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1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />Table 7. PRODUCTION SUMMARY FOR THE GRASSLAND REFERENCE AREA AT THE <br />WALDEN COAL PROJECT SITE. BASED ON 1998 DATA FROM 15 ONE SQUARE <br />METER QUADRATS. t VALUES EQUAL STANDARD DEVIATION. <br /> <br />Species Mean <br /> <br />g/sq.m <br /> <br />Ibs/Acre Range of <br />Production <br />Values <br />(g/sq.m) Percent of <br />Total <br />Production <br />COOL SEASON PERENNIAL GRASSES <br />Agropyron dasystachyum 14.26 127 6.35 - 25.63 46.86 <br />Calamagrostis montanensis 1.17 10 0.00 - 6.02 3.85 <br />Carex eleocharis 0.98 9 0.00 - 6.79 3.22 <br />Carex filifolia 0.01 <1 0.00 - 0.08 0.02 <br />Koeleria macrantha 2.90 26 0.00 - 10.72 9.54 <br />Oryzopsis hymenoides 0.11 1 0.00 - 1.68 0.37 <br />Poa sand6ergii 0.24 2 0.00 - 1.70 0.80 <br />Stipa comata 5.96 53 0.00 - 13.89 19.58 <br />Sub-total 25.63 228 84.23 <br />WARM SEASON PERENNIAL GRASSES <br />Bouteloua gracilis 0.1 1 0.00 - 0.94 0.32 <br />PERENNIAL FORBS <br />Erigonum sp. 0.37 3 0.00 - 1.32 1.20 <br />Other Perennial Fortis 1.72 15 0.00 - 7.17 5.65 <br />Sub-total 2.09 19 6.85 <br />SEMI-SHRUBS OR HALF-SHRUBS <br />Artemisia frigida 2.62 23 0.00 - 6.30 8.60 <br />TOTAL PRODUCTION 30.43 271 <br />t 4.93 ± 44 <br />-23- <br />