Artikkelit jotka sisältää sanan 'tree stand'
Kunnostusojituksen vaikutus rämemänniköiden kehitykseen.
English title: Effects of maintaining ditch networks on the development of Scots pine stands.
Avainsanat:
forest drainage;
peatland;
ditch cleaning;
complementary ditching;
tree stand;
Pinus sylvestris L.;
volume growth
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Tekijät
This study aimed at finding out the effects of maintaining ditch systems by ditch cleaning and complementary ditching on volume growth of drained Scots pine (Pinus sylvestris L.) stands. Volume growth during the first ten post-treatment years was increased by 0.16 m3 ha-1 a-1 after ditch cleaning, 0.36 m3 ha-1 a-1 after complementary ditching, and 0.48 m3 ha-1 a-1 after the combined treatment. The average growth reactions during the second five-year period were considerably higher than during the first one. No drastic reductions in stand growth, however, occurred in the untreated plots during the post-treatment period of ten years.
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Lauhanen,
The Finnish Forest Research Institute, Kaironiementie 54, FIN-39700 Parkano, Finland
Sähköposti:
ei.tietoa@nn.oo
- Ahti, Sähköposti: ei.tietoa@nn.oo
Kunnostusojitustarpeen arviointi Pohjois-Suomessa.
English title: Evaluation of the need for ditch network maintenance in northern Finland.
Avainsanat:
forest drainage;
ditch cleaning;
complementary drainage;
tree stand;
stand growth;
decision making
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Tekijät
Factors affecting the need for ditch network maintenance in northern Finland were studied. In addition, the effect of ditch network maintenance on stand growth was estimated. A dataset containing ditch, tree stand, site type and climate variables was built up on the basis of the permanent sample plots (SINKA) on peatlands. Regression analysis as well as discriminant analysis were used to identify factors and criteria that could be used to identify sites that would respond to ditch network maintenance. Instead of the ditch condition class, ditch age and depth proved to be the variables reflecting the need for ditch network maintenance. The volume of the tree stand was influenced the most by the temperature sum and age of ditching. Stand volume growth was influenced the most by the volume of the tree stand. The site type index or the volume of the tree stand did not give useful information for the planning of ditch network maintenance. When ditch age was 10-40 years, complementary ditching increased annual stand growth of pine mires by 0.6-1.0 and 1.5-1.9 m3 ha-1 a-1 on spruce-birch swamps.
-
Lauhanen,
The Finnish Forest Research Institute, Parkano Research Station, FIN-39700 Parkano, Finland
Sähköposti:
ei.tietoa@nn.oo
- Piiroinen, Sähköposti: ei.tietoa@nn.oo
- Penttilä, Sähköposti: ei.tietoa@nn.oo
- Kolehmainen, Sähköposti: ei.tietoa@nn.oo
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