprecedented drought and wildfires, providing a unique case to examine the response of boreal forest net carbon uptake to climate extremes. Here we combine satellite-based atmospheric CO2 flux inversions with ground-based in situ observations of CO2 fluxes and concentrations to investigate Canada's forest net carbon uptake and its underlying mechanisms in 2023. We find that, compared with 2015–2022, Canada's forest net carbon uptake was enhanced by 0.28 ± 0.23 PgC, offsetting 38–48% of Canadian wildfire emissions in 2023. This enhanced net uptake was dominated by large ecosystem respiration reductions, mainly attributable to severe root-zone soil moisture deficits and the unimodal temperature response of respiration. However, most dynamic global vegetation models failed to simulate the respiration reductions and the responses to hydrothermal conditions well. This study improves our understanding of boreal forest net carbon uptake in response to climate extremes and highlights an urgent need to improve vegetation models under global warming. |
| Publication Title | Nature Geoscience |
| Publication Date | Feb 1, 2026 |
| Publisher's Version of Record | https://doi.org/10.1038/s41561-025-01875-1 |
| OpenSky Citable URL | https://n2t.net/ark:/85065/d78k7fk4 |
| OpenSky Listing | View on OpenSky |
| CGD Affiliations | CAS |