Investigating the Environmental Factors Affecting the Plant Distribution in QezelOzan - Kosar Rangelands (Ardabil province), Iran

Document Type : Research and Full Length Article


1 Faculty of Agriculture and Natural Resources

2 Department of Range & Watershed Management, University of Mohaghegh Ardabili, Ardabil, Iran

3 University of Mohaghegh Ardabili

4 Faculty of Agriculture and Natural Resources, University of Mohaghegh Ardebil

5 Watershed Management, Forests and Rangelands Research Department, Guilan Agricultural and Natural Resources Research and Education Center, Agricultural Research, Education and Extension Organization (AREEO), Rasht, Iran


The purpose of this study was to investigating the effect of environmental factors on the plant composition and diversity in QezelOzan - Kosar rangelands of Ardabil province, Iran, in 2016. Eight sites with elevation ranging from 900 to 2100 meters above sea level were selected, and three of 100- meters transect with 10 plots of 1 m2 were established along each one. Species were collected from the plots and their vegetative forms were determined and the factors related to the frequency of species were recorded. Forbs frequency 2.1% to 33.3%, shrubs 0.4% to 29.2% and grasses 0.4% to 46.7% were determined. Along each transect, a soil sample was collected from depths of 0 to 30 cm. Then some soil properties such as pH, Electrical Conductivity, Calcium, Sodium, Potassium, Phosphorus, Nitrogen, Magnesium, Calcium Carbonate equivalent, Organic carbon and Soil texture were determined. Vegetation ordination analysis including Principal Component Analysis (PCA), Detrended Correspondence Analysis (DCA), redundancy analysis (RDA) and Canonical Correspondence Analysis (CCA) were performed in Canoco4.5 and PC-ORD5 software. Results of PCA showed organic carbon with eigenvector values of (0.42), nitrogen (0.41) and elevation (0.37) were important factors influencing the distribution of plants. CCA showed, elevation with eigenvector values of (0.37), potassium (0.35) and clay (0.44) were the most effective in forbs distribution and in grasses distribution, potassium with eigenvector values of (0.35), pH (0.58) and organic carbon (0.42) were the most important factors. RDA in shrubs distribution also showed slope with eigenvector values of (0.44), elevation (0.37) and sand percentage (0.46) were the most important factors. By doing this research, the basic knowledge of the ecological requirements in the rangelands of these areas were obtained. Thus, by the increase of technical knowledge, some activities can be done to protect and systematic exploitation as well as to restoration the degraded areas.


Main Subjects

Articles in Press, Accepted Manuscript
Available Online from 05 October 2021
  • Receive Date: 09 December 2020
  • Revise Date: 28 August 2021
  • Accept Date: 05 October 2021
  • First Publish Date: 05 October 2021