In the five year period form 1986 – 1991 , the present disturbance class experienced 290 km2 (4.6% of the study area) of stand level disturbance. An area of 151 km2 of disturbance (2.4% of the analysis area) occurred prior to 1986, which represented a significant decrease from the past disturbance class in the 1984 – 1986 period. The total surface area of disturbed forest in 1991 was 441 km2 or 7% of the study site. The average annual disturbance for the 1986 – 1991 time step was 58 km2 or 0.92% of the analysis area.