Kirk W. Davies
U.S. Department of Agriculture, ARS
Dr. Davies is a Rangeland Scientist with the USDA-Agricultural Research Service at the Eastern Oregon Agricultural Research Center in Burns, OR. He received a dual B.S. (2000) in Rangeland Resources and Crop & Soil Science from Oregon State University and a Ph.D. (2005) in Rangeland Resources from Oregon State University. Dr. Davies joined the USDA-Agricultural Research Service as a Rangeland Scientist in October 2006.
Dr. Davies research focuses on vegetation patterns, disturbance ecology, climate and management influences on rangeland vegetation, sagebrush-bunchgrass community ecology, and invasive plant prevention, control, and ecology.
Current Research Projects:
- Resource islands and vegetation heterogeneity in sagebrush plant communities
- Ecology and prevention of exotic annual grass invasion
- Impacts of exotic annual grass invasions
- Identifying characteristics of invasion resistant plant communities
- Revegetation of exotic annual grass invaded plant communities
- Prior disturbance impacts on subsequent disturbances
- Pre- and post-fire management influence on plant community ecology
- Wyoming and mountain big sagebrush plan community ecology
- Influence of disturbances on wildlife habitat in the sagebrush steppe
- Insect response to distrubances in sagebrush plant communities
- Feral (wild) horse impacts to riparian areas and adjacent uplands
- Influence of climate and soils on native vegetation cover, density, and production
Recent Peer-Reviewed Journal Articles:
Davies, K.W., C.S. Boyd, D.D. Johnson, A.M. Nafus, and M.D. Madsen. 2015. Success of Seeding Native Compared to Introduced Perennial Vegetation for Revegetating Medusahead-invaded Sagebrush Rangeland. Rangeland Ecology & Management 68:224-230.
Nafus, A.M., T.J. Svejcar, D.C. Ganskopp, and K.W. Davies. 2015. Abundances of Co-planted Native Bunchgrasses and Crested Wheatgrass After 13 Years. Rangeland Ecology and Management 68:211-214.
Johnson, D.D., and K.W. Davies. 2014. Effects of integrating mowing and imazapyr application on African rue (Peganum harmala L.) and native perennial grasses. Invasive Plant Science and Management 7:617-623.
Bates, J.D., R. O’Connor and K.W. Davies. 2014. Vegetation recovery and fuel reduction after seasonal burning of Western Juniper. Fire Ecology, Vol 10, Issue 3: 27-48.
Davies, K.W., M.D. Madsen, A.M Nafus, C.S. Boyd, and D.D. Johnson. 2014. Can imazapic and seeding be applied simultaneously to rehabilitate medusahead-invaded rangeland? Single vs. multiple entry. Rangeland Ecology and Management 67:650-656.
Davies, K. W., G. Collins, and C. S. Boyd. 2014. Effects of feral free-roaming horses on semi-arid rangeland ecosystems: an example from the sagebrush steppe. Ecosphere 5(10):127.
Davies, K.W., and J.D. Bates. 2014. Attempting to restore herbaceous understories in Wyoming big sagebrush communities with mowing and seeding. Restoration Ecology 22:608-615.
Kyser, G.B., J.M. DiTomaso, K.W. Davies, J.S. Davy, and B.S. Smith. 2014. Medusahead Management Guide for the Western States. University of California, Weed Research and Information Center, Davis. 68 p. Available at: wric.ucdavis.edu.
Nafus, A.M. and K.W. Davies. 2014. Medusahead Ecology and Management: California Annual Grasslands to the Intermountain West. Invasive Plant Science and Management 2014 7:210-221.
Davies, K.W., D.D. Johnson, and A.M. Nafus. 2014. Restoration of Exotic Annual Grass-invaded Rangelands: Importance of Seed Mix Composition. Invasive Plant Science and Management 7:247-256.
Boyd, C.S., D.D. Johnson, J.D. Kerby, T.J. Svejcar, and K.W. Davies. 2014. Of Grouse and Golden Eggs: Can Ecosystems Be Managed Within a Species-Based Regulatory Framework? Rangeland Ecol Manage 67:358-368.
Bates, J.D. and K.W. Davies. 2014. Cattle Grazing and Vegetation Succession on Burned Sagebrush Steppe. Rangeland Ecol Manage 67:412-422.
Davies, K.W., J.D. Bates, C.S. Boyd, and A.M. Nafus. 2014. Is fire exclusion in mountain big sagebrush communities prudent? Soil nutrient, plant diversity, and arthropod response to burning. International Journal of Wildland Fire 23:417-424.
Davies, K.W., J.D. Bates, M.D. Madsen, and A.M. Nafus. 2014. Restoration of Mountain Big Sagebrush steppe following prescribed burning to control western juniper. Environmental Management 53:1015-1022.
Davies, K.W., M. Vavra, B. Schultz, and N. Rimbey. 2014. Implications of longer term rest from grazing in the sagebrush steppe. Journal of Rangeland Applications Vol. 1 (2014):14-34.
Madsen, M.D., K.W. Davies, D.L. Mummey and T.J. Svejcar. 2014. Improving restoration of exotic annual grass-invaded rangelands through activated carbon seed enhancement technologies. Rangeland Ecology and Management 67(1):61-67.
Bates, J.D., R.N. Sharp, and K.W. Davies. 2014. Sagebrush steppe recovery after fire varies by development phase of Juniperus occidentalis woodland. International Journal of Wildland Fire 23:117-130.
Madsen, M.D., K.W. Davies, C.S. Boyd, J.D. Kerby, D.L. Carter, and T.J. Svejcar. 2013. Restoring North America’s Sagebrush Steppe Ecosystem Using Seed Enhancement Technologies. Proceedings of the International Grassland Congress, Sydney, Australia – September 15-19, 2013. (Peer-Reviewed Conference Proceedings).
