Effects of logging-debris removal, vegetation control, and site quality on stand characteristics of coast Douglas-fir

Abstract

Silvicultural establishment practices can influence survival and growth of the succeeding stand, including effects on stand productivity and plant community composition. Vegetation control and logging-debris manipulation are two common practices that influence reforestation success, but their effectiveness is likely to vary with soil quality and its influence on plant resource supply. We established an experimental manipulation of logging debris (removed, retained, or piled) and vegetation control (initial site preparation or annual herbicide application for 5 years) at two sites that contrasted strongly in soil quality. Tree growth and survival, vegetation communities, and soil properties were monitored for 15 years to assess the effects of treatments. At both sites, annual vegetation control increased Douglas-fir volume, ranging from a 30% to 160% increase at the low-quality site depending on logging-debris treatment, and by 30% on average at the high-quality site.

Parent Publication

• Foundational concepts in silviculture with emphasis on reforestation and early stand improvement - 2022 National Silviculture Workshop

Citation

Slesak, Robert A.; Harrington, Timothy B. 2022. Effects of logging-debris removal, vegetation control, and site quality on stand characteristics of coast Douglas-fir. In: Jain, Theresa B.; Schuler, Thomas M. [comp.]. Foundational concepts in silviculture with emphasis on reforestation and early stand improvement - 2022 National Silviculture Workshop. Proc. RMRS-P-80. Fort Collins, CO: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station. 3 p.