Yield Responses of Black Spruce to Forest Vegetation Management Treatments: Initial Responses and Rotational Projections

Figure 1

Seventy-five year temporal size-density trajectories for upland black spruce plantations situated on low-medium quality sites (site index = 14): Regime 1—no FVM treatment applied; Regime 2—FVM treatment with an expected effect of a 15.7% height gain at age 7; and Regime 3—FVM applied with an expected effect of a 40.0% height gain at age 7. Graphically, illustrating the (1) isolines for mean dominant height (Hd; 4–20 m by 2 m intervals), quadratic mean diameter (Dq; 4–26 cm by 2 cm intervals), and mean live crown ratio (Lr; 35, 40, 50, …, 80%), and (2) crown closure line (lower boundary of the size-density space as delineated by the lower left diagonal solid line) and the self-thinning rule (upper boundary of the size-density space as delineated by the upper right diagonal solid line).