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Maximum Bulk Density of British Columbia Forest Soils from the Proctor Test: Relationships with Selected Physical and Chemical Properties

^a Faculty of Forestry, Univ. of British Columbia, Vancouver, BC V6T 1Z4, Canada
^b British Columbia Ministry of Forests and Range, Research Branch, Vernon, BC V1B 2C7, Canada
^c Dep. of Geography, Simon Fraser Univ., Burnaby, BC V5A 1S6, Canada

View larger version (37K): [in this window] [in a new window]   Fig. 1. Location of 33 study sites in British Columbia. Sites 1–3, 5, and 6 are oil-exploration-disturbed sites; Sites 4, 7, 11, 15–18, and 22–26 are long-term soil productivity study installations; Sites 13, 14, and 19 are long-term landing rehabilitation sites; Sites 20 and 21 are stumping-disturbed sites; Sites 8–10 and 12 are road rehabilitation sites; and Sites 27–33 are provincial park sites.

View larger version (11K): [in this window] [in a new window]   Fig. 2. Change of (a) soil bulk density and (b) porosity with water content (W) in the standard Proctor test. The bottom curve in (a) is hypothetical, derived by replacing the particle density of 2.97 with 2.33 Mg m–3.

View larger version (18K): [in this window] [in a new window]   Fig. 3. Plasticity of soils from the study areas, showing highly plastic soils with liquid limit >0.50 and soils with moderate and low plasticity (liquid limit <0.50) as plotted on the Casagrande chart. The A-line represents the division between clays (plot on or above the A-line) and silts (plot below the A-line); the U-line refers to the upper limit.

View larger version (19K): [in this window] [in a new window]   Fig. 4. Relationships among maximum bulk density (MBD) and clay + silt (fsi = fine silt; msi = medium silt) for (a) all samples, (b) nonplastic samples, (c) moderate and low plastic samples, and (d) highly plastic samples. ***Significant at P < 0.001.

View larger version (18K): [in this window] [in a new window]   Fig. 5. Relationships between clay and total C for (a) all samples, (b) nonplastic samples, (c) moderate and low plastic samples, and (d) highly plastic samples. ***Significant at P < 0.001.