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• d - 0.1 <br />t = 1.282 for woody habitats <br />1.645 for herbaceous habitats <br />Results <br />The results of the cover survey indicate more vegetation cover on_the bottomland <br />vegetation type than the _pi_nyon-jun.i.per vegetation type. The bottomland <br />vegetation type is dominated by forbs with 77 percent of the total vegetation <br />cover. Grasses, shrubs and trees follow with 12, 10 and 1 percent, respectively, <br />of the total vegetation cover (Table 2). The most prominent species is common <br />horehound (Marrubium vulgare), a species known for invading waste places. Trees_ <br />~..- <br />dominate the vegetation of the pinyon-juniper vegetation type with 54 percent of <br />~--_ <br />the total vegetation cover. S ruh bs, grasses and forbs follow with 18, 17 and <br />12 percent, respectively, of the total vegetation cover (Table 2). The <br />predominant species Gambel oak (Quercus gambellii). <br />• The production study indicates that the bottomland vegetation type produces almost <br />four times (118.91 g/m2) the vegetation that the pinyon-juniper type produces <br />(30.11 g/m2) (Table 3). Comparisons, however, are misleading because trees cover <br />most of the pinyon-juniper type and were not sampled for production. Forbs were <br />far more productive in the bottomland vegetation type than any other classification <br />with shrubs next in importance. Shrubs were the most productive classification <br />measured in the pinyon-juniper vegetation type with grasses and forbs much less <br />-produuctive. ~.^-~--~ <br />Tree and shrub density and frequency data for the pinyon-juniper vegetation type <br />are presented in Table 4. Gambel oak is the dominant tree in terms of both <br />frequency and density. Pinyon pine and juniper are widely scattered on most areas <br />of the site. The dominant shrubs are snakeweed and mountain mahogany. Mountain <br />mahogany occurs in dense clumps in some parts of the site. T <br />Tree and shrub density and frequency data for the bottomland vegetation type are <br />. presented in Table 5. snakeweed is the dominant shrub in terms of both frequency <br />and density. Other trees and shrubs are minor constiuents of the bottomland <br />vegetation. <br />223 <br />