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Alpine treeline ecotones world wide: fine-scale spatial patterns and environmental controls.
Yuyang Xie1,2, Maaike Y Bader3, Xiao Feng2
1Institute of Ecology, College of Urban and Environmental Sciences, Peking University, Beijing, 100871, China.
The New Phytologist
|July 14, 2026
Summary
Alpine treeline ecotones exhibit predictable global patterns. Environmental factors like snow and wind influence tree cover distribution, aiding climate change forest expansion predictions.
Area of Science:
- Ecology
- Biogeography
- Remote Sensing
Background:
- Alpine treelines represent the upper limit of tree growth.
- Treeline ecotones beneath this limit show varied spatial patterns.
- Global quantification of these patterns and their drivers is lacking.
Purpose of the Study:
- To globally characterize fine-scale treeline-ecotone spatial patterns.
- To identify environmental drivers of these patterns.
- To develop a method for predicting forest expansion under climate change.
Main Methods:
- Utilized very-high-resolution satellite imagery.
- Applied landscape metrics to describe tree cover distribution.
- Used principal component analysis to analyze spatial patterns.
Main Results:
- Tree cover variations are described by patchiness and complexity.
- Patchy ecotones are linked to high snow, wind, and topographic relief.
- Genus-specific patterns observed (e.g., Pinus patchier, Nothofagus discrete).
Conclusions:
- Alpine treeline ecotones display predictable global spatial patterns.
- These patterns offer insights into ecotone formation and dynamics.
- The method serves as an indicator for predicting forest expansion with climate change.
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