Suo - Mires and peat vol. 48 no. 4 | 1997
Lannoituksen vaikutus hieskoivikoiden kasvuun ja ravinnetilaan ojitetuilla turvemailla Pohjois-Suomessa.
English title: Effect of fertilization on growth and foliar nutrient status of pubescent birch stands on drained mires in northern Finland.
Avainsanat:
nitrogen;
phosphorus;
potassium;
peatland;
Foliar nutrients;
Betula pubescens;
growth responses
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The effects of fertilization and refertilization on the growth of pubescent birch (Betula pubescens) stands growing on drained peatlands in northern Finland were studied in eight field experiments. The treatments were: (i) control with no fertilization, (ii) fertilization with nitrogen (N), (iii) fertilization with phosphorus and potassium (PK), and (iv) fertilization with nitrogen, phosphorus, and potassium (NPK). The sites represented four different mesotrophic to eutrophic site types with stand median heights ranging from 7 m to 13 m. Tree growth was monitored at stand level during periods of five to eleven years following the setting up of the experiments and during periods of 4 to 7 years following the repetition of the treatments in 1985. At the end of the second period, sun-exposed leaves were sampled from two stands in August 1990 for the purpose of conducting foliar nutrient analyses. The first-time fertilization treatments did not affect tree growth on any of the site types. Following the repetition of the treatments, the stands responded positively to NPK or PK fertilization on all site types except on the shallow-peated herb-rich peatland forest. There was no response to mere N-fertilization on any of the site types. The growth responses observed were weaker than those reported for Scots pine in similar climatic conditions.
Key words: Betula pubescens, foliar nutrients, growth responses, nitrogen, peatland, phosphorus, potassium
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Penttilä,
The Finnish Forest Research Institute, Rovaniemi Research Station, P.O.Box 16, FIN-96301 Rovaniemi, Finland
Sähköposti:
ei.tietoa@nn.oo
- Moilanen, Sähköposti: ei.tietoa@nn.oo
Hidasliukoisten fosforilannoitteiden ominaisuudet ja käyttökelpoisuus suometsien lannoituksessa. Kirjallisuuteen perustuva tarkastelu.
English title: Properties of slow release phosphorus fertilizers with special reference to their use on drained peatland forests. A review.
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Slow-release phosphorus fertilizers have long been considered as a primary fertilization option on drained peatland forests in Finland. There has also been growing interest in using slow-release P-fertilizers as a better alternative to water-soluble fertilizers on agricultural land. Manufacture of different P-fertilizers, and those fertilizer and site properties which affect the rate of P release, are reviewed. The effects of slow-release P-fertilizers on plant growth and the liability to be leached into waterways are also discussed. In particular, the behaviour of slow-release P-fertilizers on drained peatland forests is considered.
Key words: fertilizer dissolution, fertilizer leaching, phosphate minerals, peatland forestry
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Nieminen,
The Finnish Forest Research Institute, Vantaa Research Centre, P. O. Box 18, FIN-01301, Vantaa, Finland
Sähköposti:
ei.tietoa@nn.oo
Karjalan tasavallan Vodlajärven kansallispuistossa sijaitsevan Lishkansuon kasvillisuus.
English title: Vegetation of Lishkmokh mire in Vodlozersky National Park, eastern Karelian republic, Russia.
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The article presents the results of Finnish-Karelian co-operation in mire conservation research with the aim to study the diversity of mires in Finland and Russian Karelia on a uniform basis. The classification of mires in Finnish and Karelian schools of vegetation science has been compared. The vegetation of Lishkmokh mire has been studied using aerial photographs and field surveys. The area consists of ombrotrophic bog complexes as well as aapamires, all in a totally virgin state. As a result of the surveys, two maps of vegetation have been compiled. Results of vegetation analyses in releves have been presented in the form of tables and DCA ordination. According to the Finnish mire classification, 32 mire site types have been distinguished, which is a high number in an area of c. 2000 ha. On the basis of the high diversity of site types, and the occurrence of some rare plant species, e.g. Juncus stygius, Drepanocladus vernicosus and Meesia triquetra as well as some eastern species like Rubus humulifolius and Polygonum bistorta, the conservation value of Lishkmokh mire can be considered as very high.
Key words: Karelia, mire classification, mire conservation, mire vegetation
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Antipin,
Karelian Research Centre, Biological Institute, Laboratory of mire ecosystems, Pushkinskaya 11, RUS-185610 Petrozavodsk, Karelia, Russia
Sähköposti:
ei.tietoa@nn.oo
- Heikkilä, Sähköposti: ei.tietoa@nn.oo
- Lindholm, Sähköposti: ei.tietoa@nn.oo
- Tokarev, Sähköposti: ei.tietoa@nn.oo
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