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• <br />u <br />pounds/acre) followed by annual grass at 10.2 g/mZ (91 pounds/acre). While the contribution <br />of perennial grasses and (orbs was (2.2 and 6.8 g/m2, respectively). In order to sample the <br />perennial species at the peak of their production, many of the earlier maturing annual species <br />were senescent or were already gone from the stand. Thus the annual grass production is <br />likely higher than stated. <br />Woody plant density measurements in 1999 differed from 1987 as suffruticose species were <br />not measured consistent with Guidelines for Compliance with Land Use and Vegetation <br />Requirements for Coal Mining. Succulents were also not included in the density calculations. <br />Mean density for the type was 37.7 stems/50m2 or 3,015 stems/acre (Table 2.04.10-26). <br />Sagebrush dominated <br />TABLE 2.04.10-24 <br />MEAN COVER (PERCENT) AND FREQUENCY VALUES FOR THE SAGEBRUSH - 2 <br />VEGETATION PERMIT EXPANSION STUDY AREA, 1999 <br />SPECIES MEAN PERCENT COVER (N=55) FREQUENCY <br />Annual Grasses <br />Anisantha tectorum 6.5 44 <br />Total Annual Grasses 6.5 <br />Perennial Grasses <br />Agropyron smithii 0.5 04 <br />Bouteloua gracilis 0.2 02 <br />Bromopsis inermis ssp. inermis 0.5 02 <br />Poa pratensis 0.2 02 <br />Sitanion longifolium 0_2 13 <br />Total Perennial Grasses 1.6 •- <br />Annual/Biennial Forbs <br />Descurainia richardsonii ssp. incisa <0.1 02 <br />Grindelia squarosa 0_7 04 <br />Total Annual/Biennal Forbs 0.7 -- <br />Perennial Forbs <br />Artemisia ludoviciana 0.7 05 <br />Cirsium Arvense 0.5 05 <br />Centaurea repens 0.2 10 <br />Sonaeralcea coccinea 0.2 02 <br />• (REVISED 9/99) 2.04.10 - 76 <br />