The invasion of annual grasses, an unprecedented rise in wildfire, and encroachment by conifers have substantially contributed to a 50-percent reduction in Oregon’s sagebrush ecosystem over the past 150 years. Such extensive habitat reduction has led to declines in wildlife and generated an intense focus on the management of remaining sagebrush habitats. As a result, land managers, with limited resources, need to work at large spatial scales to address these ecological threats.
Oregon State University's Sage-Steppe Habitat Team was created in 2016 to fill research and Extension needs associated with threats to the sagebrush steppe ecosystem and sagebrush-obligate wildlife. The team's involvement in the SageSHARE group, consisting of federal and non-profit partners, led to the creation of the Threat-Based Land Management framework, focused on how invasive annual grasses and conifer encroachment affect the sagebrush ecosystem. Such a framework is complex enough to inform management decisions while remaining simple enough for use by all stakeholders.
The result of this framework is the to support management objectives and conservation practices. The illustrated guide provides a framework to efficiently identify, discuss, and address landscape-level threats. It takes users step by step through establishing management objectives, understanding the relevant ecology of a large and diverse landscape, assessing threats in order to map simplified ecological states, and estimate future trends.
The Threat-Based Land Management approach and associated field guide is being applied on over 7 million acres of private and public lands across Oregon, Nevada, Idaho and Wyoming. Over 2,000 copies of the guide have been distributed to both domestic and international audiences, with requests continuing to come in. This approach supports conservation plans to implement conifer removal, annual grass treatment, improved grazing practices and wildlife conservation on public, state and private land.