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1 August 2008 Classification Structure of Floodplain Forests in Estonia: A Comparison of Two Classification Approaches
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Flooded forests in 79 sample areas were studied in various parts of Estonia. Using the principal component analysis and cluster analysis, six community types were established: (i) Tilia cordataMercurialis perennis, (ii) Ulmus laevisAllium ursinum, (iii) Populus tremulaConvallaria majalis, (iv) Alnus incanaCirsium oleraceum, (v) Alnus glutinosaFilipendula ulmaria and, (vi) Alnus glutinosaCarex acutiformis. The species composition of these types partly overlaps but the abundance proportions of species are clearly different and all types have several significant indicator species. Another classification scheme was established by TWlNSPAN analysis. Following the phytosociological approach, the communities belong to QuercoFagetea, AlnoUlmion (PrunoFraxinetum, FicarioUlmetum, Pruno padiAlnetum incanae, the latter subdivided further into P.p.—A.i. var. Frangida alnus and P.p.—A.i. var. Urtica dioica), and to Alnetea glutinosae, Alnion (Carici elongataeAlnetum, represented with two subassociations: C.e.—A. typicum and C.e.—A. cardaminetosum). Despite different concepts used for establishment of community types by either approach the obtained results are rather similar. The syntaxa of AlnoUlmion show particularly high internal variability, although all recognised communities have unambiguous affinities with the assemblages described elsewhere from central and northern-central Europe.

© Finnish Zoological and Botanical Publishing Board 2008
Jaanus Paal, Normunds Prieditis, Reet Rannik, and Eva-Maria Jeletsky "Classification Structure of Floodplain Forests in Estonia: A Comparison of Two Classification Approaches," Annales Botanici Fennici 45(4), 255-268, (1 August 2008).
Received: 30 July 2007; Accepted: 1 March 2008; Published: 1 August 2008

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