Table 2 Xylem and sapwood characteristics at the bases of trees ranging from 103 (mature) to 5 years old (seedlings) for Pseudotsuga menziesii trees and from 235 (old-growth) to 20 years old (young) for Pinus ponderosa trees (mean ± s.e.)
Species | Age class | Total xylem area (cm2) | Sapwood width (cm) | Sapwood area (cm2) | Proportion of sapwood (%) | Number of sapwood rings | Inner sapwood k s relative to outer sapwood k s |
|---|---|---|---|---|---|---|---|
Douglas-fir | |||||||
|  | Mature | 2650 ± 120 | 7.2 ± 0.7 | 759.6 ± 80.6 | 30 ± 5 | 30 ± 2 | 1.18 ± 0.06 |
|  | Intermediate | 331 ± 24 | 3.8 ± 0.3 | 200.5 ± 17 | 53 ± 3 | 10 ± 2 | 0.75 ± 0.05 |
|  | Young | 55 ± 4 | 1.9 ± 0.2 | 47.8 ± 1.8 | 89 ± 4 | 9 ± 2 | 0.46 ± 0.08 |
|  | Seedlings | 7 ± 1 | 0.6 ± 0.1 | 6.9 ± 0.7 | 99 ± 2 | 4 | N/A |
Ponderosa pine | |||||||
|  | Old-growth | 2950 ± 162 | 17.9 ± 1.6 | 2506 ± 137 | 85 ± 3 | 122 ± 8 | 0.80 ± 0.07 |
|  | Mature | 389 ± 71 | 9.8 ± 0.7 | 374.9 ± 71.1 | 97 ± 1 | 54 ± 3 | 0.51 ± 0.05 |
|  | Intermediate | 126 ± 25 | 6.30 ± 0.56 | 122.1 ± 12.9 | 98 ± 2 | 39 ± 6 | 0.59 ± 0.07 |
|  | Young | 90 ± 12 | 5.29 ± 0.23 | 89.7 ± 30.1 | 99 ± 1 | 19 ± 1 | N/A |