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Point-'iYee Distances (ft) <br />Transect Point * <br />Species ~ Q-1 Q-2 Q-3 Q-4 <br />~~ 1 Aspen 1 5.1 22.4 3.5 8.2 <br />2 12.2 10.6 6.9 10.0 <br />3 13.1 11.2 12.2 0.2 <br />4 1.5 3.8 21.5 6.1 <br />5 6.0 5.6 13.6 2.3 <br />6 4.2 7.9 1.4 5.6 <br />7 28.0 2.1 23.5 13.4 <br />8 12.0 12.5 6.9 14.2 <br />9 2.6 12.5 4.2 19.2 <br />10 2.5 20.1 3.8 12.1 <br />7bta1 distance (sum of above values) = 385.0 ft <br />Number of distances = 40 <br />Mean distance = 385.0/40 = 9.625 ft <br />Mean area per tree = (9.625)2 = 92.64 ft2 <br />No. of trees per acre = 43560/92.64 = 470 <br />* Quadrat <br />The Shannon-Weiner species diversity index may be used to compare community <br />composition data from a variety of sources. Differences in diversity <br />may be expected for caimimities at different stages of succession, in <br />different habitats, or at different times of the year. For example, <br />diversity indices calculated for vegetation data gathered at the <br />beginning of or mid-way through the gracing season would likely be laver <br />than those calculated at the end of the gracing season. These differences <br />would result primarily from the varying anthesis dates of vegetative <br />species encountered in the grass-forb stratian. A sample taken after <br />the growing season would account for irnst or all of the species that <br />had blooired during that gracing season, whereas earlier samples would <br />likely miss those species having late gracing season anthesis dates. <br />Thus, the later in the season vegetative data supporting diversity <br />indices are gathered, the more accurate those indices will be in <br />•~ reflecting the true vegetative species diversity. <br />-16- <br />