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-30- <br />• The forb stratum evidenced the highest production 569.3 1bs/acre or 69.88 <br />of the total production; grasses contributed 245.8 lbs/acre production <br />(30.2$). Most of the identifiable forbs in production samples were weed <br />species including field bindweed, buckhorn plantain, Russian knapweed <br />(Centaurea repens) and romron bluemustard. As with other rover samples, <br />wheatgrass anti brome species were well represented in production sar~les. <br />Total percent moisture in production samples collected was 32.9% for <br />forbs and 36.48 for grasses. <br />The grassland reference area vas situated on a 2.2 acre site not to be dis- <br />turbed by future mining activities (Map entitled "Vegetation Types", Appen- <br />dix A). Only 10 species were encountered in cover quadrats and as a result, <br />the species diversity ittdex was low, 1.45. <br />Total Dover (vegetation plus bare ground plus litter-rock) for the grass- <br />land reference area was estimated at 75.38. Of this total, vegetation <br />. basal rover accounted for 14.98 while litter-rock and bare ground crnq~rised <br />20.68 and 39.88 of the total rover, respectively. 'lbtal grass and forb <br />basal cover on the site comprised 59.78 and 30.98 of the total vegetation <br />Dover, respectively. However, the grass cover was contributed by one <br />species, sand dropseed (Sporobolus cryptandrus). Stickseed (Iappula texana) <br />and scarlet globemallow (Sphaeralcea coccinea) were coRemn forbs in rover <br />quadrats accounting for 41.3 and 21.7% of the total forb cover, respectively. <br />Frequency values for these two species were 68.38 and 40.08, respectively. <br />Broom snakeweed (a sub-shrub). Basin big sagebrush (Artenisia tridentata) <br />and four wing saltbush (Atriplex canescens) contributed m;n;mally to total <br />vegetation cover. <br />Total production on the grassland reference area was 682.6 1bs/acre. The <br />majority of the production was contributed by forbs which accounted for <br />548.1 lbs/acre or 80.38 of the total production. Tumbling hedgemustard <br />(Sisymbrium altissimim) accounted for 59.58 of the total forb production. <br />Broom snakeweed (66.4 lbs/acre) and rubber rabbitbrush (Chrysothamnus <br />• nausesus), (40.6 lbs/acre), were the next mast productive vegetative spe- <br />cies. Unidentified annual forbs rontributed 150.9 lbs/acre total dry <br />weight production. Pert?nt ;miatur? crntent vras 46.28 for grasses and <br />31.78 for forbs. <br /> <br />