Wednesday, 9 November 2005
10

Site Impacts Associated with a Long Leaf Restoration Project in Lower Alabama.

Emily A. Carter, USDA Forest Service, 520 Devall Drive, Auburn, AL 36849, John P. Fulton, Biosystems Engineering, Auburn University, 216 Tom Corley Building, Auburn University, AL 36849, and Brian J. Burton, School of Civil and Environmental Engineering, Auburn University, 238 Harbert Engineering Center, Auburn University, AL 36849.

A study was initiated in 2003 to evaluate the impacts associated with converting a slash pine stand to long leaf in the Conecuh National Forest, Alabama. A 26 hectare slash pine stand was harvested in Summer 2003 and replanted with long leaf pine in Winter 2005. A subsection of the harvested area was evaluated for soil surface disturbances as a result of machine trafficking by laying 10 transects along hillslope segments and visually classifying surface disturbances every 4 meters. Soil physical properties including bulk density, gravimetric water content, and soil strength were measured for three distubance categories: trafficked, skid trail, and untrafficked. In addition, erosion potential of the harvested area was monitored by establishing silt fences on hillslopes of similar slope length and steepness. Statistical results (ANOVA)indicated that disturbance class was significant for soil strenth but not bulk density. Transect location was not significant for soil strength or bulk density. Soil strength, bulk density, and soil moisture were typically higher in skid trail locations followed by trafficked locations. Soil strength and bulk density levels were elevated to approximately 2.5 MPa and 1.50 Mg/m^3, respectively, in the subsurface of skid trail locations. Gravimetric water content was measured at 12.5% in surface layers of skid trail locations. Erosion estimates ranged between 0.011 and 0.038 kg/m^2. Data indicated that soil strength increased linearly to a bulk density level of 1.5 Mg/m^3 and leveled off thereafter.

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