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Impact of Western Juniper on Hillslope Hydrology: Steens Mountain, OR. USDA-ARS Rangeland Research Unit Burns, OR USDA-ARS Northwest Watershed Research Unit Boise, ID. Background. 8.5 million acres in western juniper woodland 95% of the woodlands are 100 years old or less - PowerPoint PPT Presentation
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Impact of Western Juniper on Impact of Western Juniper on Hillslope Hydrology: Hillslope Hydrology: Steens Mountain, ORSteens Mountain, OR
USDA-ARS Rangeland Research Unit Burns, OR
USDA-ARS Northwest Watershed Research Unit Boise, ID
BackgroundBackground
• 8.5 million acres in western juniper woodland• 95% of the woodlands are 100 years old or
less• Juniper invasion results in
Significant reductions in shrub/understory production and cover
Reduced plant diversity Loss of wildlife habitat Increased erosion potential
Project InfoProject Info
Rainfall simulation plots were run on eight replicates of cut and uncut treatments.
Vegetation ResponseVegetation Response
Cut plot Un-cut plot
Trough WaterTrough Water
Cut plot Un-cut plot
Removing Juniper decreases runoff volume
Removing Juniper reduces sheet erosion
ConclusionConclusion
• Juniper invasion can result in a dramatic increase in runoff and erosion. The severity of erosion will likely be related to the loss of understory cover and the erosion potential of a site.
Questions?Questions?
For more information contact:
Jon Bates or Tony Svejcar,
USDA-ARS Rangeland Scientists
(541) 573-8900
or
Fred Pierson
USDA-ARS Research Hydrologist
(208) 422-0700.