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Overwinter Changes in Wind Erodibility of Clay Loam Soils in Southern Alberta

^a The Amalgamated Sugar Company LLC, P.O. Box 700, Paul, ID 83347-0700
^b Agriculture and Agri-Food Canada, Lethbridge Research Centre, P.O. Box 3000, Lethbridge, AB, Canada T1J 4B1
^c Battelle Washington Operations, 901 D Street, 370 L'Enfant Promenade SW, Suite 900, Washington, DC 20024-2115
^d Dep. of Renewable Resources, Univ. of Alberta, Edmonton, AB, Canada T6G 2E3

View larger version (29K): [in a new window]   Fig. 1. Relationship between cumulative days from start of study in fall and geometric mean diameter (GMD) for (a) Fairfield (1992-1993), (b) Wilson (1993-1994), and (c) Lethbridge (1994-1995) sites. For ease of interpretation the x-axis label is shown as date rather than cumulative days. Cumulative days are shown above or below data points. Day 1 = 18 Sept. 1992 at Fairfield; 26 Oct. 1993 at Wilson, and 30 Aug. 1994 at Lethbridge. Error bars = 1 standard error

View larger version (31K): [in a new window]   Fig. 2. Relationship between cumulative days from start of study in fall and erodible fraction (EF) for (a) Fairfield (1992-1993), (b) Wilson (1993-1994), and (c) Lethbridge (1994-1995) sites. For ease of interpretation, the x-axis label is shown as date rather than cumulative days. Cumulative days are shown above or below data points. Day 1 = 18 Sept. 1992 at Fairfield, 26 Oct. 1993 at Wilson, and 30 Aug. 1994 at Lethbridge. Error bars = 1 standard error

View larger version (29K): [in a new window]   Fig. 3. Relationship between cumulative days from start of study in fall on soil surface roughness (Cpar) for (a) Wilson (1993-1994) and (b) Lethbridge (1994-1995) sites. For ease of interpretation, the x-axis label is shown as date rather than cumulative days. Cumulative days are shown above or below data points. Day 1 = 26 Oct. 1993 at Wilson and 30 Aug. 1994 at Lethbridge. Error bars = 1 standard error

View larger version (30K): [in a new window]   Fig. 4. Schematic of overwinter processes affecting wind erodibility of bare clay loam soils in southern Alberta