ClimateOpenAlex
Ranked by formulaVerdict: NotableGlobal patterns of treeline predictability and the gap between the forest and the treeline
The alpine treeline is the highest elevation at which trees can grow, which is assumed to be controlled by temperature and globally predictable.
Key numbers
- 58% of UFL pixels located
VerdictWorth a reader's time today.
Abstract
The alpine treeline is the highest elevation at which trees can grow, which is assumed to be controlled by temperature and globally predictable. However, many upper forest limits (UFLs) do not reach this elevation, due natural factors and human disturbance. A large elevational distance between UFLs and the climatic treeline can indicate that human activities have removed mountain forest or prevented it from tracking treeline under climate warming. We therefore aimed to map these distances globally as an indication of the conservation status of upper‐montane ecosystems. To obtain a reliable baseline and to evaluate global treeline predictability, we validated an existing treeline‐elevation model with 1241 globally‐distributed observations. Treeline was predicted well, but notably at too‐low elevations in some dry subtropical and very oceanic temperate regions, especially southern Patagonia. After correcting these non‐random geographical patterns, we determined the elevational distance between corrected modelled treelines and observed UFLs at a 30‐arc‐second resolution. Globally, UFLs were located 358 ± 313 m below treeline elevation, with 58% of UFL pixels located within 500 m, with smallest distances in the boreal zones and largest in tropical and subtropical America and Africa. Elevational distance was positively related to fire frequency in the last 20 years and to human footprint. We thus show that 1) the climatic predictability of treeline elevation is less globally universal than previously thought and requires more elaborate models or better climate data, and 2) the vast majority of current upper forest limits are located below treeline elevation, partly for natural reasons, but probably largely due to millennia of human use of high‐elevation ecosystems. These results provide a basis for further research into the drivers of global treeline position, for the conservation and management of montane and alpine areas, and for understanding under which conditions UFLs can move upwards in response to climate change.
The editor's rubric
- Leverage3 / 5
- A method or resource many groups across the field will adopt within a year.
- Magnitude2 / 5
- Solid incremental gain on a meaningful problem.
- Evidence3 / 5
- Solid: multiple benchmarks or cohorts, ablations, fair baselines, released code or data.
- Novelty3 / 5
- A genuinely new approach to an open problem.
- Trajectory2 / 5
- Some room to improve with obvious engineering.
- Stakes3 / 5
- Meaningful benefit to many people within a few years.
Editor’s rationale
Heuristic triage from title and abstract text only, not a reading of the paper. Cues found: breadth (general-purpose); novelty (contrary to expectation, open problem); verification (error bars, experimental validation); stakes (global scale, climate).
How the score was computed
Desks place stronger verdicts first, then use this score to order work within the same verdict.
- Merit
- 5.3 / 10
- Adjusted merit
- 4.6 / 10
- Attention
- 0%
- Freshness
- 85%
- Citations0 (reference 15, via openalex, Oct 22, 2026, 07:29 UTC)