Artikkelit jotka sisältää sanan 'Picea mariana'

Sakari Sarkkola, Juhani Päivänen. Mustakuusen ja männyn istutustaimikon kehitys karulla ojitetulla suolla.
English title: Development of planted black spruce and Scots pine on an oligotrophic drained peatland.
Avainsanat: afforestation; Pinus sylvestris; Picea mariana; treeless peatlands; young stand development
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The development, structure, production and fertilisation of planted black spruce (Picea mariana (Mill.) B.S.P) and Scots pine (Pinus sylvestris L.) stands growing on a drained, originally treeless Sphagnum papillosum fen (LkKaN) in Central Finland up to the age of 30 years were studied. For black spruce the stem number was 2250 stems ha–1, dominant height was ca 7.1 m, the mean stand volume 26 m3 ha–1, the annual mean volume increment 1.5 m3 ha–1 and the total mortality based on stem number was 21%. For Scots pine the comparable characteristics were 1015 stems ha–1, 10.4 m, 45 m3 ha-1 , 3.3 m3 ha-1 and 59% respectively. Fertilisation had no apparent impact on the stand characteristics. About 63% of the planted black spruce individuals had at least one vegetatively generated layer. High number of layers seemed to have a negative effect on dominant parent tree growth. It is concluded that growth and yield of black spruce are generally not competitive in operational forestry in Finland. However, black spruce could be used as an alternative tree species in treeless areas that resist afforestation, and it might also be cultivated for decorative purposes.
  • Sarkkola, Department of Forest Ecology, P. O. Box 27, Fin-00014 University of Helsinki Sähköposti: ei.tietoa@nn.oo (sähköposti)
  • Päivänen, Sähköposti: ei.tietoa@nn.oo
Hannu Hökkä, Art Groot. Katsaus viimeaikaisiin tutkimuksiin mustakuusen (Picea mariana) kasvatuksesta Pohjois-Ontarion turvemailla.
English title: Recent studies on black spruce management on peatlands in northern Ontario. A literature review.
Avainsanat: peatlands; succession; regeneration; stand management; Picea mariana; stand structure
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Black spruce (Picea mariana, (Mill.) B.S.P.) has been traditionally managed as evenaged stands with artificial or natural regeneration on peatlands of northern Ontario Clay Belt region. However, lack of resources to make artificial regeneration on all clear-cuts and harvest methods unfavorable for natural regeneration often resulted in unsatisfactory regeneration. As a consequence, alternative management methods have been introduced for peatland black spruce, and this literature review discusses studies of these methods. In natural stands, both evenaged and uneven-aged structures may be found, while the second-growth stands originating from old horse-logging are mostly uneven-aged, with abundant advance growth. Currently, mechanized harvest with regeneration protection has been shown to sufficiently preserve residual trees and subsequently produce stands that are heterogeneous with respect to the size structure. In second-growth stands, uneven-aged management can be implemented with minimum diameter limits determined from stand structure and cut-to-length harvesting. Such management perpetuates a stand structure appropriate for uneven-aged management. Simulation study has been made to estimate black spruce yield under uneven-aged management with varying cutting cycle and minimum diameter limit. It seems that in some peatland sites uneven-aged management is a possibility to manage black spruce.
  • Hökkä, The Finnish Forest Research Institute, Rovaniemi Research station, P.O. Box 16, FIN-96301 Rovaniemi, Finland Sähköposti: ei.tietoa@nn.oo (sähköposti)
  • Groot, Sähköposti: ei.tietoa@nn.oo

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