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Table 2 Number of sample plots by soil depth category and tree species used in the development of the longitudinal height-diameter models

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