FRDA Report: Black Cottonwood and Balsam Poplar Managers ...

The remainder of this section consists of tables and figures that summarize growth
and yield data for western Canada black cottonwood and balsam poplar:
• yield estimates for cottonwood under four different management regimes
(Table 14);
• height-age/site index curves for British Columbia cottonwood age 0–50 years
(Figure 18) and 0–150 years (Figure 19);
• height-age table for determining balsam poplar site index derived from all forested
regions of Alberta (Table 15); and
• balsam poplar site index curves from Alberta data (Figure 20).
TABLE 14. Yield estimates for black cottonwood under four management regimes used by Scott Paper Limited
(as reproduced in McLennan 1990)
Natural
stands
Type of management system
Old Fraser
Valley veneer
plantationsa
45
Extensively
managed
pulpwood standsb
Intensively
managed
pulpwood standsb
Rotation age (yr) 30–50 25–35 25–30 15–20
Target tree size
(ht/dbh)
Target tree volume
(m3/tree)
Net stand volume
(m3/ha)
Stocking at harvest
(trees/ha)
32 m/40 cm 34 m/38 cm 35 m/40 cm 32 m/35 cm
1.5 1.5 1.5 1.5
250 280 300–500 300–500
200 236 250–350 400–450
MAId (m 3/ha per year)
Fraser Block 7.9c 10.0 10–20 15–30+
Upcoast Block 5.4c N/A 10–15 15–20
a Based on yield assessments of recently logged stands and stands approaching rotation age.
b Projections based on current growth rates and yield data from other areas.
c Based on old B.C. Forest Service inventory data. Currently being updated with 10 new growth and yield plots.
d Mean annual increment.