Rapid regeneration of forest land following final harvest or natural disaster is both economically and environmentally important. Any increase in erosion, water yield and storm flow coming from a logged site diminishes rapidly as the site revegetates. Root systems remain in place many years after trees are cut and provide soil stability, which reduces the risk of erosion. Trees also intercept water and impede stormwater runoff. Many sites require some type of treatment to accomplish quick and effective regeneration of desirable tree species or to reduce some undesired effects of harvesting. Two major problems associated with site preparation include soil erosion and potential sedimentation from runoff. Primary factors contributing to accelerated erosion from runoff are percent of the area with exposed soil, type of soil, degree of slope and ground cover. Techniques used for site preparation should be based on soils, slope, condition of the site, natural vegetation, crop tree species and cost. Soils with a shallow surface layer generally have limited capacity to absorb water and are more likely to erode. Steeper slopes provide more rainwater runoff velocity, and thus energy, to erode soils. Ground cover helps hold soil in place and dissipates some of the energy of rainfall.
Send to friend