%0 Research article
%T Cambium dynamics of Pinus sylvestris and Betula spp. in the northern boreal forest in Finland
%A Schmitt, Uwe
%A Jalkanen, Risto
%A Eckstein, Dieter
%D 2004
%J Silva Fennica
%V 38
%N 2
%R doi:10.14214/sf.426
%U https://silvafennica.fi/article/426
%X Wood formation dynamics of pine and birch along a south-north transect  in Finnish Lapland were determined by the pinning technique. For all  trees at all sites a more or less sigmoid shape of the wood formation  intensity is characteristic with a slow beginning, a faster growth in  the middle and a decreasing activity towards the end of the vegetation  period. Wood formation of pine started at sites 1–3 (southern sites) in  the second week of June and at sites 4 and 5 (northern sites) only in  the last week of June, whereas wood formation ended within the first  half of August. Wood formation of birch started in the second half of  June and ended around the beginning of August. First cells were laid  down by pine and birch when the temperature sum had reached the level of  85 to 90 degree days and 110 to 120 degree days, respectively. The  intensity of wood formation in pine was highest in July, in birch within  two weeks in the middle of July. Wood formation in pine lasted for  about seven weeks at the southernmost and about six weeks at the  northernmost site. In birch, the duration of wood formation was about  five weeks at the southernmost site and around three weeks at the other  sites.