Western Juniper's Growing Influence in Eastern Oregon Estimated Acreage 1936 1988 > 10 percent cover 420, 000 2. 2 million Total area with juniper 6 million Volume of current stand 467 million cubic feet Private landowners own 58 percent of the area and 49 percent of the volume BLM is the principle owner of public lands with juniper - 79 percent of publicly owned juniper forest Over 1/2 of the present juniper forest became established between 1850 and 1900 (greatest increase came between (1879 and 1918). Rate of Establishment 1650 - 1800 2900 acres / year 1800 - 1850 8200 acres / year 1850 - 1900 23, 100 acres / year 1900 - 1940 6000 acres / year 52 percent of juniper grows in the 10 - 15 inch precipitation zone 41 percent of juniper grows between 4000 - 5000 ft. in elevation Juniper crown intercepts more that 1/2 of the annual precipitation Juniper transpires water year round compared to seasonal transpiration of other vegetation Juniper roots can extend several times the crown diameter Almost 50 percent of juniper forests have crown covers 10-20 percent Juniper woodlands have up to 10 times the erosion rate of sagebrush - grass ecotype's (Buckhouse et. al.
) Average cubic volume of wood per acre in juniper forests is 200 cubic feet Over half the area of juniper forests have fewer than 50 trees per acre Counties with more that 1/2 million acres of juniper Crook 857, 000 Harney 884, 000 Grant 539, 000 Jefferson 582, 000 Information from: Ged ney, D. R. et. al. (1999).
Western Juniper in Eastern Oregon. USDA Forest Service. Pacific Northwest Research Station. General Technical Report, PNW-GTR-464, November 1999. Buckhouse, J. et al.
(1982). Potential Sediment Production within Vegetative Communities in Oregon's Blue Mountains. Journal of Soil and Water Conservation. Vol.
37, Number 2. Pgs. 120 - 122. Tim DeboodtOSU Crook County Extension Agent Prineville, OR The Drying of Oregon Potential water use of Western Juniper within current juniper area 500, 000 acre feet to 920, 000 acre feet per year This is the equivalent of a river flowing year round at 680 to 1000 cos per day Enough water to supply over 500, 000 households per day (1000 gallons / household /day) Enough water to irrigate 160, 000 to 300, 000 acres annually (3 ac. ft.
water right) Assumptions 12" diameter trees 50 trees per acre 25 gals per tree per day for 60 days per year = . 0046 acre feet per tree per year Between 2. 2 million and 4 million acres of juniper (Based on USFS inventory, 1988.