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• feet tall. Understory species were similar to that of the meadow vegetation <br />type. Numerous weedy species were observed in the understory including Canada <br />thistle, rubber rabbitbrush, Great Basin wildrye, burdock and Kentucky <br />bluegrass. <br />3.3.8 Agricultural <br />Small areas of hay meadows occur within the main portion of the study <br />area and along the proposed railroad corridor adjacent to Good Spring Creek. <br />(Figure 3.19). Timothy, orchard grass and wheatgrasses comprised the majority <br />of the grasses in the hay meadows. <br />Cultivated areas occurred along the proposed railroad corridors. Barley, <br />wheat and oats are the most frequently cultivated species. <br />3.4 SAMPLE ADEQUACY ANO EQUIVALENCY <br />In general, an adequate sample was achieved for all parameters in all <br />. native vegetation types sampled (Table 3.9 ). An adequate sample for cover <br />was generally achieved with 15 study sites. An adequate sample for <br />production, however, depended upon the vegetation type. The mountain shrub <br />and aspen vegetation types had lower variability than other types and <br />therefore fewer samples needed to be obtained. The sagebrush grassland <br />vegetation type because of the many phases within the type, was quite <br />variable and as such more samples needed to be taken to adequately sample the <br />type. <br />All reference areas were considered equivalent in terms of vegetation <br />cover, production and species diversity (Table 3.10). Reference areas selec- <br />ted generally had a higher total vegetation cover and a higher production in <br />all reference areas (except the aspen reference area) and also had a higher <br />22 <br />"'""`" "'"'""" """' ""' """' '°' ~"~zhitiit"16, Cfem 5~ ~~~ ~ °~~~ ~ ~' Revision~TSa(e: 03/06/07 <br />27 Revision No.: PR-02 <br />