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CHIMNEY ROCK VEGETATION STUDY, 1987 <br />t2s2 <br />Nmin > <br />(dx)2 <br /> <br />1 <br />INTRODUCTION <br />On September 16 and 17, 1987 a vegetation study xas conducted at the Chimney <br />Rock Hine to determine the affect of grazing by cattle on the reclaimed area. <br />In order to determine what affect <br />herbaceous cover transacts xere read <br />reference areas. <br />grazing had on the reclaimed area, <br />on both the reclaimed and Mixed Shrub <br />HETHODS <br />All sampling sites were picked at random. Statistical parameters and <br />equations were the same as those used during baseline data collection. The <br />desired confidence level for adequate statistical interpretation is 80 <br />percent (d=.tx). To estimate sample adequacy a minimum oP 15 transacts were <br />sampled to obtain a preliminary adequacy valve using the Following formula: <br />Nhere: Nmin = minimum number of samples <br />s =sample standard deviation <br />t = t statistic (1.282) <br />d =amount of reduction to detect (0. 1) <br />x =sample mean <br />If necessary additional samples were taken until adequacy was met or a <br />minimum oP 50 transacts xere taken. <br />Percentage cover of vegetation (identified by species, rock, litter, and <br />Dare ground) was determined during sampling by using a randomly selected <br />50-meter line transact. At 1-m intervals xith the line, the first hit along <br />a line pro,)ected downward perpendicular to the transact was recorded and <br />placed in oae of the previously mentioned categories. Only the first <br />intercepted plant part xas recorded. <br />In addition shrub density was estimated on the reclaimed area using a 1 x 50 <br />meter belt transact. <br />1 <br />