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*in the cumulative presence data from 2m x 50m samples associated with the collection of a <br />statistically adequate sample of the reclaimed area and including alfalfa and /or cicer milkvetch, which <br />have often been included in seed mixes as nitrogen— fixers, due to the lack of suitable and available native <br />nitrogen- fixers. <br />If the total cumulative number of native species in the reclamation sampling exceeds the average number <br />of native species per 100 sq.m. in the weighted average of the reference area sampling, then Test D is <br />passed. <br />Woody Plant Density Evaluation <br />The location of woody plant concentration areas in BRB PSCM -1 were documented by field mapping and <br />assisted by aerial photography (Routt County DOQQ 2009) in the Summer of 2010. During the mapping, <br />"High" density was reserved for those areas apparently (visually) greater than or equal to 2000 shrubs per <br />ac (one quarter shrub per sq.m.; 25 shrubs per 100 sq.m.). <br />Quantitative density data from fifty randomly located samples within the mapped woody plant <br />concentration areas were gathered from belt transects located and oriented randomly. In the Background <br />woody plant density portions of BRB PSCM -1, thirty sample points, in conjunction with cover and /or <br />production, were located and sampled for woody plant density. The belt transects (i.e. elongate sample <br />plots) were 2 m x 50 m in dimension and randomly oriented from the origin. Within each belt transect, all <br />living trees and full shrubs whose root crowns emerge within the plot boundaries were counted by <br />species. Sample adequacy of the collected woody plant density data from the BRB PSCM -1 was <br />determined as follows: <br />where: <br />nmin <br />(st) <br />(dx) <br />n min = the number of sample points needed in a given vegetation type to be capable of detecting a 15% <br />reduction in the mean with 90% confidence; <br />s = standard deviation (n -1); <br />10 <br />