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Paper Information

Journal:   JOURNAL OF SCIENCES (ISLAMIC AZAD UNIVERSITY)   WINTER 2008 , Volume 17 , Number 66/1 (BIOLOGY ISSUE); Page(s) 63 To 72.
 
Paper: 

INVESTIGATION OF PLANT SPECIES DIVERSITY IN GRAZED AND UNGRAZED AREAS BY USE OF ABUNDANCE DISTRIBUTION MODELS

 
 
Author(s):  AKAFI HAMID REZA*, EJTEHADI H.
 
* DEPT. OF BIOLOGY, ISLAMIC AZAD UNIVERSITY, FALAVARJAN BRANCH, ISFAHAN, IRAN
 
Abstract: 

Todays, population explosion, industrial development and environmental pressure caused destruction of habitats and biomes. A possible solution is application of knowledge of community ecology by the studying of species diversity. A glance to the related literature reveals a wide range of numerical indices used to characterize diversity of communities. But in order to prevent the problems that numerical indices create in diversity comparison, using other parameters is suitable. To obtain this aim, in this research it is used abundance distribution models, diversity ordering and rank - abundance distribution. In order to get a more clear-cut notion of the species abundance distribution of the sites, goodness of fit test were checked. In this study, two grazed and ungrazed area with the same climate, were selected. The results proved that diversity of ungrazed area was higher than the grazed one, because their profiles of diversity ordering were above the grazed site. The ungrazed site had a more flattened curve and the grazed site followed both log normal and logarithmic distribution and has shifted from lognormal to logarithmic model. They show an environmental disturbance factor dominates this grazing site.

 
Keyword(s): DIVERSITY, PARAMETRIC INDICES, SPECIES ABUNDANCE MODELS
 
References: 
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