Table 2. BCT 2-series. The average values of various stand structure parameters from two sets of stands from sites in Northern, Central and Southern Sweden, with mean and dominating heights of 4 and 9 m or 5 and 10 m. The values are shown before and after different thinning operations. Stands with a dominating height of 9 m were subject to either selective boom corridor thinning with a corridor width of 1 m and a length of 10 m (BCT) or pre-commercial thinning (PCT). In contrast, stands with a dominating height of 10 m were subject to conventional selective thinning, boom-corridor thinning that targeted smaller-diameter trees (BCTlow), or boom-corridor thinning that targeted larger-diameter trees (BCThigh). Values with significant differences at the 0.05 probability level based on Tukey’s multiple comparison test are marked with different letters row-wise. Dg is basal area weighted diameter at breast height (1.3 m). Nsel demonstrates the average DBH for each plot calculated from the same number of stems as were left in the conventional thinning plot. The removal of deciduous trees was calculated based on the amount of deciduous trees in the plot before treatment.
Mean height/ Dominant height 4/9 m Mean height/ Dominant height 5/10 m
Parameter PCT BCT BCTlow BCThigh Conventional
Before After Before After Before After Before After Before After
All trees All trees DBH>80 mm All trees All trees DBH>80 mm All trees All trees DBH>80 mm All trees All trees DBH>80 mm All trees All trees DBH>80 mm
Stem Number ( ha–1) 7930a 2256a 611a 8456a 4259a 596a 9619a 4289a 852a 8959a 4611a 752a 7944a 1937a 767a
Deciduous
(N ha–1) 2196a 274b 2170 1267a 3222a 1623a 3315a 1767a 2626a 604a
(% of total) 29a 10b 27a 31a 33a 38a 33a 34a 28a 19a
Dominant height (m) 9.1a 7.8a 7.8a 7.9a 7.9a 7.9a 10.6a 10.4a 10.4a 10.3a 9.9a 9.9a 10.2a 10.0a 10.0a
Mean height (m) 4.0a 7.2a 7.4a 3.8a 5.2b 7.5a 4.8a 5.8a 8.4a 4.7a 6.3a 8.3a 4.7a 5.9a 8.3a
Dg (cm) 7.7a 8.8a 10.7a 8.0a 8.7a 10.8a 9.1a 9.9a 11.6a 9.2a 9.4a 11.3a 9.1a 10.5a 11.2a
Diam. Nsel (cm) 9.2a 8.5a 10.0a 9.8a 10.0a
Stem volume (m3 ha–1) 48.1a 33.7a 22.4a 54.6a 33.5a 21.7a 94.6a 49.1a 38.2a 94.5a 47.0a 34.4a 86.0a 38.3a 33.5a
Percent of before 70a 62a 53a 49a 43a
Biomass Dry weight (t ha1) 29.7a 20.3a 13.3a 33.3a 17.7a 12.9a 58.0a 29.1a 22.4a 54.8a 27.6a 20.0a 50.7a 22.4a 19.6a
Percent of before 68 a 55a 52a 50a 43a
Removal tot. (%):  
   Biomass 32a 45a 48a 50a 57a
   Stems 70a 46b 56a 52b 78b
Biomass Dry weight deciduous (t ha1) 2.4a 1.0a 1.2a 0.7a 3.4a 0.8a 1.9a 0.9a 1.3a 0.3a
Removal decid. (%):  
   Biomass 69a 55a 72a 61a 81a
   Stems 87a 40a 50a 48a 88a