Tuyển tập những bài báo cáo nghiên cứu khoa học hay nhất được đăng trên tạp chí JOURNAL OF FOREST SCIENCE đề tài: Study of natural hybridization between Alnus incana (L.) Moench. and Alnus glutinosa (L.) Gaertn. | JOURNAL OF FOREST SCIENCE 53 2007 2 66-73 Study of natural hybridization between Alnus incana L. Moench. and Alnus glutinosa L. Gaertn. E. V. Banaev1 V. Bazant2 1Central Siberian Botanical Garden SB RAS Novosibirsk Russia Faculty of Forestry and Environment Czech University of Life Sciences in Prague Prague Czech Republic ABSTRACT Variation of metric and qualitative characteristics of A. incana L. Moench. and A. glutinosa L. Gaertn. has been studied in 10 natural populations in West Siberia Russia and the Czech Republic in connection with the problem of natural hybridization. Morphological peculiarities of the species and their spontaneous hybrids are shown. Twelve leaf characteristics were used in addition qualitative characteristics were assessed such as type of bark degree of pubescence of leaves and stems and presence of a tuft in the angles of leaf veins. The reasons for hybridization of these species are discussed. Keywords Alnus Mill. natural hybridization variation population Natural hybridization of woody plants has been the objective of research of the specialists all over the world. This phenomenon is typical of a range of genera and study of it allows to solve a great number of theoretical and practical problems. There are enough data on existence of interspecific hybrids in the genus Alnus Mill. . Hybrids between different species of alder are indicated for North America Europe the Russian Far East and Japan Hylander 1957 Mizushima 1957 Steele 1961 Furlow 1979a b Bobrov 1980 Bousguet et al. 1989 and others . Natural hybrids between A. incana and A. glu-tinosa are known in Belarus Latvia Poland the Czech Republic Sweden Ireland and some other countries. They possess many economically valuable properties. They are characterized by greater drought resistance compared to parent species less demand for fertility Kobendza 1956 Kundzinsh 1957 heterosis high physical-technical properties of wood Pirags 1962 and heightened resistance to pythium rot Per .
