Table 1. Stand parameters for uneven-aged and even-aged stand (light and medium thinning) in spring 2003.
Stand type Start of experiment Area, ha Stand age, years Number of trees ha–1
> 2.5 cm DBH
Site index, H40 Standing volume,
m3 ha–1
Basal area, m2 ha–1 Diameter
(Dg), cm
Dominant height, m
Uneven-aged 1923 1.0 - 1266 20.2 a) 222 23.0 15.3 27.9
Even-aged light thinning 1951 0.101 81 1043 21.0 b) 710 55.9 26.1 28.1
Even-aged medium thinning 1951 0.065 81 1120 20.1 b) 649 51.0 23.6 27.4
a) Site index estimated by vegetation type (Nilsen and Larsson 1992).
b) Site index by dominant height at age 40 years in breast height (Tveite 1977).
Table 2. Total biomass in standing trees and distributed on different tree compartments and C in tree biomass and ground vegetation (Mg ha–1) in the experimental stands in 2003.
Experiment Biomass  
  Sum total
biomass
Stem
wood
Stem
bark
Living
branches
Dead
branches
Stump Coarse
roots
Fine
roots
C in tree
biomass
C in ground
vegetation
Uneven-aged 155 79 8 35 0.016 9 17 7 76 0.39
Even-aged
light thinning
450 266 21 74 0.013 23 49 15 220 0.70
Even-aged
medium thinning
407 211 19 68 0.013 21 44 15 199 0.52
Table 3. Mean annual harvest of stem volume (including natural mortality) in an 81 year period in uneven-aged stand and mean annual increment (81 year period) in even-aged stand, total C accumulation in tree biomass, current stem volume increment and current C-accumulation in all tree parts (incl. roots < 5 cm).
Experiment Mean annual
increment/harvest,
m3 ha–1 a–1
Total C accumulation in trees (81 year period),
Mg ha–1
Current stem volume
increment,
m3 ha–1 a–1
Current C accumulation,
kg ha–1 a–1
Uneven-aged 10.0 225 11.3 4130
Even-aged light thinning 11.0 276 23.0 5590
Even-aged medium thinning 10.0 248 24.2 5270
1

Fig. 1. Mean values and standard deviation (vertical bars) of C in litterfall during one year in the uneven-aged (n = 4) and even-aged stands (n = 2).

Table 4. O-horizon thickness (cm) and C stocks (Mg ha–1) in humus and mineral soil layers down to 1 m depth in the different treatments, standard deviation in brackets.
Exp. plot O-horizon C Mg ha–1
Thickness, cm O-horizon Mineral
(30 cm)
O and mineral
(100 cm)
Uneven-aged 8.30 (2.47) 53.7 (8.3) 103.2 (30.5) 198.8 (50.4)
Even-aged 7.25 (2.26) 43.6 (4.8) 100.8 (15.9) 178.1 (16.0)
2

Fig. 2. Average CO2 efflux in g m–2 h–1 and standard deviation at different occasions during the growing season 2003 inside and outside collars in the uneven-aged and even-aged stands.