DIGITALNA ARHIVA ŠUMARSKOG LISTA
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ŠUMARSKI LIST 11-12/2010 str. 29 <-- 29 --> PDF |
M. Zebec, M. Idžojtić, I. Poljak, I. Mihaldinec: VARIJABILNOST NIZINSKOG BRIJESTA (Ulmus minor Mill. ... Šumarski list br. 11–12, CXXXIV (2010), 569-580 Trinajstić, I., 1991: Prilog poznavanju flore otoka WinFOLIA TM, 2001: Regent Instruments Inc., Quebec, Dugog, Acta Bot. Croat. 50: 121–127. Canada, version PRO 2005b. Vukelić, J., D. Baričević, 1998: Sukcesija šum-Zebec, M., 2010: Morfologija i varijabilnost nizins skih zajednica na području sušenja hrasta luž-kog brijesta (Ulmus minor Mill. sensu latissimo) njaka u Hrvatskoj, U: B. Prpić (ur.), Održivo u Hrvatskoj, Disertacija, Šumarski fakultet Za gospodarsko korištenje nizinskih rijeka i zaštita greb. prirode i okoliša, Hrvatsko šumarsko društvo Zlatarić, B., 1952: Forme nizinskog brijesta, nje- Zagreb i EURONATUR, 23–37, Zagreb. govo rasprostranjenje i šumsko-uzgojno značeVukelić, J., Đ. Rauš, 1998: Šumarska fitocenolo-nje kod nas, Manuskript, Zagreb. gija i šumske zajednice u Hrvatskoj, Šumarski fakultet Zagreb, 310 str., Zagreb. Vukelić, J., S. Mikac, D. Baričević, D. Bak šić, R. Rosavec, 2008: Šumska staništa i šumske zajednice u Hrvatskoj, Državni zavod za zaštitu prirode, 263 str., Zagreb. SUMMARY: Due to the Dutch elm disease elms (Ulmus L.) have been categorized as a threatened genus within European flora, so that the protection of their genetic resources has been set as the main goal of many multilateral European projects. Due to exceptional sensitivity to the Dutch elm disease, as well as the high variability of morphological features, special emphasis in these studies has been put on the research of morphological and genetic variability of the European field elm, as well as the delimitation of species within U. minor Mill. sensu latissimo complex. The taxonomic structure of this complex, despite very intensive research, including combining of morphometric and molecular-biological methods, still represents an unknown. In Croatia, the field elm appears in very different ecological conditions, and it is assumed that populations, especially the ones from climatically contrasting and geographically remote stands, differ from each other. Croatian Drava River valley is a place of exceptional natural value and very high biological and landscape diversity. This area is protected by law by establishing Regional Park Mura-Drava, which is a part of the future MuraDrava- Danube Biosphere Reserve. Along the Drava River banks, numeruos anthropogenic activities took place (gas and oil exploitation, hydroelectric power plants, hydroregulation by building of dams and canals, excavating of sand and gravel from river bed). These activities resulted in changes in water relations and caused tree dieback in lowland forest ecosystems, which had drastic negative impact on biodiversity of this area. As a consequence of above mentioned activities, the field elm (Ulmus minor Mill. sensu latissimo) is threatened twofold. First - by negative human impact and second – by Dutch elm disease. Therefore, in this study the variability of five field elm populations (Ulmus minor Mill. sensu latissimo) from Drava River valley, Northwest Croatia has been researched: Banov Brod, Gotalovo, Svibovica, Varaždin and Veliko Polje (Figure 1). Morphometric research of the intra- and interpopulational variability was done on the basis of 10 morphological leaf traits (Figure 2). Descriptive statistics and multivariate methods were used. It was concluded that the analysed morphological traits were very variable. The variability coefficient for populations in total varied from 17,63 % for number of primary teeth in the subapical region to 52,94 % for the leaf base asymmetry (Table 1). There were significant differences among trees within populations and among populations for all measured leaf traits (Tables 2 and 3), except for two traits |