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A "vulnerable" plant species list for Colorado was obtained from the PTN <br />System. Plants listed as vulnerable are species that local taxonomists <br />think should be monitored for possible decrease in range or number. None <br />of the 33 "vulnerable" plant species of Colorado was encountered in the <br />study area. <br />SFIl2UB INCORPORATIO~iI AREAS (See Appendix A, Map 2) <br />Stands of shrubs that can be incorporated directly into the topsoil <br />without any selective vegetation removal are defined as those containing <br />no shrubs larger than 5 ft (152.4 cm) in height and 1~, inches (3.8 csn) <br />in diameter (or a basal area of 11.3 cm2). Transacts were surveyed in <br />upland sagebrush, mixed brush and aspen types to evaluate potential <br />areas of shrub incorporation and to help define what species vegetation <br />removal methods might be recniired in areas of large shrub growth or <br />tree stands. These data on shrub height and basal area are presented <br />by species, transact and vegetation type in Appendix B, Part 1 and <br />summarized in Table 4. Size (height) class distribution of shrubs in <br />upland sagebrush, mixed brush and aspen are graphically displayed in <br />Figures 1-3. <br />Average shrub height in upland sagebrush vegetation was 50.7 cm; maximum <br />height recorded was 101.6 cm. Although basal area of many of the shrubs <br />sampled was greater than the maximum for shrub incorporation (mean = <br />17.2 cm2), the laa height of the stand makes the entire upland sagebrush <br />vegetation co~Rmnuty an excellent candidate for shrub incorporation. <br />The areal extent of the stand within the study area is approximately <br />358 acres and is shown on Map 2, Appendix A. <br />In the mixed brush stand, Gambol oak and serviceberxy average shrub <br />height exceeded the maximum for shrub incorporation and sorre individuals <br />of sagebrush and chokecherry were greater than 152.4 cm in height. All <br />species except snowberry were represented by sor,~e individuals with a <br />basal area greater than the maxinaua and the average basal area for <br />sagebrush, Gambol oak and serviceberry exceeded the maximum. As a <br />• result, sagebrush, chokecherry, Cx~mbel oak and servioeJ~erxy would not <br />-28- <br />