Keeping Trees Where They Belong
When trees like pinyon and juniper encroach into healthy sagebrush range, sage grouse, songbirds, and other wildlife suffer. We defend core sagebrush areas from encroachment and remove trees when opportunities present.
Conifer expansion results in sagebrush wildlife habitat loss and fragmentation, reduced forage production, decreased resilience to fire and less resistance to cheatgrass invasion. WLFW’s Framework seeks to maintain and grow intact sagebrush rangeland cores through conifer removal in priority landscapes at a pace that exceeds the rate of expansion.
WLFW’s approach for tackling this threat prioritizes the maintenance of treeless sagebrush rangelands and restoration of early phase expansion areas. Conifer removal is focused along woodland fringes to maintain and grow sagebrush rangeland cores and sage grouse populations, as opposed to isolated cuts in a sea of forested land.
Pinyon Juniper Encroachment Education Project
The Pinyon Juniper Encroachment Education Project website provides a science-based resource to help people better understand the science and management around woodland encroachment in sagebrush ecosystems.
Sagebrush ecosystems across the West are struggling to thrive amidst numerous threats, and these ecosystems are critical for biodiversity, wildlife habitat, rural livelihoods, economies, and traditional uses. Alongside invasive annual grasses and land use conversion, tree expansion or encroachment into historic shrublands is among the primary threats to the sagebrush biome.
Rangeland Vulnerability to Tree Encroachment
This map depicts rangeland vulnerability to tree encroachment across the sagebrush biome, annually 1984-present. The categorical representation and color map is based on the Twidwell's 2022 "Vulnerability Guide."
Intact/green (0-1%); Dispersal/yellow (2-10%), Encroached/red (11-20%), and Forest/gray (>=21%). It can be used for identification of relatively treeless core areas for proactive management and to monitor effectiveness through time.
Ecosystem Resilience and Resistance
This map provides a tool for rapid risk assessment across the range of sage-grouse using an index of sagebrush ecosystem resilience to disturbance and resistance to cheatgrass (“R&R”). It was derived using soil temperature and moisture data to depict underlying abiotic conditions that influence R&R. It can be used to assess relative recovery potential after disturbance and inform the level of restoration intervention that may be needed.
These maps provide annual percent cover estimates from 1984 to present of: annual forbs and grasses, perennial forbs and grasses, shrubs, trees, and bare ground. The data can be used to assess biotic conditions to inform management actions and monitor vegetation through time. Annual forb and grass maps provide a useful surrogate for exotic annuals, allowing managers to understand fluctuations through time and track management outcomes. Perennial forb and grass maps can help managers determine if restoration seeding is needed following disturbance or annual grass control.
These maps provide annual and 16-day aboveground biomass from 1986 to present of: annual forbs and grasses, perennial forbs and grasses, and herbaceous (combination of annual and perennial forbs and grasses). Estimates represent accumulated new biomass throughout the year or 16-day period and do not include biomass accumulation in previous years. The data can be used to assess fine fuels affecting fire cycles and forage availability. Annual forb and grass maps provide a useful surrogate for exotic annuals, allowing managers to understand fluctuations through time and track management outcomes.