Suo - Mires and peat vol. 54 no. 2 | 2003
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
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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
- Päätalo, Sähköposti: ei.tietoa@nn.oo
- Moilanen, Sähköposti: ei.tietoa@nn.oo
- Piiroinen, Sähköposti: ei.tietoa@nn.oo
Jatkolannoituksen ja kasvatustiheyden vaikutus nuorten mäntymetsiköiden ravinnetilaan sekä puuston ja juuriston kehitykseen paksuturpeisella suonpohjalla.
English title: Effect of refertilisation and growing on the nutrition, growth and root development of young Scots pine stands in a peat cutaway area with deep peat layers.
Avainsanat:
afforestation;
root penetration;
Pinus sylvestris;
nutrition;
Fertilisation;
cutaway peatlands;
N/P ratio
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The effects of refertilisation and growing density on the soil and tree nutrition, root
penetration and growth of Scots pine stands were studied in a cutaway peatland area
with deep peat layers. The fertilisation treatments were control, N1975+PKB1985 and
PK1975+PKB1996 refertilisations and those of the growing density <1 300, 1 654 and
1 954 trees ha-1. The maximum root penetration varied between 26 and 34 cm independently
of the treatments. The N/P ratios in pine needles were quite high even on the
refertilised plots (11.6-15.7). The duration of P fertilisation seems to be shorter (about
15 years) on cutaway peatlands with deep peat layers than on drained peatland forests.
The greatest yield without natural removal (239 m3 ha-1, on an average) in 35-years-old
stands was measured on plots, which had the highest growing density and had been
repeatedly fertilised with PK. The results show that quite a high yield of Scots pine can
be reached on cutaway peatlands. However, pine has to be fertilised with PK at the
afforestation stage and at least once later if the remaining peat layer is 40-60 cm, and
possibly several broadcast fertilisations are needed on peat layers deeper than 60 cm. It
seems that growing tree stands on cutaway peatlands in higher densities than in conventional
forestry may improve nutrient cycling in stands and hence decrease leaching
of nutrients from the site.
-
Aro,
Finnish Forest Research Institute, Parkano Research Station, Kaironiementie 54, FIN-39700 Parkano
Sähköposti:
ei.tietoa@nn.oo
- Kaunisto, Sähköposti: ei.tietoa@nn.oo
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