عنوان مقاله [English]
Development and rehabilitation are two major factors in the Comprehensive Project of Caspian Forest Conservation of Iran which can be reached by standard seedlings production. Due to importance of these forests, productive afforestation and subsequently seedling production at nurseries in respect to tree species and their quantitative and qualitative characteristics, have a special value in that project. The data related to seedling production at 21 nurseries located at Caspian Region of Iran for five year period (1998- 2001) were recorded and analyzed. The results showed that 57 species were produced in the nurseries, including 31 hardwood and 26 soft wood species and total seedling production was about 30 m/year. From the 31 hardwood species, the proportions of natives and exotics were 95% and 5%, respectively, whereas the proportions for the softwood species were 84% and 16%, respectively. Four of the native hardwood species, including Acer velutinum, Alnus subcordata, Fraxinus excelsior and Quercus castaneifolia which have high quality industrial woods, covered more than 50% of the total nurseries seedling production, from which A. velutinum and A. subcordata covered the highest proportion of these four species. Based on economical evaluation of the species wood values, A. velutinum gained the highest value and the other three species achieved the second rank.