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<br />EXPLANATORY ADDENDUM <br />EXHIBIT J <br />VEGETATION <br />PIKEVIEW QUARRY 77-211 <br />G. Exhibit J - Vegetation <br />1) P-J-1 - Please state the percent density of the native <br />plant communities. <br />RESPONSE G1. Percent density is an ambiguous term without <br />much ecological meaning. Density is a measure of number of units <br />per unit area and cannot meaningfully be expressed directly as a <br />percentage. The estimated percent cover of the vegetation varies <br />considerably with the location. The shrub areas have an average <br />of 458 crown cover by shrubs and an average of 808 cover of the <br />ground story. Northslope forests have crown covers that vary from <br />308 to 758 and a ground story cover of about 408 due mostly to <br />shading, acid soil, and droughty soil conditions produced by root <br />competition. South facing slopes range from 158 to 208 up to <br />about 708 depending on the rock content of the soil and the slope. On <br />south facing slopes there is no appreciable shrub cover as the <br />shrubs and trees are scattered. <br />2) Since such diverse vegetation communities exist, this <br />information should be portrayed on a vegetation map. <br />RESPONSE G2. Vegetation communities as complex as these <br />cannot possibly be represented on a map which displays static, visually <br />or mathematically determined units. A map cannot display vegetation <br />dynamics. A map is supplied showing the principal visual units in <br />• Exhibit J1. <br />P-J-S* <br />