Botanikai-Természetvédelmi Folyóirat

Journal of Pannonian Botany

Kitaibelia vol. 3 – no. 2. (1998) p.299-301.

Vegetációtérképezés és numerikus szüntaxonómia
Bagi István
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Kivonat:

The vegetation mapping based on the Zürich-Montpellier (ZM) methodology demands extended experience and a kind of sense for cenology. The mentioned two conditions could not have quantifying, they are subjective, moreover intuitive. Maps that were made by the allocation of relevés were classified into together by numerical methods have the appearance of higher objectivity. The case studies are presented in this contribution by comparison of the numerical groups of relevés and the ZM-classifications refer that the application of multivariate methods needs certain understandings. Partly, depending on the vegetation period, the classification of cenological relevés gave different results. In case of meadow communities, the numerical analysis of spring (early summer) vegetation gave the most similar clusters of relevés compared the ZMclassification. On the other hand, in spite of the objectivity of numerical analyses, their application has subjective elements, e.g. the method selection, the determination of valid similarity value. In addition, the numerical methods do not differentiate among the plant taxa according to their cenological affinity, growing forms, therefore e.g. the physiognomy of the vegetation has no additional information, while it is very important for a cenologist in the identification of the communities. In a numerical analysis, a taxon does not mean more than its attributes (e.g. cover values) that have been used in the analysis. The application of numerical methods may be useful complement of vegetation mapping based on ZM-methodology of phytosociology both in classification of the vegetation units as well as in the localization of borders existing between them, but it does not able substitute the cenological experience.