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عنوان
پیشنویس مقاله چاپ شده ثبت شده در 1397/01/21 3:37:0 ب.ظ
نوع پژوهش مقاله چاپ شده
کلیدواژه‌ها
Roadside habitats, Rangelands, Chorotypes, Irano–Turanian region, Response curv
چکیده
Exploring the phytogeographical distribution of roadside flora in natural areas provides several orig-inal insights into plant dispersal. The roadside flora of the Irano–Turanian rangelands was studied inthe northeast of Iran, along about 600 km of asphalt road. Sampling was performed in homogenousphysiognomic-physiographic units along the altitudinal gradient from the plain to the mountainousareas. In a stratified random design, 38 sites on 12 asphalt roads were sampled, and 330 plant taxa ofdifferent chorotypes were identified. The altitudinal distribution of the chorotypes was examined fittinggeneralized linear models (GLM) and generalized additive models (GAM). The results showed that nativeuni-regional taxa (Irano–Turanian elements) were the dominant chorotype of the roadside habitats inthe rangeland areas. The altitudinal response curve of multi-regional (bi-regional to quadri-regional)chorotypes reflected climatic conditions in their contributing phytochoria. Quadri-regional taxa, with anoptimum of the Gaussian response curve at mid-altitudes, reflected a moderate climate. The proportion ofendemic species (3.6%) was high compared to the pluri-regional (4.6%) and the cosmopolitan taxa (1.2%).While the pluri-regional taxa increased with altitude, cosmopolitan species decreased monotonically andwere absent from the high altitudes. This study revealed the importance of the mid-altitude roadsides,both as a refuge for local endemic species and as a bed for local weeds and regional alien species.
پژوهشگران جواد پوررضایی (نفر اول)، سید جمال الدین خواجه الدین (نفر دوم)، حمیدرضا کریم زاده (نفر سوم)، محمدرضا وهابی (نفر چهارم)، ولی الله مظفریان (نفر پنجم)، مصطفی ترکش اصفهانی (نفر ششم به بعد)