From: Longitudinal height-diameter curves for Norway spruce, Scots pine and silver birch in Norway based on shape constraint additive regression 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