Suo - Mires and peat vol. 47 no. 3 | 1996
Neulasten pääravinnepitoisuuksien muutokset turvekankaan alikasvoskuusikossa ylispuuhakkuun jälkeen.
English title: Effects of the removal of shelterwood on the foliar nutrient concentrations of Norway spruce (Picea abies (L.) Karst.) on drained peatlands.
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Abstract: The foliar chemical composition of a Norway spruce underwood were analysed one year before and in three years after the removal of a downy birch (Betula pubescens Ehrh.) shelterwood on an old drainage area. The most remarkable change due to the release was considered to be the significant decrease in the potassium concentrations. The nitrogen concentrations increased very strongly, and phosphorus increased slightly but not significantly during the first growth period after the release, decreasing later to a level approaching the deficiency limit. Consequently the nutrient balance between N and K was strongly shaken by the increased N/K-ratio. One reason for that might be the increased use of K in the growing points of roots after the root competition of shelterwood was eliminated.
Key words: foliar analysis, nutrients, peatlands, Picea abies, shelterwood, underwood.
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Saarinen,
The Finnish Forest Research Institute, Parkano Research Station, Kaironiementie 54, FIN-39700 Parkano, Finland
Sähköposti:
ei.tietoa@nn.oo
Lannoituksen vaikutus kuusikoiden kasvuun ja ravinnetilaan ojitetuilla turvemailla Pohjois-Suomessa.
English title: Effects of fertilization on tree growt and nutrient status of Norway spruce stands on drained peatlands in northern Finland.
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Abstract: The stand-level responses to fertilization and refertilization were studied in seven factorial field experiments established in 1974-1976. The factors were nitrogen fertilization (N) and phosphorus-potassium fertilization (PK). The factorial treatments were applied at two levels: (i) control and (ii) fertilized with a dosage following the currently used Finnish forest fertilization guide-lines. The spruce-dominated stands were selected from areas drained according to normal forestry practises between 1932 and 1969. The sites covered fairly well the trophic variation that occurs on spruce-dominated peatlands in the mid-boreal zone in Finland. Tree growth was monitored during two periods of five to seven years. The second period followed the refertilization in 1985. At the end of the second period, one-year-old sun-exposed needles were sampled from the four southernmost stands for nutrient analyses. The effects of fertilization on tree growth were generally fairly weak and insignificant, especially during the first study period. After refertilization, the effect of N was positive in three stands on mesotrophic sites. The foliar nutrient analyses of unfertilized spruces showed low concentrations of N, P and Cu. PK-fertilization increased foliar P concentrations and, in some cases, also K concentrations. Since the PK-fertilizer included some borate, it also increased foliar B concentrations. N-fertilization did not affect foliar N, P or K concentrations but it decreased foliar concentrations of Ca, Zn, and B in some cases. Both the growth responses and the foliar nutrient analyses indicated that nitrogen was the most deficient macro-nutrient.
Key words: foliar nutrients, growth responses, mires, nitrogen, phosphorus, Picea abies, potassium
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Moilanen,
The Finnish Forest Research Institute, Muhos Research Station, Kirkkosaarentie, FIN-91500 Muhos, Finland
Sähköposti:
ei.tietoa@nn.oo
- Penttilä, Sähköposti: ei.tietoa@nn.oo
- Issakainen, Sähköposti: ei.tietoa@nn.oo
Painomaan vaikutus metsitetyn turvepellon ravinnemääriin.
English title: Effect of mineral soil admixture on the nutrient amounts of afforested peat fields.
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The effect of mineral soil, applied during the cultivation of fields, on the nutrient amounts of afforested peat fields was studied. 36 afforested peat fields (peat layer>40 cm) from Central Ostrobothnia (western Finland) and North Savo (central Finland) were sampled. Fields were divided into two groups on the basis of mineral soil addition. Volumetric soil samples (0-10, 10-20, 20-30, 30-40 cm layers) were taken and and analyzed for their total and ammonium acetate extractable nutrient concentrations (P, K, Ca, Mg, Mn, Fe, Zn). Kjeldahl nitrogen and boron in H3PO4-H2SO4 were also analyzed. Nutrient amounts in different soil layers were calculated. Mineral soil, mainly silt, had been added on average 230 m3ha-1 in Central Ostrobothnia and 630 m3ha-1 in North Savo. Mineral soil was clearly detectable in the plough layer (0-20 cm) but seldom in the 30-40 cm layer as an increased bulk density and ash content. Mineral soil admixture increased most of the total nutrient amounts, but not nitrogen, calcium and boron. In the amounts of extractable nutrients the effect of mineral soil admixture was smaller.
Key words: afforestation, mineral soil, nutrition, peat fields
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Wall,
The Finnish Forest Research Institute, Kannus Research Station, P.O.Box 44, FIN-69101 Kannus, Finland
Sähköposti:
ei.tietoa@nn.oo
- Hytönen, Sähköposti: ei.tietoa@nn.oo
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