Fire effects in sagebrush communities - the good, the bad, and the in-between.
Davies KW, Ellsworth LM, Bates JD, Wollstein K
Invasive Species
If you've hiked through the wide-open sagebrush country of the West, the fate of that landscape — and the pronghorn, sage-grouse, and jackrabbits living in it — now hinges on whether land managers can predict when fire helps versus when it opens the door to invasive grasses that crowd out everything native.
Sagebrush covers a huge swath of western North America, and fire has always been part of that ecosystem — but it's not a simple story. In cooler, moister areas, occasional fires keep juniper trees from taking over and actually keep the land healthier. In hotter, drier spots, fires are increasingly problematic because weedy invasive grasses move in afterward and take over, making the next fire worse and preventing sagebrush from coming back.
Key Findings
The 71 million hectare sagebrush ecosystem shows strongly split outcomes: cooler, wetter communities are resilient to periodic fire and need it to prevent conifer encroachment, while hotter, drier communities face greater risk of invasive annual grass takeover after burns.
Pre-fire community condition is the strongest predictor of post-fire recovery — landscapes in good condition before a fire are likely to recover well, while degraded landscapes tend to fare worse.
Post-fire restoration with native vegetation can offset negative outcomes, but success rates are significantly lower in hot, dry sagebrush communities, making pre-fire prioritization and wildfire suppression decisions critical.
chevron_right Technical Summary
Whether fire helps or harms sagebrush landscapes depends heavily on local climate and existing plant health. Cooler, wetter sagebrush areas benefit from periodic fire, while hotter, drier areas are increasingly damaged by it due to invasive grasses that thrive after burns.
Abstract Preview
Periodic to infrequent fire in the 71 million ha sagebrush ecosystem of North America historically shifted dominance from sagebrush to herbaceous vegetation, and limited conifer encroachment. Large...
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Species Mentioned
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Sagebrush is the common name of several woody and herbaceous species of plants in the genus Artemisia. The best-known sagebrush is the shrub Artemisia tridentata. Sagebrush is native to the western half of North America.