Effective environmental factors on distribution of plant species (Case study: Donbalid rangelands of Taleghan)

In this paper effective environmental factors on plant distribution of Taleghan rangelands has been investigated Then، sampling in each unit was done along two 150 meter transects. 15 plots (1 m2)، established along each transect in 10 meter distances. The kind and the amount of existing species and the percentage of vegetation cover were determined in each plot. At the beginning and at the end of each transect، a profile was dug and soil. Sampling was done from 0-30 centimeter. Among soil properties، clay، silt، sand، organic material، lime، pH and EC were measured. To determine the major factors affecting plant distribution variations، Principle component analysis was used. The results showed that among studied factors aspect، texture، lime، parent material had the most influence on plant distribution.