Artikkelit kirjoittajalta Jussi Kuusipalo
Kasvillisuuden muutokset rämeillä ojituksen ja lannoituksen jalkeen.
English title: Vegetation changes after drainage and fertilization in pine mires.
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The effects of drainage and fertilization (both slowly and readily soluble fertilizers were included) on the above-ground biomass and cover of understorey vegetation were studied in two mires situated at Lammi, southern Finland, and at Ilomantsi, northern Karelia. Urea and especially micronutrients decreased the cover of Sphagnum species. Slowly soluble nitrogen also decreased the cover of Sphagnum, but not as efficiently. In fen site types the cover and biomass of Vaccinium oxycoccos and Andromeda polifolia increased strongly after fertilization. The greatest change in vegetation was caused by micronutrients given together with macronutrients. The cover and biomass of Eriophorum vaginatum and Rubus chamaemorus increased on all the fertilization plots probably because phosphorus was included in all the treatments. Calluna vulgaris and Empetrum nigrum benefited from the NPK fertilization on hummock sites.
Keywords: Apatite, biodiversity, biomass, biotite, peatland forestry, urea
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Vasander,
Department of Forest Ecology, P.O. Box 24 (Unioninkatu 40 B), FIN-00014 University of Helsinki, Finland
Sähköposti:
ei.tietoa@nn.oo
- Kuusipalo, Sähköposti: ei.tietoa@nn.oo
- Lindholm, Sähköposti: ei.tietoa@nn.oo
Pintakasvillisuuden sukkessiosta vanhalla ojitusalueella Itä-Suomessa.
English title: Vegetation succession on an old, drained peatland area in eastern Finland.
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The ground vegetation on three peatland sites in Ilomantsi (eastern Finland), drained for forestry some four decades ago, was investigated. The cover data were analyzed with principal component analysis (PCA) and detrended correspondence analysis (DECORANA) in order to see the main community types and major ecological gradients. The original peatland site type was identified by studying peat stratigraphy. The vegetation, especially on the Eriophorum vaginatum-dominated pine bog, is diverse including several types of plant communities. The communities form a mosaic that is differentiated by changing physical environment and biological effects, for example hummock-forming processes. Some communities are of heath forest character due to the influence of former drainage; some are kind of "relicts" from original quite wet and mesotrophic vegetation. The main community type is almost pure Eriophorum vaginatum-surface consisting of vital tussocks. It is probably not originally dominating community type but have become widespread due to the influence of incomplete forest drainage. Because the vegetation structure is a mosaic of diverse kinds of community types and successions, it is difficult to define major successional trend for the site as a whole. The classical generalizations of succession and climax are not very usable to explain the successional processes of peatland vegetation. On such kind of previously drained areas it is also difficult to define the original bog type and to estimate the site fertility for practical forestry purposes. Peat stratigraphy may give more information on this question.
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Kuusipalo,
Sähköposti:
ei.tietoa@nn.oo
- Vuorinen, Sähköposti: ei.tietoa@nn.oo
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