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Spatial Variability of Long-Term Chloride Transport under Semiarid Conditions

Pedon Scale

^a Dep. of Renewable Resources, 751 General Services Building, Univ. of Alberta, Edmonton, AB T6G 2H1, Canada
^b V. P. Research Office, 3rd Floor University Hall, Univ. of Alberta, Edmonton, AB T6G 2J9, Canada
^c Dep. of Soil Science, 51 Campus Drive, Univ. of Saskatchewan, Saskatoon, SK S7N 5A8, Canada

View larger version (63K): [in a new window]   Fig. 1. Topographic map of field site with location of original potash (KCl) test plots. Intensive sampling transect (oriented north-south) and perpendicular sampling transect (oriented east-west) are represented by red lines. The background core is represented by a cross.

View larger version (24K): [in a new window]   Fig. 2. Variations in depth to layer interfaces along the intensive transect. The dotted vertical line indicates the intersection point of the perpendicular transect.

View larger version (25K): [in a new window]   Fig. 3. Variations in depth to layer interfaces along the perpendicular transect. The dashed vertical lines represent plot boundaries shown in Fig. 1. The dotted vertical line represents the intersection point of the intensive transect.

View larger version (52K): [in a new window]   Fig. 4. Spatial distribution of water contents with respect to layering along the intensive transect. Major layer interfaces (black lines) are superimposed.

View larger version (48K): [in a new window]   Fig. 5. Spatial distribution of water contents with respect to layering along the perpendicular transect. Major layer interfaces (black lines) are superimposed.

View larger version (54K): [in a new window]   Fig. 6. Spatial distribution of: (a) resident soil chloride concentrations with respect to layering; (b) mass recovery (Mj); (c) mean travel (Ej[z]) and modal transport depth; and (d) variance (Vj[z]) of the intensive transect. Mean travel depth is represented by triangles, and modal transport depth is represented by circles. The dashed reference lines represent the transect average value of that depth moment.

View larger version (46K): [in a new window]   Fig. 7. Spatial distribution of: (a) resident soil chloride concentrations with respect to layering; (b) mass recovery (Mj); (c) mean travel depth (Ej[z]); and (d) variance (Vj[z]) of the perpendicular transect. The dashed vertical lines represent plot boundaries shown in Fig. 1. The dotted lines on the mass recovery plot (b) represent estimated background mass of chloride and the calculated mass distribution following potash (KCl) applications in 1966 and 1971.

View larger version (14K): [in a new window]   Fig. 8. Relationship between modal transport depth and depth to the varved layer.

View larger version (14K): [in a new window]   Fig. 9. Relationship between varved layer thickness and variance (Vj[z]) for the intensive transect.

View larger version (13K): [in a new window]   Fig. 10. Relationship between mean travel depth (Ej[z]) and variance (Vj[z]) for the intensive transect.

View larger version (48K): [in a new window]   Fig. 11. Proposed conceptual model of the three-dimensional surface of the varved–silt layer interface.