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Title

THE MOST IMPORTANT ENVIRONMENTAL EFFECTIVE FACTORS ON DOREMA AUCHERI BOISS. DISPERSION IN RANGELANDS LORESTAN PROVINCE

Pages

 Start Page 83 | End Page 96

Abstract

 The aim of present the study was assessing the relationship between Dorema aucheri dispersion. At first, 60 sites were selected in Delfan County. In each site 3 transects with 100 m length and 10 4-square meter along transects was established and canopy cover and species density then studied. Then at the first, mid and end of transect, soil samples were collected in 0-30 cm depth. Height, slope, aspect and some soil properties, including texture, electrical conductivity, acidity, organic matter, phosphorus, potassium and nitrate were determined. CLUSTER ANALYSIS, independent t test, DISCRIMINANT FUNCTION and principle component analysis were used for analyzing the data. The results of CLUSTER ANALYSIS indicated that the sites were separated into two main groups. Also the results showed that studied species have the most presence in height of 2345 m, at the slope more than 80 percent, southwestern and western aspect, temperature more than 10 degrees, precipitation 498 mm, soils with 1.63 percent organic matter, and less sand, and more silt and clay. The results of DISCRIMINANT FUNCTION and principle component analysis indicated that at the first level height, precipitation, temperature and some soil parameters like sand, silt and organic matter and at the second level aspect and other soil characteristics like pH and potassium are effective in the studies species dispersion. According the results of the present study, this fact is documentable that the studied species is suitable for restoration in rangeland.

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