Artikkelit kirjoittajalta Marja-Leena Päätalo

Marja-Leena Päätalo, Anu Hilli, Mikko Moilanen, Eila Tillman-Sutela. 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 (sähköposti)
  • Hilli, Sähköposti: ei.tietoa@nn.oo
  • Moilanen, Sähköposti: ei.tietoa@nn.oo
  • Tillman-Sutela, Sähköposti: ei.tietoa@nn.oo
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

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