Nom du corpus

Corpus Systématique Végétale

Titre du document

Multivariate analysis of vegetational variation in different habitats at Omayed, Egypt

Lien vers le document
Éditeur
Springer (journals)
Langue(s) du document
Anglais
Type de document
Research-article
Mots-clés d'auteur
  • Egypt
  • Environment
  • Mediterranean desert
  • Multivariate analysis
  • Vegetation
Nom du fichier dans la ressource
Syst_veg6_v2_016304
Auteur(s)
  • M. Abdel-Razik 1
  • M. Abdel-Aziz 1
  • M. Ayyad 1
Affiliation(s)
  • 1) Botany Department, Faculty of Science, University of Alexandria, Egypt
Résumé

The application of indicator species analysis has proved useful in classifying stands into groupings coinciding with topographic variations. 41 indicator pseudo-species are identified in the vegetation along a phytosociological gradient: some are characteristic of specific habitats, and the others indicate transition between groups of habitats. The use of qualitative estimations (transformed density records) in multivariate analysis in the present study indicates that they may be more preferable than quantitative estimations, because of their easy and fast recording in the field, and the less comprehensive computations, while yielding precise results. The X-axis of the reciprocal averaging ordination is related to the salinity and fertility gradients, while the Y-axis reflects soil texture. The phytosociological gradients of the canonical variate axes reflect essentially contrasts between groups of species, each correlated with one or the other of the environmental gradients. Comparing the results obtained by the two ordination methods (reciprocal averaging and canonical variates) we find that the first method detects the overall phytosociological changes along strong environmental gradients which would be helpful in studying large surveys. On the other hand, the second technique, which is mainly predictive, is more sensitive to changes within both the phytosociological and environmental gradients and can detect the impact of these changes on the overall variance of each gradient.

Catégories INIST
  • 1 - sciences appliquees, technologies et medecines
  • 2 - sciences biologiques et medicales
  • 3 - sciences biologiques fondamentales et appliquees. psychologie
Catégories Scopus
  • 1 - Life Sciences ; 2 - Agricultural and Biological Sciences ; 3 - Plant Science
  • 1 - Physical Sciences ; 2 - Environmental Science ; 3 - Ecology
Identifiant ISTEX
4B45C44577E4A1949249C54EEF881E983CA58342
Revue

Vegetatio

Année de publication
1984
Présence de XML structuré
Non
Score qualité du texte
8.463
Version PDF
1.3
Type de publication
Journal
ark:/67375/1BB-0CSPM50M-H
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