TY - JOUR T1 - Climatic Characteristics of the Natural Habitats of Astragalus gossypinus Fisher in Isfahan Province TT - بررسی ویژگی‌های اقلیمی رویشگاه‌های گونهAstragalus gossypinus Fisher (گون کتیرایی) در استان اصفهان JF - IJAE JO - IJAE VL - 5 IS - 16 UR - http://ijae.iut.ac.ir/article-1-761-en.html Y1 - 2016 SP - 13 EP - 30 KW - Astragalus gossypinus KW - Climatic variables KW - Factor analysis KW - Habitats of Isfahan province. N2 - The relationship between plant species and climatic factors has always been an important subject in plant ecology and the use of multivariate statistical methods might be effective in detecting the relationship between climatic factors and the distribution of plant species. In the present study, climatic characteristics of Astragalus gossypinus Fisher producing tragacanth stretched in a relatively vast area in Isfahan province (approximatley seven percent of natural habitat of Isfahan province) to shed lights on determinant climatic factors on distribution of this species were investigated. In this study, 56 climatic variables were evaluated in the months of January, March, and July in the annual interval and to reduce the number of variables and determine the most important factors. Factor analysis was applied using principal components analysis. The results showed that four factors, namely cooling temperature-humidity, precipitation-storm, cloudiness, and windiness account for 39.05%, 32.77%, 11.44%, and 8.63%, and totally 91.88% of the variance of the data, respectively. Also, the cooling temperature-humidity factor has the greatest impact on presence of this species, therefor, in areas where this species can be seen, the cooling temperature-humidity factor is positive and vice versa. M3 10.18869/acadpub.ijae.5.16.13 ER -