Document Type: Research Paper
Department of Plant Protection, Yazd Branch, Islamic Azad University, Yazd, Iran
Faculty of Natural Resources, University of Tehran, Karaj, Iran
Department of Forestry, Science and Research Branch, Islamic Azad University, Tehran, Iran
Agricultural and Natural Resources Research Center, Yazd, Iran
College of Agriculture and Natural Resources, University of Tehran, Karaj, Iran
The purpose of this study was to evaluate the species-environment relationships in arid and semi-arid rangelands
of Nodushan, Yazd. The plant species cover and the environmental variables were measured at 9 sites. Soil samples
were taken for measurement of 12 attributes in 0-10 cm and 10-80 cm layers. Vegetation was classified using twoway
indicator species analysis (TWINSPAN). Data was analyzed using the ordination method of canonical
correspondence analysis (CCA). Results showed that soil texture, organic matter, gypsum, salinity, C/N ratio, and
elevation greatly affected the distribution of vegetation. Anabasis aphylla reflected the high salinity and saturation
moisture content of soils. Ephedra strobilacea reflected a high level of soil gypsum and a high C/N ratio. Artemisia
aucheri was characterized by a gradient of increasing elevation, high organic matter, and available water.
Determining the vegetation-environment relationships at these sites facilitates the improvement and reclamation of
arid and semi-arid shrubland ecosystems.