Davies, K.W., C.S. Boyd, and A.M. Nafus. 2013. Restoring the Sagebrush Component in Crested Wheatgrass-Dominated Communities. Rangeland Ecology & Management 66:472-478.
Davies, K.W. and A.M. Nafus. 2013. Exotic Annual Grass Invasion Alters Fuel Amounts, Continuity and Moisture Content. International Journal of Wildland Fire 2013, 22: 353-358.
Davies, K.W., A.M. Nafus, and D.D. Johnson. 2013. Are Early Summer Wildfires an Opportunity to Revegetate Exotic Annual Grass-Invaded Plant Communities? Rangeland Ecology & Management, Society of Range Management, March 2013:66:234-240.
Davies, K.W., A.M. Nafus, and M.D. Madsen. 2013. Medusahead Invasion Along Unimproved Roads, Animal Trails, and Random Transects. Western North American Nauralist 73:54-59.
Davies, K.W., J.D. Bates, and A.M. Nafus. 2012. Mowing Wyoming Big Sagebrush Communities with Degraded Herbaceous Understories: Has a Threshold Been Crossed? Rangeland Ecology & Management, 65 (5): 498-505.
Boyd, C.S. and K.W. Davies. 2012. Differential Seedling Performance and Environmental Correlates in Shrub Canopy vs. Interspace Microsites. Journal of Arid Environmental 87 (2012) 50-57.
Boyd, C.S. and K.W. Davies. 2012. Spatial Variability in Cost and Success of Revegetation in a Wyoming Big Sagebrush Community. Environmental Management (2012) 50: 441-450.
Davies, K.W., J.D. Bates and A.M. Nafus. 2012. Comparing Burned and Mowed Treatments in Mountain Big Sagebrush Steppe. Environmental Management (2012) 50:451-461.
Davies, K.W., J.D. Bates, and A.M. Nafus. 2012. Vegetation response to mowing dense mountain big sagebrush stands. Rangeland Ecology and Management 65:268-276.
Madsen, M.D., K.W. Davies, C.J. Williams, T.J. Svejcar. 2012. Agglomerating seeds to enhance native seedling emergence and growth. Journal of Applied Ecology 49:431-438.
Johnson, D.D. and K.W. Davies. 2012. Medusahead Management in Sagebrush-Steppe Rangelands: Prevention, Control, and Revegetation. Society of Range Management, Rangelands, 34(1):32-38.
Johnson, D.D., K.W. Davies, P.T. Schreder and A.M. Chamberlain. 2011. Perceptions of Ranchers About Medusahead Management on Sagebrush Steppe Rangelands. Environmental Management 48:400-417.
Davies, K.W., J.D. Bates, and A.M. Nafus. 2011. Are There Benefits to Mowing Wyoming Big Sagebrush Plant Communities? An Evaluation in Southeastern Oregon. Environmental Management 48:539-546 .
Davies, K.W. 2011. Plant community diversity and native plant abundance decline with increasing abundance of an exotic annual grass. Oecologia 167:481-491.
Davies, K.W., C.S. Boyd, J.L. Beck, J.D. Bates, T.J. Svejcar, and M.A. Gregg. 2011. Saving the sagebrush sea: An ecosystem conservation plan for big sagebrush plant communities. Biological Conservation 144: 2573-2584.
Bates, J.D., K.W. Davies, and R.N. Sharp. 2011. Shrub-steppe early succession following invasive juniper cutting and prescribed fire. Environmental Management 47:468-481.
Davies, K.W. and D.D. Johnson. 2011. Are we “missing the boat” on preventing the spread of invasive plants in rangelands. Invasive Plant Science and Management 4:166-171.
Davies, K.W. and R.L. Sheley. 2011. Promoting native vegetation and diversity in exotic annual grass infestations. Restoration Ecology 19:159-165.
Davies, K.W., J.D. Bates, T.J. Svejcar, and C.S. Boyd. 2010. Effects of long-term livestock grazing on fuel characteristics in rangelands: an example from the sagebrush steppe. Rangeland Ecology & Management 63:662-669.
Davies, K.W., S.L. Petersen, D.D. Johnson, D.B. Davis, M.D. Madsen, D.L. Zvirzdin, and J.D Bates. 2010. Estimating juniper cover from NAIP imagery and evaluating relationships between potential cover and environmental variables. Rangeland Ecology & Management 63:630-637.
Davies, K.W. 2010. Revegetation of medusahead-invaded sagebrush steppe. Rangeland Ecology and Management 63:564-571.
Davies, K.W., and J.D. Bates. 2010. Native perennial forb variation between mountain big sagebrush and Wyoming big sagebrush plant communities. Environmental Management 46:452-458.
Davies, K.W., A.M. Nafus, and R.L. Sheley. 2010. Non-native competitive perennial grass impedes the spread of an invasive annual grass. Biological Invasions 12:3187-3194
Davies, K.W. and J.D. Bates. 2010. Vegetation characteristics of mountain and Wyoming big sagebrush plant communities in the northern Great Basin. Rangeland Ecology & Management 63:461-466
Rhodes, E.C., J.D. Bates, R.N. Sharp, and K.W. Davies. 2010. Fire effects on cover and dietary resources of sage-grouse habitat. Journal of Wildlife Management 74:755-765
Boyd, C.S., and K.W. Davies. 2010. Shrub microsite influences post-fire perennial grass establishment. Rangeland Ecology & Management 63:248-252
For more information phone or email Dr. Davies at:
(541) 573-4074 or Kirk Davies