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Soil Organic Matter Fractions under Managed Pine Plantations of the Southeastern USA

Daniel B. Warnell School of Forest Resources, Univ. of Georgia, D.W. Brooks Dr., Athens, GA 30602-2153

View larger version (33K): [in a new window]   Fig. 1. Proportion of total (a) soil C and (b) soil N in light, medium, hydrolyzable and residual fractions from upper surface soils under pine plantations across Lower Coastal Plain and Piedmont sites in Georgia and North Florida. Soils were sampled between 1998 and 2001 when pine stands ranged in age from 12 to 18 yr.

View larger version (27K): [in a new window]   Fig. 2. Contents of C and N in surface soils of control and herbicide plots. Eatonton (n = 4 at Age 12), Athens (n = 2 at Age 12), and Waycross (n = 4 at Age 12) were all sampled from 0- to 10-cm depth while N. Florida (n = 3 at Age 18) was sample through the genetic A horizon. Herbicide treatments were used to achieve complete competition control in these experimental plots.