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• ~. <br />-2- Sandstone Breaks ;i53 <br />d. Wind velocities for the area average 2.3 to 4.7 miles {3.7 to <br />7.7 km) per hour and at•e prevailing from the southwest. Gener- <br />ally, February and May are the windiest months. Strong winds <br />during the spring cause rapid drying of the soil surface. <br />Relative humidity is low. The sun shines approximately 75 <br />percent of the time during the year. <br />3. Native (Climax Potential} Vegetation <br />a. <br />b <br />The plant community is about 75 percent grasses, 10 percent <br />forbs, and 15 percent shrubs air d,ry weight. <br />The production is predominantly made up of grasses. <br />The dominant grasses are short grasses and most abundant of the <br />grasses are blue grams, little bluestem, sideoats grams, hairy <br />grams, black grams, big bluestem, and western wheatgrass. Less <br />abundant grasses are needleandthread, New Mexico feathergrass, <br />bottlebrush squirreltail, galleta and yellow Indiangrass. Forbs <br />that make up the plant community are purple prairie clover, <br />scarlet globemallow, spreading eriogonum, wooly locoweed, dotted <br />gayfeather and threadleaf groundsel. <br />.` <br />Shrubs that occur on this site are fringed sagebrush, foutwing <br />saltbush, Gambel oak, small soapweed, plains pricklypear, skunk- <br />bush sumac, broom snakeweed, and true mountainmahogany. A <br />lightly stocked overstory of one seed juniper is usually present. <br />Relative percentage of total plant community by weight, air- <br />dry: <br />Symbol Common Name <br />Grasses and Grasslike Plants <br />ANGE <br />BOER4 <br />BOGR2 <br />SIHY <br />ARFE4 <br />HI.TA <br />BOHI2 <br />ORHY <br />SCSC* <br />MURI <br />STC04 <br />STNE2 <br />PIFI <br />KOCR <br />MUT02 <br />SPCR <br />BOCU <br />ANSA <br />big bluestem <br />black grams <br />blue grams <br />bottlebrush squirreltail <br />Fendler threeawn <br />galleta <br />hairy grams <br />Indian ricegrass <br />little bluestem <br />mat muhly <br />needleandthread <br />New Mexico feathergrass <br />pinyon ricegrass <br />prairie junegrass <br />ring muhly <br />sand dropseed <br />sideoats grams <br />silver bluestem <br />Scientific Name <br />Andropogon gerardii <br />Souteloua eriopoda <br />Souteloua gracilis <br />Sitanion hystrix(2) <br />Aristida fendleriana <br />Hilaria jamesii <br />Souteloua hirsuta <br />Oryzopsis hymenoides <br />Schizachyrium scoparium <br />Muhlenberia richardsonis <br />Stipa comata <br />Stipa neomexicana <br />Piptochaetium fimbriatum <br />Koeleria cristata <br />Muhlenbergia torreyi <br />Sporobolus cryptandrus <br />Souteloua curtipendula <br />Andropogon saccharoides <br />Percent <br />5-10 <br />10-20 <br />20-30 <br />o-lo <br />0-T <br />0-5 <br />5-20 <br />0- 3 <br />5-10 <br />0-T <br />3-IS <br />3-15 <br />o-1 <br />0-5 <br />0-T <br />0-5 <br />20-25 <br />1-3 <br />i. <br />