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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Plant ecology 34 (1977), S. 21-39 
    ISSN: 1573-5052
    Keywords: Italy ; Majella ; Numerical classification ; Phytosociology ; Principal component analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung Durch pflanzensoziologische Studien der Majella-Gipfel mittels Multivarianzmethoden wurden die vier folgenden Assoziationen neu festgestellt:Gnaphalio-Plantaginetum atratae auf Humuskarbonatböden in Schneetälchen, Leontopodio-Elynetum auf Rendzina in windexponierten Stellen,Saxifrago-Papaveretum julici undCrepidi-Leondontetum montani auf Protorendzina mit Schutt.Gnaphalio-Plantaginetum atratae undLeontopodio-Elynetum könnten zu denElyno-Seslerietea gestellt werden, obwohl die zuerst genannte Gesellschaft Charakterarten derSalicetea herbaceae enthält;Saxifrago-Papaveretum julici undCrepidi-Leontodontetum montani werden zum neuen VerbandThlaspidion stylosi derThlaspidietea gestellt. Vergleiche zwischen einigen Schwarmmethoden (clustering methods) und Ordinationsmethoden, die auf den mathematischen Grundlagen der ‘prineipal component’ Analyse beruhen, werden diskutiert. Die Effizienz der ‘sum of squares agglomeration’ bei Variation der Pflanzengemeinschaften in einem Kontinuum und die Wichtigkeit der linearisierenden Transformation bei der ‘principal component’ Analyse werden betont.
    Notes: Summary A phytosociological study of Majella's summits by the use of multivariate methods has allowed to discover the following new associations:Gnaphalio-Plantaginetum atratae on humocarbonatic soils in snowy depressions,Leontopodio-Elynetum on rendzina in wind exposed and stony places,Saxifrago-Papaveretum julici andCrepidi-Leontodontetum montani on protorendzina with gravel.Gnaphalio-Plantaginetum atratae andLeontopodio-Elynetum might be classified inElyno-Seslerietea, although the former presents character species ofSalicetea herbaceae; Saxifrago-Papaveretum julici andCrepidi-Leontodontetum montani are classified inThlaspidion stylosi (foeder. nova) ofThlaspidietea. Comparisons between some clustering methods and between ordination methods based on the mathematics of principal component analysis are discussed. The efficiency of sum of squares agglomeration when the plant communities vary in a continuum and the importance of a linearizing transformation in principal component analysis are stressed.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Plant ecology 39 (1979), S. 123-125 
    ISSN: 1573-5052
    Keywords: Ranking ; Relevé ; Selection
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary When a very large number of phytosociological types have to be compared, a reduction of the number of relevés is desirable. In this paper a method of relevé selection from given phytosociological tables is suggested. The method is based on a sum of squares criterion. The advantage, in comparison with other selection procedures, is that this method provides a means on the basis of which the efficiency of a relevé selection can be objectively measured.
    Type of Medium: Electronic Resource
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  • 3
    Publication Date: 1979-05-01
    Print ISSN: 1385-0237
    Electronic ISSN: 1573-5052
    Topics: Biology
    Published by Springer
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  • 4
    Publication Date: 1977-04-01
    Print ISSN: 1385-0237
    Electronic ISSN: 1573-5052
    Topics: Biology
    Published by Springer
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