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1 r 1 1 1 1 1 r 1 1 1 1 Table 6. (Cont'd) TRENDS IN MEAN COVER FOR THE RECLAIMED AREA AT THE WALDEN COAL PROJECT SITE. BASED ON DATA COLLECTED BETWEEN 1989 AND 1994. MEAN COVER VALUES IN PERCENT. Year Species 1989 1990 1991 1992 1993 1994 Erysimum asperum 0. 00 0. 01 0.00 0.00 0.00 0.00 Penstemon stri ctus 0. 00 0. 01 0.01 0. 01 0.01 0.01 Rumex salicifolius 0. 00 0. 00 0.01 0. 00 0.01 0.01 Subtotal 0. 10 0. 19 0.09 0. 02 0.05 0.09 ANNUAL AND BIENNIAL FORBS Carduus nutans 0. 00 0. 00 0.01 0. 00 0.00 0.00 Chenopodi um atrovirens 1. 10 0. 01 0.01 0. 00 0.00 0.00 Chenopodi um berlandieri 3. 10 1. 80 0.00 0. 00 0.00 0.00 Chenopodi um pra teri cola 0. 00 0. 01 0.00 0. 00 0.00 0.00 Cordylanth us wri gh tii 0. 00 0. 00 0.00 0. 00 0.00 0.01 Descurainia ri cha rdsonii 0. 00 0. 01 0.00 0. 01 0.00 0.00 Kochia scoparia 0. 00 0. 01 0.00 0. 00 0.00 0.00 Ma chaeranthera canescens 0. 00 0. 00 0.00 0. 01 0.01 0.01 Salsola kali 0. 40 0. 50 0.30 0. 00 0.00 0.00 Sisym6rium altissimum 0. 00 0. 01 0.00 0. 01 0.00 0.00 Solanum triflorum 0. 00 0. 00 0.00 0. 01 0.00 0.00 Subtotal 4. 60 2. 35 0.32 0. 09 0.01 0.02 SEMI-SHRUBS OR HALF-SHRUBS Artemisia frigi da 0. 00 0. 01 0.10 0. 01 0.10 0.01 Subtotal 0. 00 0. 01 0.10 0. 01 0.10 0.01 SHRUBS Artemisia triden to to 1. 90 2. 80 3.60 9. 00 2.60 6.40 Cera toi des Lana to 0 .00 0. 01 0.01 0. 01 0.10 0.01 Chrysothamnus nauseosus 0 .00 0. 00 0.01 0. 01 0.01 0.01 Chrysothamnus vi scidi florus 0 .00 0. 00 0.00 0. 00 0.00 0.01 Purshia triden to to 0 .00 0 .00 0.00 0. 01 0.00 0.00 Sarcoba tus vermiculatus 0 .00 0. 00 0.00 0 .01 0.01 0.01 Subtotal 1 .40 2 .81 3.62 4 .09 2.72 6.49 LITTER 59 .00 37 .30 99.90 40 .20 44.50 48.50 ROCK 0 .20 0 .00 0.20 0 .00 0.00 0.10 TOTAL VEGETATION 18 .40 30 .80 18.60 29 .50 30.30 28.50 LITTER/ROCK 59 .20 37 .30 50.10 90 .20 49.50 98.60 BARE SOIL 27 .40 31 .90 31.30 30 .30 25.20 22.90 TOTAL COVER 72 .60 68 .10 68.70 69 .70 74.80 77.10 No. Species/Sample 3.35 4.35 3.15 3.50 3.30 3.50 -17-