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Soil Wetness and Traffic Level Effects on Bulk Density and Air-Filled Porosity of Compacted Boreal Forest Soils

Forest Resources, Alberta Research Council, P.O. Bag 4000, Vegreville, AB, Canada, T9C 1T4

View larger version (18K): [in a new window]   Fig. 1. Location of research sites in West-Central Alberta.

View larger version (44K): [in a new window]   Fig. 2. Details of plot installation in each cutblock.

View larger version (20K): [in a new window]   Fig. 3. Effects of number of skidding cycles on medium-textured boreal forest soils by wide-tired skidders and forwarders (Table 1) on soil bulk density. Data for all 14 sites (Table 2) were combined by depth and number of skidding cycles to produce the means and standard errors.

View larger version (28K): [in a new window]   Fig. 4. Comparison of the probability level of changes in bulk density and air-filled porosity following trafficking (3 cycles) of medium-textured boreal forest soils by wide-tired skidders and forwarders (Table 1) as a function of gravimetric soil water content or water potential. Soil water content and potential means and standard errors (horizontal bars) are shown for each site labeled by site number (Table 1).

View larger version (21K): [in a new window]   Fig. 5. Effects of number of skidding cycles on medium-textured boreal forest soils by wide-tired skidders and forwarders (Table 1) on air-filled porosity of wet soil. Air-filled porosity was measured in the field using an air pycnometer after the soil was trafficked. Only air-filled porosity data (Table 2) for the sites and depths that had a soil water potential of -15 kPa or higher (Table 1), were combined to produce the means and standard errors.