Volume 9, Issue 4 (10-2010)
Abstract
In this study, tree and shrub species that planted in the streets, parks and other landscaping of Hamedan were studied and counted. Results indicated the presence of 20 Families, 32 genera and 37 species in the studied area. From 26 tree species that was planted, 12 species were non-indigenous and others were native. Eleven shrub species were determined out of which nine were non-native and only two species were recognized as native species. From 37 species that were observed in different parts of the city, nine were native or non-native and could grow without direct effects of the man. From those, some are introduced as Neophyte species that are indicated following as bolded: Acer negundo L., Ailanthus altissima (Mill.) Swingle, Robinia pseudoacacia L., Armeniaca vulgaris Lam., Fraxinus rotundifolia Miller, Juglans regia L., Morus alba L., Ulmus minor Miller, Populus nigra L. var. pyramidalis. The presence and dispersal of indigenous and neophyte shrub species indicates that these species have potential to select some biotypes inside the city, without direct control of man for their survival (specially in segetal environments). The presence of naturalized species indicates the fact that if proper environment are selecteded for them, they are able to survive under extensive control and cost-effective conditions. In this case, it is possible to prepare appropriate and naturalized environment for the groups of animal and plants.
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Volume 11, Issue 4 (2-2012)
Abstract
Some of ruderal and segetal areas inside of Hamedan city and its suburb (in a radius of 2o km) involving some of farms, gardens, green spaces, waste lands and also margin of terrific regions (streets and superhighways) were compared based on ecological-floristically view in relation to presence and dispersal of Heliotropium genus between 2010 -2011. This genus with 74 species is introduced as one of the Boraginaceae family genus for Iran, which have many species. Heliotropium europaeum L and Heliotropium noëanum Boiss. have been already observed in inside of Hamedan city and its suburb. Extensive dispersal of H. europaeum L. species with H 4, 5, 6 hemeroby degrees as an segetal-ruderal neophyte element, in humid areas (such as gardens, left farm lands, beside roads) and also in dry regions (such as between pavings and asphalts clef, beside of walls and etc.) indicates high adaptation of this species with many ruderal biotops inside of Hamedan city and its suburb. H. noëanum Boiss. with H4 hemeroby degree, was observed limitedly and only in one urban site and also in a few number in its suburb.
