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2 . 05 . 4 ( 2 ) ( e ) <br /> Sample adequacy requirements for cover data is <br /> calculated using the formula; <br /> nmin = ( s2t2 ) /(dx) 2 <br /> where nmin = the minimum adequate number of cover transects <br /> s2 = sample variance (absolute cover) <br /> t = a designated t-statistic ( two-tailed test with <br /> 90 percent confidence) <br /> d = desired limits of detection (0. 1 or 10 percent ) <br /> x = sample mean (absolute percent cover) <br /> Collection and Analysis of Woody Pant Density <br /> Data on shrubs is recorded at the randomly located <br /> vegetation cover sample sites. Shrub densities are tallied from <br /> a 50 meter by 1 meter quadrat constructed along the axis of the <br /> cover transect . The number of shrubs within the quadrat is <br /> determined by species . Individual stems are counted for all <br /> shrubs . <br /> Sample adequacy for woody plant density is calcu- <br /> lated using the formula as presented above ( for cover ) except <br /> that mean density and variance were substituted for mean cover <br /> and variance. <br /> Collection and Analysis of Production Data <br /> Rectangular plots 1 meter by 1 meter are used for <br /> production estimates . The current year' s growth of all herba- <br /> ceous plants is clipped. Herbaceous vegetation is sorted into <br /> the following categories ; annual grasses , perennial grasses , <br /> annual forbs and perennial forbs. Each production plot ,yields <br /> one sample. <br /> In the laboratory, clippings are oven-dried at <br /> 1050C for 24 hours and is weighed to the nearest tenth of a gram. <br /> Data are recorded as grams per square meter (g/m2 ) . The produc- <br /> tion estimates are also converted to pounds per acre ( lbs/Ac ) . <br /> Statistical adequacy requirements for production <br /> are calculated using the formula in section 2 . 9 . 1 , except that <br /> mean production and variance were used in place of mean cover and <br /> variance. <br /> •' 2. 05-27 July 1991 <br />