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Table 6. TRENDS IN MEAN COVER FOR THE COMBINED RECLAIMED AREAS AT THE WALDEN COAL PROJECT SITE. BASED ON DATA COLLECTED BETWEEN 1989 AND 1996. MEAN COVER VALUES IN PERCENT. 1 r I Species 1989 1990 1991 1992 1993 1999 1995 1996 Sample Size 20 20 20 20 20 20 20 20 COOL SEASON PERENNIAL GRASSES Agropyron da systa chyum 7.40 15,20 8.70 15.90 17.40 10.50 6.90 8.40 Agrostis scabra 0.00 0,01 0.00 0.00 0.00 0.00 0.00 0.00 Agropyron smithii 1.90 2.70 1.10 0.40 0.90 0.90 0.01 0.30 Agropyron Spica rum 0.00 0,01 0.01 0.01 0.01 0.01 0.00 0.00 Agropyron tra chyca ul um 0.00 0.00 0.00 0.10 0.00 0.00 0.00 0.00 Cera tochl oa ma rgi na to 0.00 0,00 0.00 0.00 0.00 0.01 0.00 0.00 Deschampsia ca espitosa 0.00 0.01 0.00 0.00 0.00 0.00 0.00 0.00 Festuca idahoensis 0.00 0,00 0.00 0.00 0.80 0.00 0.00 0.10 Xotdeum bra chyantherum 0.00 0.10 0.00 0.00 0.00 0.00 0.00 0.00 Hozdeum jubatum 0.00 0.01 0.01 0.01 0.00 0.00 0.00 0.00 Koeleria macrantha 0.00 0.00 0.00 0.00 0.01 0.00 0.00 0.01 Oryzopsis hymenoides 0.00 0.01 0.01 0.01 0.01 0.10 0.01 0.01 Poa ampla 0.70 0,00 0.00 0.00 0.10 0.01 0.00 0.00 Poa secunda 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.10 Stipa Columbiana D.00 0.00 0.00 0.00 0.00 0.00 0.01 0.00 Stipa coma to 0.00 0.00 0.00 0.10 0.00 0.00 0.00 0.00 Stipa vi ridula 2.10 1.00 0.01 1.30 0.20 0.90 0.70 0.20 S ubtota2 12.10 19.05 9.84 17.33 19.93 11.93 7.63 9.10 INTRODUCED PERENNIAL GRASSES Agropyron crista tum 0.00 0.01 0.00 0.01 0.10 0.01 0.01 0.01 Agropyron intermedi um 0.00 0.00 0.00 0.10 0.01 0.20 0.01 0.00 Alopecutus pra tensis 0.00 2.10 0.01 0.90 0.70 0.50 0.60 0.10 Bromus inermis 0.00 0.00 0.00 0.01 0.00 0.00 0.01 0.01 El ymus junceus 0.20 2.90 2.80 7.20 6.95 6.90 15.80 10.90 Festuca ovina 0.00 1.50 2.00 0.01 0.30 2.60 0.40 0.50 Poa pra tensis 0.00 0.10 0.01 0.00 0.01 0.01 0.00 0.00 Subtotal 0.20 6.61 4.82 8.23 8.07 10.22 16.80 11.52 ANNUAL GRASSES Bromus tectorum 0.00 0.01 0.00 0.00 0.00 0.00 0.00 0.00