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Uppermost global tree elevations are primarily limited by low temperature or insufficient moisture.
Yuyang Xie1, Zehao Shen1, Tao Wang2
1College of Urban and Environmental Sciences and MOE Laboratory for Earth Surface Processes, Peking University, Beijing, China.
Global Change Biology
|April 2, 2024
Summary
Global warming is pushing trees higher up mountains. Drought, not just temperature, is the main reason alpine treelines are shifting globally, impacting ecosystems.
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.
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