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the plot sizes used during baseline sampling. If the dryland pasture Ls <br />_= hayed by the landowner, productivity estimates for that type will be <br />obtained from him in the form of tons of hay per acre. iloody plant density <br />will be sampled by counting the number of stems growing within a lm x SOm <br />belt transect located at each cover iraasect. Species diversity eva- <br />luations will be based on composition of the vegetation cover, produc- <br />tivity, or frequency. <br />Sample site loeatione Will be randomly selected on the reclaimed sites <br />and associated reference areas through the use of a grid system and random <br />numbers table as vas used during the baseline study.. A minimum of 15 <br />samples will be taken for each parameter on each reclaimed site and <br />reference area to be sampled, then sample adequacy will be calculated using <br />the formula: <br />Nmin ~ TT <br />D <br />iJhere Nmin ~ The minimum number of observations needed <br />T ~ 1.28 for the 80X of confidence level <br />S2 - Variance of initial sample <br />D ~ .lz [sample mean (~ times level of accuracy <br />(+ lOX)J <br />Sampling will continue until the required number of samples to meet <br />adequacy has been taken, up to a maximum of 60 samples. <br />Suttees of revegetation relative to vegetation cover and productivity <br />will- be documented Dy comparing the cover and productivity of reclaimed <br />sites with the equivalent parameters from the associated reference areas <br />after the appropriate weighting. Heighting is achieved by multiplying [he <br />parameter estimate (e. g., cover) by the proportion of [he revegetated area <br />the type represents then summing the values for a1T-types represented. <br />Weighting formulae are: <br />Fah xh <br />z„t ~ -~- <br />38-36 <br />