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appears to require more moistwe and a longer overall favorable Bowing season. Stipa <br />viridula, though a cool season grass, responds in the opposite manner of Calamovilfa, <br />• with highest relative cover values during normal and dry years. This season, the <br />precipitation amounts and distribution appeared optimal for Stipa viridula. Artemisia <br />filifolia continues to maintain a relatively constant presence in the reference area as shown <br />by the relative cover values. This species appears largely relatively unaffected by <br />precipitation, likely due to its woody habit. <br />4.5.2 1995 Reclamation Areas <br />The 1995 reclamation areas have been sampled quantitatively for the last six growing <br />seasons. A total of thirty-eight species have been enwuntered in vegetation sampling since <br />1998. Of those species, eight were present in each year of the sampling. These species <br />included five perennial cool season grasses, two perennial warm season grasses, and one <br />annual cool season grass. <br />No one species has shown consistem yearly increases in relative cover over the period of <br />sampling. However, several perennial species show stable contributions during the last <br />five Bowing seasons, including Agropyron cristatum, Agropyron dasystachyum, <br />Agropyron smithii, Bouteloua gracilrs, Calamovilfa longifolia, and Oryzopsis <br />hymenoides. The cool season gaminoids Agropyron cristatum and Agropyron <br />dasystachyum decreased in relative cover this season, while Bromus marginatus, <br />Oryzopsts hymenoides, and Agopyron smithii increased. Bouteloua gracilis increased m <br />• relative cover the first three years, decreased slightly in 2001, increased significantly in <br />2002, and decreased this year. Bromus tectorum relative cover increased significantly this <br />season, revealing its sensitivity to spring precipitation. No forts, succulents or woody <br />plants have been encountered consistently in this reclamation area. Ambrosia psilostachya <br />and Helianthus animus have been sampled in five of six years, but neither contributes <br />significantly consistently to relative cover. <br />4.5.31997 Reclamation Areas <br />Quantitative sampling has been undertaken in this area for the past five Bowing seasons. <br />During this time thirty-five species have been encountered. Of those species, six have <br />been present in all years. These species include one perennial wane season grass <br />(Calamovilfa longifolia), one perennial cool season grass (Oryzopsis hymenoides), one <br />annual grass (Bromus tectorum), one perennial native fort (Ambrosia psilostachya), one <br />native annual fort (Helianthus ammns), and one introduced annual fort (Kochia <br />scoparia). <br />In the 1997 reclamation areas this year, only the cool season annual Bass Bromus <br />tectorum and the warm season annual fort Helianthus animus increased significantly <br />(537% and 993% respectively) in relative cover. Warm season perennial grass <br />Calamovi/fa longifolta and cool season grass Oryzopsis hymenoides decreased slightly <br />(24% and 20%, respectively). Ambrosia psilostachya decreased 62 percent in 2003. <br />LJ <br />Coors Energy Company Page 22 <br />2008 Revegetation Monkoring Report <br />