Artikkelit jotka sisältää sanan 'stand development'
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.
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Sarkkola,
Department of Forest Ecology, P. O. Box 27, Fin-00014 University of Helsinki
Sähköposti:
ei.tietoa@nn.oo
- Päivänen, Sähköposti: ei.tietoa@nn.oo
Rämemäntyalkuperien kehityksestä kangasmaalla.
English title: Development of mire originated Scots pine on mineral soil.
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Scots pine (Pinus sylvestris) transplants (2+1+1 or 1+2 years old), the seeds of which had been collected from mire pines in different localities of South Finland, were planted in the early 1930s in a sandy Vaccinium site type at Tuusula (60°22´ N; 25°00´ E), north of Helsinki. The sample plots have been measured several times. At the time of the latest inventory the stands were about 50 years old. The stand development (standing volume, volume increment, dominant height, stem form) has been compared with the local mineral soil stands. The results show that seeds originated from mire pines produce offspring with form and growth (phenotypes) similar to those of pines originating from mineral soil.
Keywords: Hereditary, mire, Scots pine, stand development, stem form, peatland
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Päivänen,
Department of Peatland Forestry, University of Helsinki, Unioninkatu 40B, SF-00170 Helsinki, Finland
Sähköposti:
ei.tietoa@nn.oo
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Ruuhijärvi R.,
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