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Impact of Western Juniper on Hillslope Hydrology: Steens Mountain, OR

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

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Impact of Western Juniper on Hillslope Hydrology: Steens Mountain, OR

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  1. 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

  2. Background • 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

  3. Project Info Rainfall simulation plots were run on eight replicates of cut and uncut treatments.

  4. Vegetation Response Cut plot Un-cut plot

  5. Trough Water Cut plot Un-cut plot

  6. Removing Juniper decreases runoff volume

  7. Removing Juniper reduces sheet erosion

  8. Conclusion • 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.

  9. 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.

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