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Soil property changes during loblolly pine production

Three watersheds, each approximately 25 ha, were instrumented to measure and record 
drainage rate, water table depth, rainfall and meteorological data. Data continuously collected on the site 
since 1988 include response of hydrologic and water quality variables for nearly all growth stages of a 
Loblolly pine plantation. Data for drainage outflow rates and water table elevations were used to 
determine field effective hydraulic conductivity, K, of the profile at various stages of the production cycle. 
K values of the top 90 cm of the profile for mature plantation forest were 60 to 95 m/day, which are 20 to 
30 times the values given in the soil survey for the Deloss series. Harvest did not appear to affect those 
values, but site preparation for regeneration, including bedding, reduced the effective K to values typically 
assumed for this series, 3.6 m/d for the top 45 cm and 1.6 m/d for deeper layers.