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Keyword: sagebrush steppe

Vegetation heterogeneity within and among prairie dog colonies on northern Great Plains grasslands

Projects Posted on: April 22, 2015
Areas inhabited by black-tailed prairie dogs are subject to continuous and intense disturbance by grazing and burrowing that directly and indirectly alter vegetation composition and structure compared to the surrounding uninhabited areas. The objective of this study is to evaluate patterns of vegetation heterogeneity within and among prairie dog colonies in the grasslands of the Northern Great Plains.

Plant establishment and soil microenvironments in Utah juniper masticated woodlands

Publications Posted on: September 19, 2013
Juniper (Juniperus spp.) encroachment into sagebrush (Artemisia spp.) and bunchgrass communities has reduced understory plant cover and allowed juniper trees to dominate millions of hectares of semiarid rangelands. Trees are mechanically masticated or shredded to decrease wildfire potential and increase desirable understory plant cover.

A strategy for maximizing native plant material diversity for ecological restoration, germplasm conservation and genecology research

Publications Posted on: June 25, 2013
One of the most important steps in planning a restoration project is careful selection of ecologically adapted native plant material. As species-specific seed zone maps are not available for most species in the Artemisia tridentata ssp.

Facilitation and interference of seedling establishment by a native legume before and after wildfire

Publications Posted on: September 27, 2011
In semi-arid ecosystems, heterogeneous resources can lead to variable seedling recruitment. Existing vegetation can influence seedling establishment by modifying the resource and physical environment. We asked how a native legume, Lupinus argenteus, modifies microenvironments in unburned and burned sagebrush steppe, and if L.

The role of symbiotic nitrogen fixation in nitrogen availability, competition and plant invasion into the sagebrush steppe

Publications Posted on: December 03, 2009
In the semi-arid sagebrush steppe of the Northeastern Sierra Nevada, resources are both spatially and temporally variable, arguably making resource availability a primary factor determining invasion success. N fixing plant species, primarily native legumes, are often relatively abundant in sagebrush steppe and can contribute to ecosystem nitrogen budgets.

Effects of water and nitrogen availability on nitrogen contribution by the legume, Lupinus argenteus Pursh

Publications Posted on: December 03, 2009
Nitrogen-fixing species contribute to ecosystem nitrogen budgets, but background resource levels influence nodulation, fixation, and plant growth. We conducted a greenhouse experiment to examine the separate and interacting effects of water and N availability on biomass production, tissue N concentration, nodulation, nodule activity, and rhizodeposition of Lupinus argenteus (Pursh), a legume native to sagebrush steppe.

Physiological and morphological characterization of basalt milkvetch (Astragalus filipes): Basis for plant improvement

Publications Posted on: September 25, 2009
Astragalus filipes Torr. ex A. Gray (basalt milkvetch or threadstalk milkvetch) is a legume that is widely distributed in western North America andholds promise for revegetation and restoration programs in the western United States. Seed of 67 accessions was collected in 2003 from Utah, Nevada, Idaho, Oregon, California, and Washington.

Spatio-temporal heterogeneity and habitat invasibility in sagebrush steppe ecosystems

Publications Posted on: April 07, 2009
Bromus tectorum L. (cheatgrass) is the most widespread invasive weed in sagebrushsteppe ecosystems. Invasion by Bromus tectorum produces large-scale changes ecosystem that negatively affect seedling establishment processes. Establishment of invasive and native species plays a key role in determining community invasibility and restoration potential.

Effects of nitrogen availability and cheatgrass competition on the establishment of Vavilov Siberian wheatgrass

Publications Posted on: December 17, 2008
Cheatgrass (Bromus tectorum L.) is the most widespread invasive weed in sagebrush ecosystems of North America. Restoration of perennial vegetation is difficult and land managers have often used introduced bunchgrasses to restore degraded sagebrush communities. Our objective was to evaluate the potential of 'Vavilov' Siberian wheatgrass (Agropyron fragile [Roth] P. Candargy) to establish on cheatgrass-dominated sites.

Variation in ant populations with elevation, tree cover, and fire in a pinyon-juniper-dominated watershed

Publications Posted on: March 14, 2008
Climate change and fire suppression have facilitated expansion of pinyon-juniper woodlands into sagebrush- steppe ecosystems of the Great Basin, USA, resulting in a loss of biological diversity.