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84 <br />vegetation failed to become established on the shale-to-surface panel. <br />• Analysis of the data on a species basis for all vegetative parameters is <br />currently being done. <br />Effect of Seed Mixtures on the Density of Grasses, Forbs, and Shrubs <br />The total density of seeded and invading plant species showed a <br />varying response to the different seed mixtures. The introduced seed <br />mixture responded with a significantly higher (P=.0325) density of plants <br />than the native seed mixture. Total density of the introduced seed mix- <br />ture was also greater than the combination seed mixture, but this differ- <br />ence was not significant at the .05 level. This greater density response <br />from the introduced seed mixture may be the result of two factors. One, <br />the introduced plant species are generally more aggressive and establish <br />themselves better than native plant species. Two, the introduced seed <br />• mixture allowed a greater number of invading species to become <br />established. <br />Total Density of Invading Species. Examination of the total density <br />of invading species showed a significant interaction {P=.0265) between <br />seed mixture and soil-shale profile (Figure 27). Panels 2 and 4 appeared <br />to have a greater density of invading species. The greater density of <br />invasion on Panel 4 may be the result of an indigenous seed source which <br />was not present on the other panels. The greater density of invading <br />species on Panel 2 may be, in part, explained by the lower amount of <br />total biomass of seeded species observed on this panel. It is believed <br />that the lower biomass of seeded species on Panel 2 left more open spaces <br />available to the opportunistic invading plant species. It should be <br /> <br />