University of Isfahan Taxonomy and Biosystematics 3115-9001 10 37 2018 12 22 Changes in Pattern Life-forms Distribution along an Elevational Gradient of Moghan-Sabalan Rangelands of Ardabil Province تغییرات الگوی توزیع اشکال زیستی گیاهان در امتداد گرادیان ارتفاعی مراتع مغان - سبلان استان اردبیل 47 78 24504 10.22108/tbj.2019.117470.1091 EN Sahar Ghafari Ph. D. Graduated of Rangeland Science, Faculty of Agriculture and Natural Resources, University of Mohaghegh Ardabili, Ardabil, Iran Ardavan Ghorbani Associate Professor, Faculty of Agricultural and Natural Resources, University of Mohaghegh Ardabili, Ardabil, Iran Mahdi Moameri Assistant Professor, Faculty of Agricultural and Natural Resources, University of Mohaghegh Ardabili, Ardabil, Iran 0000-0003-2917-4736 Raoof Mostafazadeh Assistant Professor, Faculty of Agricultural and Natural Resources, University of Mohaghegh Ardabili, Ardabil, Iran Mahmood Bidar Lord 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 Azad Kakehmami Ph. D. Student of Rangeland Science, Faculty of Agricultural and Natural Resources, University of Mohaghegh Ardabili, Ardabil, Iran Journal Article 2019 06 04 <strong>Abstract</strong> <br />This study evaluated the distribution pattern of various life-form spectra along the Moghan-Sabalan rangelands, Ardabil province, Iran. Sampling was conducted in eleven elevation classes at 300 m elevation intervals (100-3300 meters above sea level, masl). In each elevation interval, 30 quadrats (1×1 m) were used to collect vegetation data (density, frequency and canopy cover). To detect significant differences along elevational gradient, an analysis of variance (ANOVA) and Duncan test were used to compare averages and grouping of the plant index. Regression analyses were employed to explore the inter-relationship of elevation with various life-form spectra. Overall, 386 species, which comprised 44 families and 200 genera, were identified in the study area. Therophytes and hemicryptophytes were the most frequent life form constituted each with respectively 164 and 162 species, while phanerophytes with 3 species were the least frequent form of life. Density, canopy cover, IVI, species richness and diversity of therophytes decreased with elevation, while hemicryptophytes species richness and evenness increased. https://tbj.ui.ac.ir/article_24504_bc8c6dc69136816cea09d6a275ef35ee.pdf