%0 Research note
%T Carbon stores and fluxes in even- and uneven-aged Norway spruce stands
%A Nilsen, Petter
%A Strand, Line Tau
%D 2013
%J Silva Fennica
%V 47
%N 4
%R doi:10.14214/sf.1024
%U https://silvafennica.fi/article/1024
%X This investigation compares present C stores, fluxes and historic tree C sequestration in an uneven-aged and an even-aged Norway spruce stand under similar high productive soil conditions in south-eastern Norway. A selection cutting system has been performed in the uneven-aged forest stand for 81 years and the even-aged stand was established after clear-cutting 81 years ago. Timber productivity has been measured in the uneven stand for 81 years and in the even-aged stand for 52 years. C storage was determined based on tree measurements, tree biomass functions, soil samples and C analyses from trees and soil. Litter fall was sampled during one year and CO<sub>2</sub> efflux from the soil was measured during one growing season. The present tree C storage (including roots) was 210 Mg C ha<sup>-1</sup> in the even-aged stand and 76 Mg C ha<sup>-1</sup> in the uneven-aged stand, while the corresponding figures for C in the soil was 178 and 199 Mg C ha<sup>-1</sup>. The long term timber production in the uneven-aged stand was measured to be 95% of the even-aged stand and the difference in net C sequestration was 37 Mg ha<sup>-1</sup> in an 81 year period in favour the even-aged stand. The highest present CO<sub>2</sub> efflux from soil was measured in the even-aged stand. The total net C sequestered in trees during 81 years minus the present soil C-stock accounts to 16 Mg ha<sup>-1</sup> in favour the even-aged system