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Uppermost global tree elevations are primarily limited by low temperature or insufficient moisture.

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Global warming is pushing trees higher up mountains. Drought, not just temperature, is the main reason alpine treelines are shifting globally, impacting ecosystems.

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Area of Science:

  • Ecology
  • Climate Change Science
  • Biogeography

Background:

  • Anthropogenic global warming causes upward tree dispersal at alpine treelines.
  • Understanding treeline elevation shifts is vital for ecosystem response to climate change.
  • Global patterns and drivers of alpine treelines are poorly understood due to data limitations.

Purpose of the Study:

  • To construct a global dataset of uppermost tree distribution.
  • To identify key drivers of alpine treeline elevation.
  • To explain divergent treeline responses to climate warming.

Main Methods:

  • Utilized Google Earth imagery to create a quasi-observational dataset of global uppermost tree distribution.
  • Validated the 6.6°C growing-season isotherm as a global thermal treeline indicator.
  • Analyzed deviations from thermal treelines and identified driving factors.

Main Results:

  • Approximately two-thirds of uppermost tree distribution records deviated significantly from the thermal treeline.
  • Drought conditions were the primary driver in 51% of deviations.
  • Mountain elevation effect (surface heat) was the second most important driver (27%).

Conclusions:

  • Alpine treeline elevation is influenced by multiple factors beyond temperature, including moisture and disturbance.
  • Drought stress is a critical factor limiting upward tree migration.
  • Understanding these multifaceted drivers is essential for predicting future treeline dynamics under global warming.