Suo - Mires and peat vol. 42 no. 1 | 1991

Hannu Hökkä, Timo Penttilä. Suometsätieteellinen tutkimus Ruotsissa.
English title: Peatland forestry research in Sweden.
Avainsanat: Drainage; regeneration; Classification; nutrient status
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Former and present peatland forestry studies by the Department of Forest Soils of the Swedish University of Agricultural Sciences (Umeå) are presented, based on a tour to field experiments in north, mid and south Sweden. Up to the 1970s, major interest was paid to the nutrition of drained, originally treeless or sparsely treed fens and bogs. Several fertilization experiments since the first wood ash trials in Norra Hällmyren have indicated the necessity of P and K application to ensure afforestation and satisfactory growth of Scots pine on such sites. Silvicultural problems on drained peatlands, such as regeneration on highly productive peatlands, planting techniques, commercial thinnings, as well as gas exchange in peat and the distribution of nutrients in a peatland forest ecosystem are the focus of a large-scale project started in 1985. The preliminary results of the regeneration experiments, i.e. the effectiviness of spruce shelter wood (140-200 trees per ha) against frost damage during the growing season, are discussed. A brief description of the present classification and post-drainage site index system for peatlands is also given. Keywords: Classification, drainage, nutrient status, regeneration
  • Hökkä, Finnish Forest Research Institute, Rovaniemi Research Station, P.O. Box 16, SF-96301 Rovaniemi, Finland Sähköposti: ei.tietoa@nn.oo (sähköposti)
  • Penttilä, Sähköposti: ei.tietoa@nn.oo
Seppo Kaunisto, Timo Viinamäki. Lannoituksen ja leppäsekoituksen vaikutus mäntytaimikon kehitykseen ja suonpohjaturpeen ominaisuuksiin Aitonevalla.
English title: Effect of fertilization and alder (Alnus incana) mixture on the development of young Scots pine (Pinus sylvestris) trees and the peat properties in a peat cutover area at Aitoneva, southern Finland.
Avainsanat: Foliar nutrients; peat nutrients; peat thickness; root penetration
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The alder mixture and fertilization, both separately and especially together increased the growth of pine and the mass and length of roots, and decreased mortality of trees. Alder mixture increased the amounts of phosphorus and potassium in peat as compared to the alderless plots. The thickness of the peat layer (range 0.24-0.72 m) was negatively correlated with the growth of pine, the foliar P and K concentrations and the root mass and length. In no case were roots found in the peat layer closest to the subsoil. Obviously the peat layer should not be thicker than 30 cm, even if fertilized, for growing pine in a peat cutover area. Keywords: Foliar nutrients, peat nutrients, peat thickness, root penetration
  • Kaunisto, The Finnish Forest Research Institute, Parkano Research Station, SF-39700 Parkano, Finland Sähköposti: ei.tietoa@nn.oo (sähköposti)
  • Viinamäki, Sähköposti: ei.tietoa@nn.oo

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