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Soil Physical Disturbance and Logging Residue Effects on Changes in Soil Productivity in Five-Year-Old Pine Plantations

^a Dep. of Forestry, 228 Cheatham Hall, Virginia Tech, Blacksburg, VA 24060
^b MeadWestvaco Corp., P.O. Box 1950, Summerville, SC 29484

View larger version (37K): [in a new window]   Fig. 1. Diagram illustrating soil physical disturbance classes after harvesting a poorly drained soil on a wet pine flat.

View larger version (83K): [in a new window]   Fig. 2. Percentage of cover for each residue type was determined separately and combined to determine the harvesting residue disturbance category. This diagram illustrates how a 20 x 20 m subplot with litter (95%), light slash (50%), heavy slash (15%), and piles (5%) might be superimposed on bare ground and each other. This example would be defined as a Class II site using the decision factors described in the METHODS section.

View larger version (38K): [in a new window]   Fig. 3. Hypothetical response of productivity to levels of physical disturbance and amounts of harvesting residues for two levels of site preparation.

View larger version (25K): [in a new window]   Fig. 4. Relative change in soil-site productivity between rotations based on the change in rank based on site index. (a) Soil physical disturbance categories. (b) Harvesting residue disturbance categories. Different letters indicate Fisher's least significant differences at the = 0.1 level using prior rank as a covariate.

View larger version (24K): [in a new window]   Fig. 5. Relative change in soil-site productivity between rotations based on the change in rank based on stand biomass. (a) Soil physical disturbance categories. (b) Harvesting residue disturbance categories. Different letters indicate Fisher's least significant differences at the = 0.1 level using prior rank as a covariate.