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Forest Soil Productivity of Mined Land in the Midwestern and Eastern Coalfield Regions

Dep. of Forestry (0324), 228 Cheatham Hall, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061

View larger version (41K): [in a new window]   Fig. 1. General location of study sites in the midwestern and Appalachian coalfields.

View larger version (102K): [in a new window]   Fig. 2. Typical site and plot layout used at each study site.

View larger version (24K): [in a new window]   Fig. 3. Relative productivity of nonmined (zero baseline) and mined sites in the midwestern and eastern coalfields. Grey bars represent mined sites planted to pine species; open bars represent mined sites planted to hardwood species. *Difference between mined and nonmined sites (p 0.10). Site index is the height of a white oak canopy at Age 50.

View larger version (32K): [in a new window]   Fig. 4. Distribution of site index as a function of five selected mine soil properties across 14 mined study sites. Figure 4F shows the nontransformed, general functions for the soil properties that are non-linear with site index. Regression depicts predicted site index based on observed values of each soil variable while others held constant at their average. Available water-holding capacity (AWHC) represents centimeters of water held between field capacity and wilting point for the total profile depth on each site.

View larger version (39K): [in a new window]   Fig. 5. Estimated site index over a range of profile available water-holding capacity (AWHC) as a function of mined site base saturation, C horizon total porosity, electrical conductivity, and coarse fragments. Available water-holding capacity (AWHC) represents centimeters of water held between field capacity and wilting point for the total profile depth on each site.