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Ecopersia، جلد ۱۰، شماره ۴، صفحات ۲۸۵-۲۹۵
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عنوان انگلیسی Effects of topographic variables on plant species diversity in rangelands of Hir County, Ardabil Province, Iran
چکیده انگلیسی مقاله Aim This study was conducted to investigate the association between plant species diversity indices with topographic variables in the rangelands of Hir county, Ardabil Province, Iran. Materials & Methods Random-systematic sampling was performed in three elevation profiles at 11 sites. The elevation was divided into five classes, slope into three classes, and aspect into four classes. Indices of plant species richness, Margalef's, Menhinick's, Hill evenness, density, and dominance were calculated. Indices in different classes of topographic variables were analyzed using one-way analysis of variance (ANOVA) and Duncan's mean comparison. Findings Results showed that the highest value of the Shannon-Wiener indices was observed in the elevation class of 1800-2000 meters above sea level (masl). The highest values of plant species evenness, richness, and diversity of Simpson's and Shannon-Wiener were related to the slope of 0-20%. The values of species richness indices and dominance in the southwest direction, and Menhinick's richness in the northwest direction, were higher than the other directions. At the level of Plant Functional Types (PFTs), the highest amount of evenness is at the grasses PFT and elevation classes of 1800-2000 and 2400-2600 masl. The maximum amount of Hill evenness at the shrub PFT and slope of 40-60%. The highest amount of Margalef's richness and Shannon-Wiener plant diversity was in the forbs PFT and in the southwest direction. Conclusion According to the results, elevation, and slope have the greatest effect and the aspects of the slope have the least effect on the diversity of plant species in the region.  
کلیدواژه‌های انگلیسی مقاله Elevation gradient,Physiographic factors,Plant functional types,Richness,Uniformity.
نویسندگان مقاله | Ardavan Ghorbani
Department of Range and Watershed Management, Faculty of Agriculture and Natural Resources, University of Mohaghegh Ardabili, Ardabil, Iran


| Nooshin Porghorban
Department of Range and Watershed Management, Faculty of Agriculture and Natural Resources, University of Mohaghegh Ardabili, Ardabil, Iran


| Mehdi Moameri
Department of Plant Sciences and Medicinal Plants, Faculty of Meshginshar Agriculture, University of Mohaghegh Ardabili, Ardabil, Iran


| Sahar Ghafari
Department of Range and Watershed Management, Faculty of Agriculture and Natural Resources, University of Mohaghegh Ardabili, Ardabil, Iran


| mohamad bidar lord
Forests and Rangelands Research Department, Guilan Agricultural and Natural Resources Research and Education Center, Agricultural Research, Education and Extension Organization (AREEO), Rasht, Iran


| MirMilad Taheri Niari
Department of Range and Watershed Management, Faculty of Agriculture and Natural Resources, University of Mohaghegh Ardabili, Ardabil, Iran
نشانی اینترنتی http://ecopersia.modares.ac.ir/browse.php?a_code=A-10-42820-3&slc_lang=en&sid=24
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