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• on well-drained slopes that because Gt shallow soils have not c,2en ecnverted <br />to agricultural production. Eighteen species c,~re enwuntered in rover ruaarats <br />during 1979 vegetation studies G•faria~ Associates 1979). The type is charac- <br />terized by Basin big sagebrush (Arte.-risia trideniaLa). Comron understory <br />species include: cheatgrass brome (Bromus tectorUn), redstem filaree (Ero~'i1.:.~ <br />cicutarium), Russianthistle (Saisola ;;all), and tu;:oiing hedgemustard <br />(Sisymbrium altissinnII*i) . <br />Upland sagebrush sites sampled on the Nucla study area during 1979 e:chibited <br />a total vegetative basal rover of 13.4€. Basin big sagebrush evidenced the <br />highest percent basal cover of any species on this typz (4.48) (Marian Asso- <br />ciates 1879). <br />Grassland_~asture vegetation type. The grassland pasture vegetation t}~pe witlur, <br />the stony area occupies 24.69 acres or 23.3b of the total study area. Grassland <br />is the Trost predominant vegetation type on lands not currently disturber: or <br />subjected to agricultural production. However, this type is an abandoned hay <br />• pasture as evidenced by the many vegetation species indicative of its past <br />agricultural use and present disturbed nature. Interviews with local ranchers <br />and Nucla Dtine personnel indicate that much of the area naw in grassland on the <br />Nucla permit was abandoned in 1975. Prior to abandonrent, these areas were <br />planned alfalfa fields. Weedy, undesirable species such as field bi-~dweed <br />(Conwlvulus arvensis) , and com:nn r2~~ssianthistle (Salsola kali) are w ~:ron <br />on this type. <br />'Ibtal vegetative basal weer for the grassland vegetation type in 1979 was <br />estimated at 9.78. Weedy species accounted for over 378 of the total rover <br />(Marian Associates 1979). <br />Total 1979 vegetative production at grassland sites was 815.1 lbs/acre. Dtuch <br />of the total production was attributed to unidentified perennial grasses and <br />annual fortis (Nariah Associates 1979). <br />Agricultural vegetation type. Agricultural lands comprise the largest type <br />on the study area accounting for 44.59 acres. These lands were planted <br /> <br />-17- <br />SUM 1 S 1960 <br />