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z.s.z wroo7 <br />WP007 is comprised of 7.9 acres of moderately sbping revegetation that has a predominately <br />northwesterly aspect. This unit was seeded in 1999 and therefore, has undergone four growing seasons <br />prior to sampling in 2003. A total of 45 plant taxa, including both mush and Canada thistle were <br />observed in the unit (see Table 19). <br />Ground cover (Fgure 10) consisted of 50.5% live vegetation, 2.2% rock, 1.2% standing dead, <br />22.3% litter, and bare soil exposure of 23.9%. Perennial cover across the unit averaged 26.1% with <br />annual and biennial cover averaging 24.3%. The dominant taxa were Russian thistle, prairie pepperweed <br />(Lepidium densiflorum), cheatgrass, field pennycress, slender wheatgrass, and Siberian wheatgrass wfth <br />6.1%, 5.7%, 5.4%, 4.9%, 4.2% and 4.2% average cover, respectively. Woody plant density was <br />determined from 15 belt transacts. Density (Table 2) totaled 429 young and mature stems per acre with <br />fourwing saltbush and big sagebrush the dominant woody plants. With regard to diversity, WP007 <br />exhibited 5 perennial grasses and 0 perennial forts with between 3ok and 50% relative cover. <br />Unit WP007 currently does not pass the bond release diversity standard of 3 perennial grasses and i <br />• perennial fort with between 3% and SO% relative cover (the fort component is missing). This unit <br />should readily pass production bond release comparison to the reference areas, and most likely will pass <br />ground cover comparisons. This unit does not presently meet the woody plant standard of 90% of 1000 <br />stems per acre, but could possibly meet this standard in the future given some additional natural <br />rewitrnent. See Appendix AA -Section 7.4 for a discussion on options and recommendations wdh <br />regard to woody plant density. As indicated, noxious weeds are readily observable within this unit and <br />include both Canada and musk thistle. In addition, bull thistle (Cirsium vu/gare) was noted and should be <br />treated with herbicide at the same time as the other two thistles. Although annual bromes currently <br />represent onty 7% cover, these populations should be visually monitored to gauge if they are expanding <br />or shrinking. If monitoring indicates that they are expanding, use of the herbicide Oust or Plateau is <br />recommended, and if necessary followed by spot reseeding. <br />• <br />Kemacon ere~gy ro. r Cdowyo uGrre Page 38 RevegetaUOn MoMtorl~ -2003 <br />