Biogeosciences
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Articles | Volume 22, issue 23
Articles | Volume 22, issue 23
https://doi.org/10.5194/bg-22-7725-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Special issue:
https://doi.org/10.5194/bg-22-7725-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 22, issue 23
Research article
 | 
08 Dec 2025
Research article |  | 08 Dec 2025

Long-term forest-line dynamics in the French Pyrenees: an accelerating upward shift related to forest context, global warming and pastoral abandonment

Noémie Delpouve, Laurent Bergès, Jean-Luc Dupouey, Sandrine Chauchard, Nathalie Leroy, Erwin Thirion, and Cyrille B. K. Rathgeber

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Short summary
Worldwide, the upper forest line has climbed over the past decades, shaping mountain landscapes in response to global changes. Thanks to historical land-use maps, we documented the forest-line rise across the entire French Pyrenees and over a long time span. The forest line has moved upward since the 1850s, driven by the regional abandonment of grazing and the presence of the mountain pine. Despite the recent acceleration of this shift, the closed forest line has moved upward even faster.
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