The effect of provenance and spacing on stem straightness and number of spike knots of Scots pine in south and central Sweden
Prescher, Finnvid; Ståhl, Erik G.
Ten provenance trials located between latitude 55o37' and 60o32' were studied. Over all locations. at the age of 30 years. 40% of the trees had at least one spike knot up to 5 metres height. Furthermore about 60% of the trees were not straight enough to produce a first class bottom log of saw timber. Significant differences existed between provenances for both traits. Environmental differences also had a major effect on Scots pine quality. The southern. tallest. provenances were less straight than northern ones. On the contrary. within each provenance the tall trees were also straighter and had less spike knots than short trees. Spacing effects showed that the number of trees suitable for first class saw timber were approximately 50 per cent higher in the 1.25 m spacing than in the 2.0 m spacing. The joint effect of provenance transfer and spacing on stem straightness. indicated that with the same minimum requirements. a change in spacing from 2.0 m to 1.25 m. corresponded to the effect of a southward provenance transfer of 2o of latitude.
Pinus sylvestris, L.; provenance; spacing effects; stem straightness; spike knot
Studia Forestalia Suecica
Publisher: Faculty of Forestry, Swedish University of Agricultural Sciences
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