Stand density management decision-support program for simulating multiple thinning regimes within black spruce plantations

The utility of currently available software programs for use in black spruce, Picea mariana (Mill.) B.S.P., density management is becoming limited due to the increasing complexity of treatments. Consequently, the objectives of this study were to develop and subsequently demonstrate a decision-support program for stand density management involving multiple thinning treatments applicable to plantations established in Ontario, Quebec, New Brunswick and Newfoundland. The resultant PC-based program enables forest managers to predict 75-year sizedensity trajectories for three density control regimes simultaneously, given a common planting density. Specifically, the program: (1) graphically illustrates the expected site-specific trajectories for each regime within the context of a stand density management diagram; (2) calculates and tabulates annual, treatment-specific and cumulative rotational yield estimates and associated performance indices for overall productivity, relative product value, and degree of optimal site occupancy; and (3) graphically illustrates production curves for volumetric yield and product size. Additionally, instructions on acquiring an executable version of the program via the Internet are included.