2001-12-11_PERMIT FILE - C1981012A (6)

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z7 • '~ Biomass data collected in the 1979 growing season is not consistent with the cover data and other characterizers of the vegetation. It is believed that the sample size for biomass data collection must be increased in order to minimize the variance encountered in the treatments sampled. Species Evaluation Plot The purpose of this plot is to identify the best grasses, fortis, and shrubs adapted to the waste material at this site. Many species not appearing in the `fain Plot seed mixture are seeded here to permit the investigation of a wider selection of plant materials. Because of the nature of the plot, the plants are subject-only to intraspecific competi- tion for moisture and nutrients. Intraspecific competition is often • ~ more severe than interspecific competition, because plants of the same species seeded together have very similar moisture and nutrition require- ments. A complete test of a species' success will require the interspeci- fic competition of growing in a mixture of species. Table S contains the species rated goad to excellent in vigor and survival. Slope Plots The most obvious difference between the two sets of slope plots was the lack of vege*_ation on the steeper 1.5:1 plat. The 3:1 plots support a much mare vigorous growth of seeded species. Examination of the steeper 1.5:1 slope plot has shown that the absence of vegetation appears to be the result of erosion beneath the mulching materials and also the higher heat load the steeper slope accumulates. The slack material beneath the . ~ mulch is extremely erodible when placed at a grade this acute. The 1.5:1