Table 2 Number of sample plots by soil depth category and tree species used in the development of the longitudinal height-diameter models
| Soil depth category (only mineral soil) SD | |||||
|---|---|---|---|---|---|
| I (0–25 cm) | II (25–50 cm) | III (50–100 cm) | IV (>100 cm) | Sum | |
| Norway spruce | 622 | 1552 | 1203 | 2256 | 5633 |
| Scots pine | 1363 | 1342 | 653 | 1469 | 4827 |
| Silver birch | 1220 | 1987 | 1429 | 2516 | 7152 |