Laserfiche WebLink
Lifef°rm <br />Species Density <br />RRR~ SR Ave <br />Annual! Biennial Forbs 6.2 3.2 <br />Annual Grasses 0.5 0.0 <br />Perennial Forbs 6.4 14.7 <br />Perennial Cool Season Grasses 3.8 8.2 <br />L- J <br /> <br />IsmoSB = ((3.2+0.0+6.4+3.8)'2)/ (6.2+3.2+0.5+0.0+6.4+14.7+3.8+8.2) = 64.6% <br />The weighted average for the overall similarity of the reference area lifeform species <br />density to BRB-2 lifeform species density was as follows: <br />67.3%'0.83 + 64.6%*0.17 = 66.8% <br />Since this value is greater than 90°/a of the standard (0.9 x 70°/a = 63°/a), Alternative <br />Test C is passed for BRB-2. <br />Regarding Alternative Test D, the total number of native species encountered in the <br />twenty 100'sq. m. (2m x 50 m) samples of BRB-2 was 39, greater than the average <br />native species density of either the Mountain Brush Reference area (29.6 species per <br />100 sq.m.) or the Sagebrush/Snowberry Reference Area (27.9 species per 100 sq.m.) <br />Hence Alternative Test D is passed for BRB-2. <br />Since the Mandatory Test A as well as two of the three other tests were passed for <br />species diversity, the species diversity test based on Phase III criteria is passed as <br />a whole by BRB-2. <br />WOODY PLANT DENSITY <br />Although lands subject to Interim Program rules have no woody plant requirements at <br />all, it is interesting to note that the background level observed (over 800 stems per acre) <br />is well above the Permanent Program standard of 100 stems per acre. The areas of <br />shrub concentration that lie within BRB-2 and that were mapped by the same criteria as <br />those in BRB-3, where in 2006 an average of nearly 2900 stems per acre were observed <br />(see below), comprised over 35% of the entire area of BRB-2. <br />22 <br />