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Farajollahi, A., Zare Chahouki, M., Azarnivand, H., Yari, R., Gholinejad, B. (2012). The effects of environmental factors on distribution of plant communities in rangelands of Bijar protected region. , 19(1), 108-119. doi: 10.22092/ijrdr.2012.103073
Asghar Farajollahi; Mohammad ali Zare Chahouki; Hosein Azarnivand; Reza Yari; BahraM Gholinejad. "The effects of environmental factors on distribution of plant communities in rangelands of Bijar protected region". , 19, 1, 2012, 108-119. doi: 10.22092/ijrdr.2012.103073
Farajollahi, A., Zare Chahouki, M., Azarnivand, H., Yari, R., Gholinejad, B. (2012). 'The effects of environmental factors on distribution of plant communities in rangelands of Bijar protected region', , 19(1), pp. 108-119. doi: 10.22092/ijrdr.2012.103073
Farajollahi, A., Zare Chahouki, M., Azarnivand, H., Yari, R., Gholinejad, B. The effects of environmental factors on distribution of plant communities in rangelands of Bijar protected region. , 2012; 19(1): 108-119. doi: 10.22092/ijrdr.2012.103073

The effects of environmental factors on distribution of plant communities in rangelands of Bijar protected region

تحقیقات مرتع و بیابان ایران
Article 9, Volume 19, Issue 1, June 2012, Pages 108-119    PDF (447.76 K)
Document Type: Research Paper
DOI: 10.22092/ijrdr.2012.103073
Authors
Asghar Farajollahi* ; Mohammad ali Zare Chahouki; Hosein Azarnivand; Reza Yari; BahraM Gholinejad
Abstract
In this study, the relationship between environmental factors and distribution of plant communities in rangelands of Bijar protected region was investigated. Vegetation types were determined by using physiononmy method. Plot size was determined with minimal area method and after primary sampling the number of plots was determined by statistical method. In each vegetation type, sampling was done along four transects of 300 m length. 15 plots of 1m2 were established along each transect at 20 meter intervals. The type and the amount of existing species and the percentage of vegetation cover were determined in each plot. In each community, 6 profiles were dug within sampling unit. Soil samples were taken from 0-20 and 20-100 cm according to the boundary of separated horizons and type of existing plant species in study area. physiographic features including altitude, slope and aspect were measured and among soil properties, clay, silt, sand, lime, pH, EC, organic mater and gravel were measured. After collecting data, the Principal Component Analysis (PCA) was used to determine relationship between vegetation cover and environmental factors by PC-ORD software. The results indicated that there were relationships between measured factors and distribution of vegetation. Texture, gravel, lime, altitude and slope had the most influence on distribution of plant communities.
 
Keywords
environmental factors; Principal component analysis; Plant community; Rangelands of Bijar
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