| Pak. J. Bot., 36(1): 41-64, 2004. | Back to Contents | ||||
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Updated: 09-07-09 | ||||
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ECOLOGICAL FACTORS AFFECTING PARTS OF VEGETATION IN NORTH IRAN (ELIKA AND DUNA WATERSHEDS) BY EMPLOYING ECO-PHYTOSOCIOLOGICAL METHOD HASSAN NAZARIAN, AHMAD GHAHREMAN1, MORTEZA ATRI AND MOSTAFA ASSADI2
Abstract: To determine ecological factors that
affect vegetation of north Iran, the eco-phytosociological method with
emphasis on physiognomic-floristic-ecologic criteria have been employed
and the existing endogenous milieus were identified. In next stage, the
placements of releves in any endogenous milieus were determined at
random. The minimal area in each releve was determined on area-species
method. The concerned floristic-ecologic data of each releve was entered
in the forms related to releves, by concerning Braun-Blanquet’s
Composition Coefficients A-D and S. The data analysis was performed by
using Anaphyto Software in F.C.A. and A.H.C. Method. After placing the
ecological factors on the multiplex coordinate axes obtained from F.C.A.
and comparing the axes together, the results were analyzed and
interpreted and the ecological factors that affect the vegetation of the
region were determined as the principal, determinant and differential
ecological factors. These results showed that the factors of soil
moisture, soil pH, OM%, OC%, slope degree and altitude from sea level of
the region were the principal ecological factors. The factors of
moisture, texture, pH, EC, OM%, OC%, percentage of the lime of soil as
well as the altitude and exposition showed to be the determinant
ecological factors. The factors of moisture, pH, EC, OM%, OC%,
percentage of the lime of soil and exposition were effective as the
differential ecological factors.
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