Abstract
Problem statement: Plants associations differ in relation to environmental gradients. Therefore, it is necessary to study the interaction between ecological factors and vegetation. Approach: In this study vegetation and flora of Sutan-Chay Basin in Arasbaran was investigated using Braun Blanquet method as physiognomic floristic. Sampling of soil and vegetation was carried out by selecting areas with homogenous plant compositions. The surface area of releves was determined using Nested Plot method to obtain the Minimal area. Classification of releves was conducted based on the presence and cover percentage of species using cluster analysis and Jaccard index similarity. CCA was used to determine the relationship between the groups and ecological factors and the most important factors in separating the groups and distribution of the species. The classification of releves based on Jaccard’s similarity coefficient and cluster analysis showed 6 different groups. Results: Dendrogram of cluster analysis based on these methods showed six associations: Astragaleto aureus-Thymetum kotschyanus, Poeto bulbosa-Festucetum ovina, Carpinetum betulus ‘Quercetum macranthera, Paliuretum spina-christii, Juniperetum foetidissima. Canonical correspondence analysis (CCA) was used to determine the most important environmental factors on plant groups. This method of multivariate showed that pH, TNV%, soil texture, clay percentage, altitude and aspects had higher effect on separation of plant groups, which had correlation with axes 1 and 2 of ordination. Conclusion: Among the environmental factors the altitude has most important effect on plants distribution. With understanding of relationship between ecological factors and plant associations in a given area, it is possible to apply the obtained results in management and revival of forestland and rangeland.
Highlights
Variation in vegetation composition and the distribution of the species are only understandable within a community ecological framework taking into account rhyzosphere characteristics (Tansley, 1935; Waring, 1988)
Based on Correspondence Analysis (CCA) analysis of aquatic vegetation in the northeastern Nile Delta in Egypt, electrical conductivity, calcium, sodium, potassium, magnesium, total nitrogen, chlorides and bicarbonates had important effects on identifying the plants groupsand showed that the plants groups were correlated with the first and second ordination axes (Abu Ziada et al, 2008)
The main purpose of the research reported here was to investigate the relationship between environmental characteristics with plant species to determine the most important factors affecting the separation of plant associations Sutan-Chay Basin in Arasbaran, Iran
Summary
Variation in vegetation composition and the distribution of the species are only understandable within a community ecological framework taking into account rhyzosphere characteristics (Tansley, 1935; Waring, 1988). Based on CCA analysis of aquatic vegetation in the northeastern Nile Delta in Egypt, electrical conductivity, calcium, sodium, potassium, magnesium, total nitrogen, chlorides and bicarbonates had important effects on identifying the plants groupsand showed that the plants groups were correlated with the first and second ordination axes (Abu Ziada et al, 2008). CCA and partial CCA methods have been used in studying of changing plant species resulted from disturbance by human activities, environmental factors and their interactions in rain forests of Polynesian Islands (Franklin et al, 2006). The main purpose of the research reported here was to investigate the relationship between environmental characteristics with plant species to determine the most important factors affecting the separation of plant associations Sutan-Chay Basin in Arasbaran, Iran. The other objective was to determine the soil characteristics that are indicator of character species
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