Jussi Kuusipalo , Jukka Vuorinen

Pintakasvillisuuden sukkessiosta vanhalla ojitusalueella Itä-Suomessa

Kuusipalo J., Vuorinen J. Pintakasvillisuuden sukkessiosta vanhalla ojitusalueella Itä-Suomessa.

Tiivistelmä

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.

Vastaanotettu 31.10.2017 Julkaistu 1.1.1981

Katselukerrat 2805

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