Article 1563 Table 2

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 (BCT_low), or boom-corridor thinning that targeted larger-diameter trees (BCT_high). 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). N_sel 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

BCT_low

BCT_high

Conventional

Before

After

Before

After

Before

After

Before

After

Before

After

All trees

DBH>80 mm

All trees

DBH>80 mm

All trees

DBH>80 mm

All trees

DBH>80 mm

All trees

DBH>80 mm

Stem Number ( ha^–1)

7930^a

2256^a

611^a

8456^a

4259^a

596^a

9619^a

4289^a

852^a

8959^a

4611^a

752^a

7944^a

1937^a

767^a

Deciduous

(N ha^–1)

2196^a

274^b

2170

1267^a

3222^a

1623^a

3315^a

1767^a

2626^a

604^a

(% of total)

29^a

10^b

27^a

31^a

33^a

38^a

33^a

34^a

28^a

19^a

Dominant height (m)

9.1^a

7.8^a

7.9^a

10.6^a

10.4^a

10.3^a

9.9^a

10.2^a

10.0^a

Mean height (m)

4.0^a

7.2^a

7.4^a

3.8^a

5.2^b

7.5^a

4.8^a

5.8^a

8.4^a

4.7^a

6.3^a

8.3^a

4.7^a

5.9^a

8.3^a

Dg(cm)

7.7^a

8.8^a

10.7^a

8.0^a

8.7^a

10.8^a

9.1^a

9.9^a

11.6^a

9.2^a

9.4^a

11.3^a

9.1^a

10.5^a

11.2^a

Diam. N_sel (cm)

9.2^a

8.5^a

10.0^a

9.8^a

10.0^a

Stem volume (m³ha^–1)

48.1^a

33.7^a

22.4^a

54.6^a

33.5^a

21.7^a

94.6^a

49.1^a

38.2^a

94.5^a

47.0^a

34.4^a

86.0^a

38.3^a

33.5^a

Percent of before

70^a

62^a

53^a

49^a

43^a

Biomass Dry weight (t ha^–¹)

29.7^a

20.3^a

13.3^a

33.3^a

17.7^a

12.9^a

58.0^a

29.1^a

22.4^a

54.8^a

27.6^a

20.0^a

50.7^a

22.4^a

19.6^a

Percent of before

68^a

55^a

52^a

50^a

43^a

Removal tot. (%):

Biomass

32^a

45^a

48^a

50^a

57^a

Stems

70^a

46^b

56^a

52^b

78^b

Biomass Dry weight deciduous (t ha^–¹)

2.4^a

1.0^a

1.2^a

0.7^a

3.4^a

0.8^a

1.9^a

0.9^a

1.3^a

0.3^a

Removal decid. (%):

Biomass

69^a

55^a

72^a

61^a

81^a

Stems

87^a

40^a

50^a

48^a

88^a