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1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />LIFE FORM CATEGORY <br />Perennial grasses <br />Annual grasses <br />Perennial forbs <br />Annual, biennial forbs <br />Shrubs <br />Noxious weeds <br />Perennial, non-noxious veg <br />RELATIVE PERCENTAGE <br />1991 1992 <br />12.8 19.0 <br />0.5 2.7 <br />0.5 3.8 <br />40.5 24.3 <br />41.0 50.2 <br />4.6 --- <br />54.4 73.0 <br />The table above indicates that the relative <br />contributions by different life forms have shifted. <br />Perennial life forms (grasses, forbs, shrubs) all increased <br />in their relative cover contribution while annual forbs <br />decreased markedly. This is consistent with qualitative <br />observations made regarding the two years. In 1991, the <br />mine was noticeably dominated by short shrubs (predominantly <br />Atriplex canescens - Four winged saltbush) and annual forbs. <br />Perennial grasses were dwarfed, dry, and almost wholly <br />isolated to drill rows which were still evident. In 1992, <br />annual forbs dominated in fewer areas than the previous year <br />and had been entirely excluded in many parts of the mine <br />surface, especially at the topographically lower locations. <br />Shrubs were much larger, in some places impeding easy <br />movement (see the bottom picture on page A-7). Perennial <br />grasses were also much more numerous and appeared well <br />5 <br />