Revegetation of an Alpine Mine Disturbance

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Excerpt from Revegetation of an Alpine Mine Disturbance: Beartooth Plateau, MontanaThe purpose of this Research Note is to show the relationship between sample size (number of plots) and precision of measuring production on 12 mountain grassland and shrubland habitat types2 common to western Montana. This information should help the range manager obtain a more realistic view of the validity of his production determinations on these and similar habitat types.Information presented in table 1 was developed from data obtained during a study to determine forage productivity and variability on important habitat types. Ten of the 12 habitat types are represented by three stands selected to span the range in productivity potential for the respective habitat type, the remaining two habitat types are represented by only two stands in each. A sampling technique combining estimation (40 plots) and clipping (10 plots) was used to determine production. The 10 clipped - ft2 circular plots were randomly distributed within each stand. These clipped plots provided an estimate of the coefficient of variation (cv) by vegetation classes and species in each stand. The CV in turn forms the basis for determining the number of plots required to achieve given levels of sampling precision.The formula used to compute the number of plots (n) needed for the specified levels of sampling accuracy (freese 1967) shown in table 1 is.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully, any imperfections that remain are intentionally left to preserve the state of such historical works.