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r 3. Point-Centered Quarter Density Sampling for Shrubs and Trees <br />^,~ For each point: <br />_ ai = ~ (yi12 + yi22 + yi32 + yi42) <br />r <br />~: where <br />Yi = distance from point to center of nearest shrub or tree in the <br />it ith quadrant <br />I_ <br />~. n = 3.1416 <br />__ Di = 3 <br />r ai <br />I EDi <br />~ = n <br />- where <br />-~ Di = density for a point <br />6 = density for a vegetation type <br />n = number of points sampled <br />4. Determining Species Diversity Indices <br />- C <br />d = N (F 1og10 F - Efi 1og10 fi) <br />L. <br />where <br />-- c = 3.341928 (converts base 10 log to base 2) <br />N = number of individual species <br />F = total foliage cover in vegetation type <br />fi = cover of each species <br />_ d = species diversity for vegetation type <br /> <br />