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Effects of forest restoration treatments and wildfires on tree spatial patterns in the Colorado Front Range
2:00 PM - 2:20 PM
Tue Nov 28, 2017


Authors: Jeffery B. Cannon; Marin E. Chambers; Jennifer S. Briggs

In the Colorado Front Range, the Collaborative Forest Landscape Restoration Program (CFLRP) has planned or implemented over 8,000 ha of restoration treatments. A key objective of these treatments is to restore complex spatial patterns that historically characterized lower elevation ponderosa pine forests such as a mosaic of gaps and openings. Spatial patterns shape ecological functions such as forest dynamics, understory diversity, and wildlife habitat. Given the high cost of mechanical thinning treatments, interest in utilization of managed (“resource objective”) wildfires has recently increased. We used supervised classification of satellite imagery to examine how CFLRP treatments in ponderosa pine forests of the Colorado Front Range alter spatial patterns including gap size distributions. We compare the outcomes of restoration treatments (ranging in size from 50 to 1200 ha) to low- to moderate-severity portions of wildfires. In general, both mechanical treatments and low- to moderate-severity portions of wildfire reduce canopy cover and alter gap size metrics. We discuss (1) topographic factors related to changes in gap characteristics, (2) the relevance of findings to ongoing CFLR monitoring of understory plant and wildlife communities, and (3) the implications of our findings for restoration and management of ponderosa pine forests.

Jeffery B Cannon
Research Associate, Colorado Forest Restoration Institute

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