The rating noxious weed infestation should be guided by local weed list of noxious weeds as provided by municipal weed control authorities. This question attempts to identify noxious (restricted weeds) infestation on a range site. In the analysis of plot data, three noxious weeds were encountered including Canada thistle, leafy spurge and tall buttercup. Several nuisance weeds were also encountered including perennial sow thistle and annual hawk’s beard. Canada thistle was the most common occurring in about 15 percent of plots. On highly disturbed sites it occurred at up to 12 % canopy cover. All other weed species occurred at trace levels of frequency and cover. 68
8.0 Literature cited Adams, B. W., G. Ehlert, C. Stone, M. Alexander, D. Lawrence, M. Willoughby, D. Moisey, C. Hincz, and A. Bogen. <strong>Range</strong> Health Assessment for Grassland, Forest and Tame Pasture. Public Lands Division, Alberta <strong>Sustainable</strong> Resource Development. Pub. No. T/044 105 pp Adams, G.D., G. Trottier, W. Strong, I.D. McDonald, S.J. Barry, P. Gregoire, G. Babish and G. Weis. 1997. Vegetation Component Report, CFB Suffield - National Wildlife Area, Wildlife Inventory. Canadian Wildlife Service, Edcmonton, 96 pp. Achuff, P.L., 1994. Natural regions, subregions and natural history themes of Alberta. A classification for protected areas management. Alberta Environmental Protection, Edmonton, Alberta. Archibald, J.H, G.D. Klappstein and I.G.W. Corns. 1996. Field guide to ecosites of southern Alberta. Nat. Resour. Can., Can. For. Serv., Northwest reg., North. For. Cent., Edmonton Alberta. Spec Rep. 8. Alberta Soil Information Centre (ASIC) 2001. AGRASID 3.0: Agricultural Region of Alberta Soil Inventory Database (Version 3.0). Edited by J. A, Brierley, T.C. Martin and D.J. Spies. Agriculture and Agri-Food Canada, and Alberta Agriculture, Food and Rural Development, Conservation and Development Branch. Edmonton, Alberta. Available: http://www.agric.gov.ab.ca/asic Beckingham, J.D. and J.H. Archibald. 1996. Field guide to ecosites of northern Alberta. Nat. Resour. Can., Can. For. Serv., Northwest reg., North. For. Cent., Edmonton Alberta. Spec Rep. 5. Brierley, J.A., Rodvang, A.T., and Pettapiece, W.W., 1991. Soil Survey of the Municipal District of Cardston (M.D. No. 6), Alberta. Land Resource Research Contribution No. 87-62. Alberta Institute of Pedology Report No. S-86-48. Edmonton, Alberta. Brown, D. 1997. Smooth brome (Bromus inermis Leyss) in <strong>Foothills</strong> <strong>Fescue</strong> grassland: stand characterization and the effects of cattle, sheep, mowing, glyphosate and fire. M.Sc. Thesis, University of Alberta, Edmonton, Alberta. 136 pp. Butler, L.D. 1997. National <strong>Range</strong> and Pasture Handbook. Grazing Lands Technology Inst, NRCS – USDA, Washington D.C. Busby, F.E. 1994. <strong>Range</strong>land Health – New Methods to Classify, Inventory and Monitor <strong>Range</strong>lands. National Academy of Science Report, National Research Council, Washington D.C. 180 pp. 69