Laserfiche WebLink
Quantitative density data from the randomly located samples in 2015 within the fenced woody plant <br />density concentration areas were gathered from belt transects located and oriented randomly. In the <br />"background" woody plant density portions of BRB-3, sample points were located and sampled for woody <br />plant density in conjunction with cover and/or production. Additional sampling of "volunteer" woody plant <br />density areas was not conducted in 2015. The belt transects (i.e. elongate sample plots) were 2 m x 50 <br />m in dimension and randomly oriented from the origin. Within each belt transect, all living trees and full <br />shrubs whose root crowns emerge within the plot boundaries were counted by species. Sample <br />adequacy of the collected woody plant density data from the BRB-3 was determined as follows: <br />(SO2 <br />n m L n = (dx)2 <br />Where: <br />nmi„ = the number of sample points needed in a given vegetation <br />type to be capable of detecting a 15% reduction in the mean with <br />90% confidence; <br />s = standard deviation (n-1); <br />t = the t statistic (one -tailed, 90% confidence; n-1 degrees of <br />freedom; if n>30, t = 1.282 for purposes of this study); <br />d = acceptable amount of inherent variability to be identified <br />between the sample mean and the true population mean (0.15 for <br />purposes of this analysis); <br />x = sample mean for woody plant density data. <br />Phase III Revegetation success for woody plant density will be demonstrated by one of the statistical <br />approaches used to asses cover and production (see above), or a non -parametric rank -order "U test <br />(minimum of 30 samples, technical standards not subject to adequacy) is set forth in CDRMS/CDMG <br />2005 revised rule, 4.15.11 (3)(a), shown as follows: <br />L = p(n+1) — Z [np (1-p)] "0.5 <br />Where: <br />L = order statistic corresponding to the one sided lower 80% <br />confidence limit <br />p = 0.5 (e.g. the 0.5 quantile, or median) <br />n = sample size <br />13 <br />