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- Borhani, M., Arzani, H., Feizi, M., Saidfar, M., Khodagholi, M.& Ghaedi, A., 2010. Final report range assessment program in different areas of Isfahan province, Isfahan Research Center for Agriculture and Natural Resources.
- Ebrahimi Kebria, KH., Shokri, M.& Tamartash, R., 2002. Effect of topography and grazing factors on vegetation percent and diversity changes for river basin Harraz. MSc thesis, Mazandran University. 54 PP.
- Fisher, R.A., Corbet, A.S.& Williams, C.B., 1943. The relation between the number of species and the number of individuals in a random sample of an animal population. Animal Ecology 12 : 42-58.
- Krebs, C.J., 1999. Ecological methodology, 2ed Edition. Happer & Row, New York, 620p.
- Magurran, A. E., 2003. Measuring biological diversity. Blackwell Publishing, 256p.
- Mesdaghi, M., 2002. Vegetation description and analysis. Mashhad University Publications, 287P.
- Mirdavoodi, H. R.& Zahedi Poor, H., 2005. Determination of suitable species diversity model for Meyghan playa plant association and effect of some ecological factors on diversity change. Pajouhesh & Sazandegi 68: 56-65.
- Motomura, I., 1932. On the statistical treatment of communities (in Japanese). Zool. Tokyo 44: 379-383.
- Oliveira, F.F.& Batalha, M.A., 2005. Lognormal abundance distribution of woody species in a cerrado fragment. Revista Brasil. Bot. 28(1): 39-45.
- Soudi, P., 1993.Living treasure saving earth's threatened biodiversity. Dept. of the Environment, 53P.
- Vandermeer, J. H., 1981. Elementary mathematical ecology. Wiley Publishers, 294p.
397 - 387 . pp . 2010 , 3 . No , 63 . Vol , Iranian Journal of Natural Resources ,
Journal of Range and Watershed Management
397
Distributions of Species Diversity Abundance Models and Relationship between Ecological Factors with Hill (
N1) Species
Diversity Index in 4 Range Sites of Isfahan Province
E. Ghehsareh Ardestani*1, M. Bassiri2, M. Tarkesh3 and M. Borhani4
1MSc.Graduate, Isfahan University of Technology, Isfahan, I.R. Iran
2 Associate Prof., College of Natural Resources, Isfahan University of Technology, Isfahan, I.R. Iran
3Assistant Prof., College of Natural Resources, Isfahan University of Technology, Isfahan, I.R. Iran
4Scientific member, Research Center for Agriculture and Natural Resources of Isfahan, Isfahan, I.R. Iran
(Received: 9 January 2010, Accepted: 20 September 2010)
Abstract
Our planet is threatened by nuclear wars, climate change and degradation of biodiversity. The first two dangers are relatively focused on, but biodiversity degradation is not properly considered yet.
Species diversity is mostly composed of biodiversity and is considered an index of changes in ecosystems. Many of researchers think of higher species diversity as an index of bio-system’s stability.
This research aimed to study parametric models of species diversity on range vegetations of study sites and relationship of ecological factors such as climate, soil and topography with diversity index. Four range sites were selected on different geographic areas in Isfahan province and randomly- systematic sampling was conducted to collect density data on plant species by quadrates along transects of each site during six years (2002-2007). Broken stick, log normal, logarithmic series and geometric series models were fitted for each site, and log normal showed to be the most proper model of distribution with P>0.05. LSD’s test indicated a significant different at α=1% level between species diversity of steppe1 and semi-steppe2 sites. Log normal model seemed to be the most proper model in all sites.
Generally, when this model is fitted successfully communities are considered stable. On the basis of some related studies with this research, Hill (N1) showed to be most proper index for species diversity in study sites, therefore effects of ecological factors such as soil, climate and topography on this index were studied by CCA method. Results of CCA revealed a high positive correlation between species diversity and percent organic matters of soil as well as precipitation levels and negative correlation with temperature.
Keywords: Species diversity, Species abundance model, Canonical correspondence analysis
*Corresponding author: Tel: +98 913 2111977 , Fax: +98 311 3912841 , E-mail: [email protected] 1- Artemisia sieberi community
2-Rangeland's communities of Zagross mountains
