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Updated: Dec 9, 2025
09:27
Wind Tunnel Experiments to Study Chaparral Crown Fires
Published on: November 14, 2017
10.0K
The propagule doesn't fall far from the tree, especially after short-interval, high-severity fire.
Nathan S Gill1, Tyler J Hoecker1, Monica G Turner1
1Department of Integrative Biology, University of Wisconsin-Madison, 430 Lincoln Drive, Madison, Wisconsin, 53706, USA.
Ecology
|September 10, 2020
Summary
Increased fire frequency limits tree regeneration. Young forests provide limited seed dispersal after fires, risking immaturity and hindering forest recovery. This impacts subalpine ecosystems facing climate change.
Area of Science:
- Forest ecology
- Fire ecology
- Climate change impacts
Background:
- Subalpine forests historically experienced 100-300 year fire intervals.
- Climate warming is increasing fire frequency, potentially before trees mature or produce seeds.
- Regeneration after short-interval fires (<30 years) depends on seed dispersal from surviving trees.
Purpose of the Study:
- To investigate how wind dispersal of conifer seeds varies with the age and structure of surrounding live forest edges.
- To understand seed delivery into recently burned areas after high-severity fire.
- To assess the impact of increasing fire frequency on forest regeneration potential.
Main Methods:
- Studied wind dispersal of Picea engelmannii, Abies lasiocarpa, and Pinus contorta var. latifolia seeds.
- Collected seeds using traps along 100-m transects extending from live forest edges of varying ages (18, 30, >100 years) into burned areas.
- Measured propagule pressure in live forests and analyzed seed delivery rates relative to distance, edge age, and tree height.
Main Results:
- Seed delivery into burned areas was significantly limited from young (18-year-old) forest edges, with dispersal concentrated within 10m.
- Older (>100-year-old) forest edges provided greater seed delivery, with dispersal extending up to 80m.
- Pinus contorta seeds were delivered more consistently than other conifers; overall seed delivery was low in over 70% of areas experiencing short-interval fires.
Conclusions:
- Limited seed dispersal from young forests poses a significant risk to tree regeneration in frequently burned subalpine ecosystems.
- The age and structure of surrounding live forests are critical factors influencing post-fire recovery.
- Increasing fire frequency exacerbates regeneration challenges, potentially leading to ecosystem immaturity and altered forest composition.
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