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Updated: Feb 14, 2026

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Moisture availability limits subalpine tree establishment.

Robert A Andrus1, Brian J Harvey2, Kyle C Rodman1

  • 1Department of Geography, University of Colorado, Boulder, Colorado, USA.

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PubMed
Summary
This summary is machine-generated.

Climate warming may decrease Engelmann spruce and subalpine fir seedling establishment in the Rocky Mountains. Favorable conditions require high soil moisture from snowpack and cool summers, which are declining due to warming temperatures.

Keywords:
Colorado Front RangeEngelmann spruceclimate changesouthern Rocky Mountainssubalpine firsubalpine forest

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Area of Science:

  • Ecology
  • Climate Science
  • Forestry

Background:

  • Temperate coniferous forests rely on favorable climate for seedling establishment.
  • Understanding past establishment events informs future forest composition under climate change.
  • Previous research focused on alpine treelines, leaving gaps in knowledge for Engelmann spruce and subalpine fir across their elevation range.

Purpose of the Study:

  • To investigate the climate conditions influencing Engelmann spruce (Picea engelmannii) and subalpine fir (Abies lasiocarpa) seedling establishment.
  • To assess the impact of climate variability on these species across a moisture gradient in the Colorado Front Range.
  • To project future tree establishment trends in response to climate warming.

Main Methods:

  • Collected annual germination dates for over 450 Engelmann spruce and 500 subalpine fir seedlings.
  • Analyzed germination data against climate variability along a complex topographic-moisture gradient.
  • Compared establishment patterns with climate data from 1975-2010.

Main Results:

  • Engelmann spruce and subalpine fir exhibited episodic establishment, synchronized across the study area.
  • Successful establishment events correlated with high soil moisture, linked to above-average snowpack and cool, wet summers.
  • From 1975-2010, a decline in establishment events coincided with reduced snowpack, rising summer temperatures, and increased moisture deficits.

Conclusions:

  • Climate warming is driving increased moisture deficits, negatively impacting Engelmann spruce and subalpine fir establishment.
  • Contrary to findings in maritime forests, recruitment is likely to decline in moisture-limited subalpine forests.
  • Future warming trends may reduce forest cover persistence in the core of these species' ranges.