Suo - Mires and peat vol. 54 no. 3 | 2003
Koivuverhopuuston tiheyden ja kuusialikasvoksen pituuden tasauksen vaikutus taimikon pituuskasvuun ojitusalueella.
English title: Impact of birch crop density and heigth equalization of Norway spruce understorey on spruce seedlings' height growth on a drained peatland.
Avainsanat:
Betula pubescens;
Picea abies;
drained peatland;
height equalization;
height growth;
natural seedlings;
nurse crop density;
understorey
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A viable understorey of Norway spruce often develops under a nurse crop on nutrientrich
peatlands drained for forestry. The impact of birch nurse crop density and height
equalization of the Norway spruce understorey on the height growth of spruce seedlings
was studied on three sites: on a transforming herbrich spruce swamp, an abandoned
peat field and a mixed peat/mineral soil field. The nurse crop was managed in
1990: 1) no thinning, 4000 stems ha-1, 2) thinning to 1000 stems ha-1. 3) thinning to
500 stems ha-1, or 4) removal of the nurse crop. In addition, the spruce seedlings over
1 m in height were removed from randomized halves of each plot. The unmanaged
nurse crop reduced the growth of the understorey the most on all the sites. On the other
hand, the spruce seedlings grew the best on the plots where the nurse crop had been
removed. Due to height equalization the growth of the spruce understorey first slowed
down, but towards the end of the study period the height growth of the equalized and
non-equalized spruce understoreys were almost the same.
-
Päätalo,
The Finnish Forest Research Institute, Muhos Research Station, Kirkkosaarentie 7, FIN-91500 Muhos, Finland
Sähköposti:
ei.tietoa@nn.oo
- Hilli, Sähköposti: ei.tietoa@nn.oo
- Moilanen, Sähköposti: ei.tietoa@nn.oo
- Tillman-Sutela, Sähköposti: ei.tietoa@nn.oo
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
- Päivänen, Sähköposti: ei.tietoa@nn.oo
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