Height increment of understorey Norway spruces under different tree canopies

Forest Ecosystems

Table 1 Description of modeling data (5601 spruce seedlings)

Variable	Minimum	Maximum	Mean	Standard deviation
Site index, m	18	30	24.84	2.47
Paludification,%	0	100	7.15	19.10
Canopy trees:
Basal area, m²/ha	2	52	19.38	10.10
•pine	0	43	4.24	8.35
•spruce	0	41	10.46	9.93
•hardwood	0	34	4.68	7.32
Mean diameter, cm	4.2	78	23.41	10.62
Harwood seedlings:
Number	0	22043	2765.92	3420.73
Mean height, m	0	7	2.17	1.51
Spruce seedlings:
Height, m	0.1	6.0	1.51	1.12
Height increment, m	0.0	1.0	0.12	0.13