Artikkelit kirjoittajalta Marja-Leena Piiroinen

Anu Hilli, Marja-Leena Päätalo, Mikko Moilanen, Marja-Leena Piiroinen. Verhopuuston tiheyden ja lannoituksen vaikutus kuusen taimien pituuskasvuun ojitetulla turvemaalla.
English title: The effect nurse crop density and fertilization on the height growth of Norway spruce seedlings on drained peatland.
Avainsanat: peatland; Foliar nutrients; Betula pubescens; growth responses; Picea abies; planting; release cutting
Tiivistelmä | Näytä lisätiedot | Artikkeli PDF-muodossa | Tekijät
A natural understorey of Norway spruce often develops under birch on oligo-mesotrophic peatlands, but spruce can also be planted on these sites. The effects of fertilization and the density of the pubescent birch nurse crop on the height growth and needle nutrient status of a planted spruce understorey on an old drained herb-rich sedge pine fen was investigated in this study. The spruce transplants were planted early in the 1960’s. The nurse crop was removed, thinned to 200 stems ha-1 or left unmanaged in 1988. A number of plots were also fertilized. The height growth of the spruce transplants was measured during two periods after management, and the needle nutrient concentrations were determined before fertilization and again 10 years later. The height growth of the spruce was 40 - 60% greater after removal of the nurse crop than that under the unthinned nurse crop. Even the thinned nurse crop slowed down the growth of the understorey. However, height growth was the best on the plots on which the nurse crop was removed and the plots fertilized.
  • Hilli, OSLA, Kirkkotie 1, FIN-91500 Muhos, Finland Sähköposti: ei.tietoa@nn.oo (sähköposti)
  • Päätalo, Sähköposti: ei.tietoa@nn.oo
  • Moilanen, Sähköposti: ei.tietoa@nn.oo
  • Piiroinen, Sähköposti: ei.tietoa@nn.oo
Risto Lauhanen, Marja-Leena Piiroinen, Timo Penttilä, Eero Kolehmainen. 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
Tiivistelmä | Näytä lisätiedot | Artikkeli PDF-muodossa | 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 (sähköposti)
  • Piiroinen, Sähköposti: ei.tietoa@nn.oo
  • Penttilä, Sähköposti: ei.tietoa@nn.oo
  • Kolehmainen, Sähköposti: ei.tietoa@nn.oo

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