2008-03-13_REPORT - C1981019 (2)

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• • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • r • • • Table 4 Colo o - Ve etation Cover - 2007 East Pit Revegetation -Average Cover Summary Area -> EP036 EP039 EP040 EP041 EP044 EP046 Growing Seas»ns--> 7 4 4 4 4 2 Grasses and Grass-likes gropyron a scans ri i s ea grass - - - I P Agropyron cristatum Crested Wheatgrass 0.85 - - - 0.13 - N P Agropyron dasystarh m Thickspike Wheatgrass 9.80 16.40 11.73 11.53 18.80 6.73 N P Agropyron npanum Streambank Wheatgrass 2.30 1.40 8.33 10.93 2.40 0.40 I P Agropyron sibericum Siberian Wheatgrass 7.35 2.40 0.67 0.20 - 0.87 N P Agropyronsmithii Western Wheatgrass 1.85 0.73 0.80 2.53 1.13 0.27 N P Agropyronspicatum Bluebunch Wheatgrass 1.30 0.27 4.27 4.87 2.60 - N P Agropyron spicatum inerme Beardless Bluebunch W. - - - 1.53 0.07 - N P Agropyron trachycau/um Slender Wheatgrass 0.25 1.20 9.67 7.60 2.80 2.60 I P Bromus inermis Smooth Brome 1.60 1.20 0.53 0.53 0.27 0.33 I A Bromusjaponicus Japanese Brome 3.85 - 9.07 4.20 9.20 - N P Bromus marginatus Mountain Brome 0.55 - 0.47 0.60 0.40 6.00 I A Bromus tectorom Cheatgrass 11.45 36.87 11.53 22.33 31.13 20.67 I P Dactylisglomerata Orchardgrass 2.00 - - - - - N P E/ymus dnereus Basin Wildrye 1.85 1.13 0.93 1.00 0.33 - I P E/ymusjunceus Russian Wildrye 1.60 0.53 0.93 - 0.53 0.20 N P FesYuCa ovina/saximontana Hard Fescue 0.10 - 0.40 - - - N P Oryzopsis hymenoides Indian Ricegrass - 0.40 - - - - I P Phleum pratense Timothy 0.15 - - - - - N P Poa amp/a Big Bluegrass - - - 0.60 - - I P Pha pratensis Kentucky Bluegrass 5.55 0.87 0.27 0.93 5.00 5.07 N P Poa sErvnda Sandberg Bluegrass - - 0.60 0.40 0.13 - N P Sibnion hyslrix Bottlebrush uineltail 0.25 0.13 0.20 0.40 - - Forbs i ea anuoisa Western arrow - - 0. 7 7 - 0. 7 13 0 i P A~ragalus aver Cicer Milkvetch 6.45 0.13 0.07 - . I A Chenopodium album Lambsquarter - - - - - 0.13 W P G7rslum arvense Canada Thistle 0.05 - - - - 1.60 W B Ciis/um vu/pare Bull Thistle - 0.13 - - - 0.13 N A Col%mia linearis Slenderleaf Collomia - - - 0.13 0.07 0.47 N A De/curainia pinnab Pinnate Tansymustard - - - 0.87 0.13 - N P Heliomeris multifiora Goldeneye 0.05 - - - - - I B La[tuca serrio/a Prickly Lettuce - 0.07 - 0.07 0.80 - N P Unum /ewisii Lewis Flax 0.65 0.07 0.07 0.40 0.13 0.13 I P Medicagosativa Alfalfa 1.60 - - 0.07 - - I P Onobrychis vidaefolia Sainfoin - - - - 0.33 N P Penstemon pa/mer/ Palmer Penstemon - - - 0.20 - - N P Penstemon sbictus Rocky Mtn. Penstemon 0.10 - - 0.07 - - I A Polygonum aviculare Prostrate Knotweed - - - - - 333 I A Sa/so/a ausba/is Russian Thistle - 0.07 - - - 5.40 I P Sanguiso/ba minor Small Burnet - - 0.13 0.27 0.13 0.40 I A Sisymbrium a/Ussimum Tumble Mustard - - 0.07 0.27 2.47 I A fi/asps arvense Field Pennycress - - - - 0.33 1.87 I B Tragopogon dubius False Salsify 0.25 - 0.07 0.07 - - Unidentifiable - 0.07 - - 0'27 Shrubs, Cacti 8<Trees emis~a Cana ver ge - - - - - N P Artemisia bidentata vas Mtn. Big Sagebrush 1.55 - - - - N P Abi lercanescens Four-win Saltbush 0.85 - - - - 0.20 Total Plant Cover 64.95 64.33 60.80 72.67 79.33 57.40 Rock 0.45 - 0.67 0.13 0.07 0.67 Litter 22.70 25.47 27.87 19.27 14.40 16.73 Bare round 11.90 10.20 10.67 7.93 6.20 25.20 Total Perennial Cover 49.35 27.13 40.07 44.73 34.93 23.80 Summa b Lifeform: Perennial Grasses 37.35 26.93 39.80 43.67 34.60 22.53 Annual Grasses 15.30 36.87 20.60 26.53 40.33 20.67 Perennial Forbs 9.40 ~ 0.20 0.27 1.07 0.33 1.07 Annual & Biennial Forbs 0.25 0.20 0.13 1.40 4.07 11.20 Noxious /Aggressive Weeds 0.05 0.13 - - - 1.73 Shrubs 2.60 - - - - 0.20 Sam le Ad uacy Calculations: Mean = 64.95 64.33 60.80 72.67 79.33 57.40 Variance = 182.155 121.810 43.314 53.238 42.524 187.400 n = 20 15 15 15 15 15 nmi„ = 7.61 5.32 2.12 1.82 1.22 10.29 Rio Tinto Energy America/Colowyo Mine Page 29 Revegetation Monitoring - 2007