Analysis Units. An analysis unit represents a combination of stands dominated by specific tree species or a particular silvicultural regime with a specific timber growing capability — as indicated by the inventory type group and site index in the forest inventory file. Each analysis unit is assigned timber volume projections (yield tables) for both existing and future stands. Table 8.5 provides a description of analysis units used in the Okanagan TSA timber supply analysis. Existing stands less than 21 years of age are considered managed stands and are excluded from pooling to determine average attributes for the analysis units listed below. Table 8.5 Analysis units as per TSR 13 Mature 34 <= 140 >= 14.5 175,843 19.0 Fir (Fd) wet - 1-8 27 32- 14 Mature 34 <= 140 < 14.5 28,425 13.0 Fir (Fd) wet - 1-8 27 32- 15 Mature 34 > 140 >= 14.5 42,214 17.1 Fir (Fd) wet - 1-8 27 32- 17 Cedar (Cw) 9-11 <= 140 >= 16 13,287 19.4 18 Cedar (Cw) 9-11 <= 140 < 16 5,317 13.7 19 Cedar (Cw) 9-11 > 140 >= 16 14,676 17.4 20 Cedar (Cw) 9-11 > 140 < 16 20,256 14.2 21 Hemlock (Hw) 12-17 <= 140 >= 15 13,877 18.4 22 Hemlock (Hw) 12-17 <= 140 < 15 4,497 12.6 23 Hemlock (Hw) 12-17 > 140 >= 15 13,083 16.2 24 Hemlock (Hw) 12-17 > 140 < 15 17,747 12.5 25 Balsam (B) 18-20 <= 140 >= 13 33,175 15.5 26 Balsam (B) 18-20 <= 140 < 13 8,068 11.2 27 Balsam (B) 18-20 > 140 >= 13 13,494 14.1 28 Balsam (B) 18-20 > 140 < 13 52,615 11.1 29 Spruce (S) 21-26 <= 140 >= 12.5 33,959 16.3 30 Spruce (S) 21-26 <= 140 < 12.5 2,577 10.6 31 Spruce (S) 21-26 > 140 >= 12.5 25,352 15.2 32 Spruce (S) 21-26 > 140 < 12.5 52,650 10.3 Lodgepole Pine 33 (Pl) 28-31 <= 140 >= 13.5 182,592 16.5 Lodgepole Pine 34 (Pl) 28-31 <= 140 < 13.5 27,891 12.2 Lodgepole Pine 35 (Pl) 28-31 > 140 >= 13.5 32,162 16.0 Lodgepole Pine 36 (Pl) 28-31 > 140 < 13.5 10,980 11.7 Analysis units have been restructured for the incremental silviculture scenarios. The incremental silviculture analysis units used the following criteria: • Maintain a 140 year age split to allow OGSI productivity estimates methodology; • Two productivity groupings per analysis unit; • Wet belt/Dry belt; and • Adjustments for suitability for incremental silviculture options. Table 8.6 Analysis units for incremental silviculture ID Description Dry / Wet Inventory Type Groups Age Base Age 50 Site Index Productive Land base (ha) Net Harvestable Land base (ha) Area Weighted Average Site Index 3 Fir (Fd) Wet 1-8,27,32,33,34 20 < age <= 140 >= 14.5 189,074 150,925 19.3 4 Fir (Fd) Wet 1-8,27,32,33,...
Analysis Units. An analysis unit represents stands homogeneous in terms of tree species or silvicultural prescription. Each analysis unit is assigned its own timber volume and height growth projections (yield tables) for existing and future (managed) stands. As part of this project X.X. Xxxxxxx and Associates Ltd. were contracted to redefine the analysis units and associated yield and height growth functions within the Vanderhoof Forest District. These analysis units and yield tables are incorporated into the timber supply model. The methodology, procedure and results associated with this project are documented in an accompanying report, Natural and Managed Stand Yield Tables for the Vanderhoof Innovative Forestry Practices Agreement Second Innovative Analysis. (XX Xxxxxxx and Associates Ltd., 2003).
