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On the use of ordination models in phytosociology

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Summary

Q-type ordination methods are emphasized in general phytosociological studies. A new modification of the simple ordination method is introduced as principal axes ordination. Its relation to the theoretically preferred principal components analysis is discussed. A new simple similarity coefficient based on both similarity and disimilarity components is proposed.

Four examples of application are given: ordination of structural characters, of stands, of successional relationships and of vegetation types.

The concept of isocene is introduced; examples of isocene patterns in ordination models are given.

The prospects of synecological and synsystematical interpretation of phytosociological ordination models for the Zürich-Montpellier school are discussed.

Zusammenfassung

Ordinationsmethoden vom Q-Typus werden empfohlen in allgemeinen phytosoziologischen Untersuchungen. Eine Modifikation der einfachen Ordinationsmethode wird eingeführt als Prinzipale Achsen Ordination. Ihre Beziehungen mit der theoretisch vorzuziehenden Prinzipalen Komponenten Analyse werden diskutiert. Ein neuer Similaritätskoeffizient, basiert auf Similarität und Dissimilarität, wird vorgeschlagen.

Vier Beispiele von Anwendungen werden gegeben: Ordination von Strukturmerkmalen, von Aufnahmen, von Sukzessionsbeziehungen und von Vegetationstypen.

Der Isozön-Begriff wird introduziert. Beispiele von Isozön-Karten werden gegeben.

Die Perspektiven der synökologischen und synsystematischen Interpretation von phytosoziologischen Ordinationsmodellen für die Zürich-Montpellier Schule werden diskutiert.

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van der Maarel, E. On the use of ordination models in phytosociology. Vegetatio Acta Geobot 19, 21–46 (1969). https://doi.org/10.1007/BF00259002

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