Canadian Forest Service Publications
Estimating impacts of forest harvesting and mechanical site preparation practices on productivity in British Columbia. 1991. Senyk, J.P.; Smith, R.B. Pages 199-211 in W.J. Dyck and C.A. Mees, Editors. Long-term Field Trials to Assess Environmental Impacts of Harvesting, Proceedings: IEA/BE T6/A6 Workshop, February 1990. Florida, USA. New Zealand Forest Research Institute, Rotorua, New Zealand, IEA/BE/A6 Report No.5 / FRI Bulletin No. 161.
Issued by: Pacific Forestry Centre
Catalog ID: 3129
Availability: Order paper copy (free)
The development and current status of research on impacts of log skidding and mechanical site preparation operations on site productivity in British Columbia are reviewed. Early work centered around retrospective studies in 8 to 20-year-old cutovers, whereas later research has also utilized plantations established for the express purpose of studying impacts. Advantages and disadvantages of these two approaches are discussed. Means of dealing with limited areas of specific disturbance categories and with the problems of monitoring responses over a long period of time are discussed. Summaries of research indicate that reduced productivity is the most usual result for trees growing on landings, constructed skidroads, heavily used skidtrails, and on some types of mechanically prepared ground, but examples of soil disturbance enhancing growth are also presented. Unexplained variation in results can be reduced by controlling competing vegetation, controlling the forestry operation, and by simulating soil disturbance over a range of pre-determined levels.