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SPATIAL DISTRIBUTION OF THE INVASIVE ALIEN PLANT Ailanthus altissima (Mill.) Swingle IN THE TOWNS OF ZAGREB COUNTY D. Vlahović1, D. Hruševar2, F. Varga3, D. Vladović4, B. Mitić2 1 Primary School Bogumila Tonija, Ivana Perkovca 90, 10430 Samobor, Croatia (dianavlahov@gmail.com) 2 University of Zagreb, Faculty of Science, Department of Biology, Marulićev trg 9a, 10000 Zagreb, Croatia (dario.hrusevar@biol.pmf.hr ; bozena.mitic@biol.pmf.hr) 3 University of Zagreb, Faculty of Agriculture, Department of Seed Science and Technology, Svetošimunska 25, 10000 Zagreb, Croatia (fvarga@agr.hr) 4 Nature History Museum Split, Poljana kneza Trpimira 3, 21000, Split, Croatia (dalibor@prirodoslovni.hr) The County of Zagreb consists of rural, urban and forest areas, which are extremely affected by invasive alien species, and hence their mapping has begun in 2012. An especially frequent invasive woody species in the area is Ailanthus altissima, for which the preliminary research of spatial distribution in all nine towns of the Zagreb County was performed during the year 2012. Altogether, 541 plots of 250x250 m2 were investigated, and A. altissima was found in all towns, in total on 84 plots (15.5%). In Ivanić Grad, the species was established on 9 of 73 surveyed plots (12.3%), in Jastrebarsko on 10 of 48 plots (20.8%), in Sveti Ivan Zelina on 4 of 44 plots (9.1%), in Sveta Nedjelja on 2 of 31 plots (6.5%), in Velika Gorica on 18 of 76 plots (23.7%), in Vrbovec on 5 of 48 plots (10.4%), in Zaprešić on 7 of 58 plots (12.1%), in Dugo Selo on 5 of 54 plots (9.3%), and in Samobor on 24 of 109 surveyed plots (22.0%). The repeated research in 2016 in Dugo Selo and Samobor showed that the number of new plots with A. altissima has increased by 22.2% in Dugo Selo, and by 39.4% in Samobor, and the increase was more significant in urban parts of the towns. The research has pointed to the need for more intensive and constant monitoring of A. altissima distribution in order to control its further spread within and outside the Zagreb County. Key words: mapping of invasive alien species, northwest Croatia, tree of heaven, urban areas |
