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' • iintlGL s i rL N6. zsl, LOAMY FOOTHILLS n~nlu sr 1975 Pago 3 Native (po R:nlial) Vegetation and Guide for Determining Range Condition. Percentage cor~il~osi[ion by weight of Che principal Species may total as nn,ch as: Western whea[yrass ---- Muttongrass Junegrass ----- Needle-and-thread Indian ricegrass -- Bottlebrush squirrel tail Big sagebrush Dlack sagebrush Antelope bitterbrush - Utah serviceberry True mountain mahogany.- Douylas rabbftbrush Others (listed above) --- _ ;0 30 -5 5 5 ~p~Total of 15g -5 5 -- 5 5 - 15 Heavy grazing use can aid the establishment of pinyon and juniper seedlings through reduced competition, exposure of .,"'y mineral soil, and reduction of fuel to carry fires. This, -: .p. a . 9. combined with increasing control of fires, has caused large _ portions of the site to be taken over by pinyon and Juniper '~ ,,.., since the coming of livestock. Other species most likely to Invade the site ur Increase froa+ • • trace amounts if cover deteriorates, are rubber rabbftbrush, snakeweed, cheatgrass, Colorado rubberweed, and several annual fortis. Sagebrustr often assumes a dominant position as the - ,,,; ecological condition deteriorates and pinyon and Juniper have not taken over. ~ , 4. Total Annual Production Favorable years 1500 Pounds per Acre Air Ory - Unfavorahle years 800 " " " " " •` ° Median years 1100 " " " " " ~~ 'i. soil~• ., a. M„•.l of the •,oils have developed nn loess overlying sandstons ter- ;hale, but some are of alluvial origin. The dominant losas.~ soils are reddish in color. Surface textures are loam to floe • sandy loam, and there is generally a well developed textural B horizon which contributes to high moisture storage ea paGity.