Harvest Flow Objectives. A harvest flow is developed by gradually adjusting the harvest level to arrive at a balance between the short- and the long-term harvest level. A wide range of harvest flows is possible. Choices include: non-declining even flow (constant, no changes over time); non-declining (but possibly rising) flow; and variable flow (possibly rising, or falling, or both) over time. For example, the last TSR harvest flow for the Kootenay Lake TSA was a declining pattern from a high of 645,000 m³/year during decades 1 and 2, decreasing to 544,000 m³/year by decade 4 (Figure 10).
Harvest Flow Objectives. The AAC Rationale expresses confidence in the harvest flow objectives used in the OSLRMP revised base case analysis. In developing that projection, the following objectives were sought: • Sustain the current AAC for as long as possible; • Decrease the periodic harvest rate in acceptable steps (≤ 10%) when declines are required to meet all objectives associated with the various resources on the land base; • Do not permit the mid-term harvest to fall below a level reflecting basic maintenance of the productive capacity of the TSA (ex. VDYP-based LRSY estimate); and • Achieve an even-flow long-term supply over a 250-year time horizon.
Harvest Flow Objectives. Forest cover objectives and the biological capacity of the net timber harvesting land base (THLB) ultimately dictate the harvest level. However, a number of alternative harvest flows are possible. In this analysis, the main objective is to: • Identify the amount of pine able to be harvested to determine an appropriate initial harvest level; • To mitigate the impact of MPB on the mid-term timber supply; and • Have a long run harvest level that reflects managed stand yields and non-timber resource values, and is sustainable.
