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Wesr E(k Mi~~e <br />Shrub cover, frequency, and density were obtained using the Lindsey line-strip method (Lindsey <br />1955). Cover by shrub species was measured along a 10-meter tape. Density measures for each <br />shrub species were obtained by counting the number of individuals within a 2m by lOm rectangular <br />quadrat. All individuals counted were also measured and separated on the basis of height class. <br />Height classes were defined as follows: the lowest class included individuals ranging from 0.25 m - <br />0.75 m; the second height class included individuals ranging from 0.76 - 1.25 m; the third height <br />class included individuals ranging from 1.26 - 1.75 m; the fourth height class included individual <br />ranging from 1.76 - 2.23 m; and the fifth height class included individuals greater than 2.25 m. This <br />pazameter gives an indication of the vertical distribution within and between the various species of <br />shrubs. Location of the line-strip-was random. The initial point of the.line-strip was the central <br />point of the randomly located circular herb cover quadrant. <br />Production estimates were obtained from randomly located 1.0 mZ circular quadrates. Current <br />year's growth for the clipped samples was sepazafed into grasses, forbs, semi-shrubs, and shrubs. <br />Forbs were further divided into perennials and annuals. Fresh weights were. determined for all <br />samples at the time of collection in order to evaluate sample size and sample adequacy. In the <br />laboratory, all samples were uniformly dried at 105 C for 24 hours. Oven-dried samples were <br />weighed to the nearest milligram. Mean production estimates were calculated for each species or <br />species group for each vegetation community. <br />Sample adequacy was determined at the time of sampling. The equation used for evaluating sample <br />adequacy is from the OSM gtiideline, A Statistical Evaluation of Revegetation Success on Coal <br />Lands in the West (Izrson 1980), and is as follows: <br />tz sZ <br />m= z <br />D <br />where: <br />m = the minimum number of observations needed <br />t = a table value (t distribution) for a given level of confidence <br />s2 = the variance estimate <br />D = the level of accuracy desired for the estimate of the mean <br />1982 Dry Meadow Vegetation Community Resamnlin¢ <br />After review the 1980 dry meadow data, the OMLR requested changes in the delineation of the dry <br />meadow reference area. The larger dry meadow reference area (Map 44) was then resampled in <br />1982. The dry meadow affected area was also resampled at the same time. Herbaceous cover, <br />shrub cover, shrub density, and production were all sampled using the same methods used in 1980. <br />Statistically adequate sample sizes were obtained for cover, production, and shrub density for all <br />four azeas sampled ('T'able 24). Sample adequacy calculations for the dry meadow community aze <br />based on the 1982 data. Calculations for the oakbrush community are based on the 1980 data. <br />2.04-146 - Rrvie'rd April2004 PRIO <br />