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ŠUMARSKI LIST 5-6/2015 str. 31     <-- 31 -->        PDF

VARIABILITY OF BLACK POPLAR (Populus nigra L.) LEAF MORPHOLOGY IN VOJVODINA, SERBIA
MORFOLOŠKA VARIJABILNOST LISTOVA CRNE TOPOLE (Populus nigra L.) NA PODRUČJU VOJVODINE, SRBIJA
Dijana Čortan,Bojan Tubić, Mirjana Šijačić-Nikolić, Dragan Borota
Summary
Morphological study of intra and interpopulation variability of black poplar leaves was carried on four natural populations located in the basin of the major rivers at the area of Vojvodina, Serbia. Research was conducted on the basis of nine leaf morphometric parameters, with descriptive and multivariate statistical analysis. Results show that within and between studied populations exists considerable variability, with the variability much more pronounced within than between populations. Given that the environmental conditions of investigated locations are uniform, it is assumed that the variability is consequences of the specific gene pool of these populations.
Key words: Black poplar, Vojvodina, leaf morphology, interpopulation and intrapopulation variability
Introduction
Uvod
Area of Vojvodina, Serbia, is one of the regions with lowest forest cover in Europe, less than 6.50% of its total area. Forests of Vojvodina are unevenly distributed and mainly located in the narrow and wider areas along rivers, representing smaller and larger forest complexes. Since the last few decades floodplains are increasingly under human’s control, representation of flooded ecosystems in total area of Vojvodina is only 28%. Forest and other wooded land of riparian area, which are the products of mutual relations between biological and ecological characteristics of native poplars and willows and river alluvial action, have been tight between the embankment and the river. These natural habitats of native riparian species are disappearing and formation of new alluvial sediments and new pioneer stands has been significantly reduced. Within these riparian ecosystems black poplar (Populus nigra L.) as one of important pioneer tree species (Pospiškova et al. 2004) has been adapted to the specific conditions of floodplain.
Until now, smaller and larger areas of a poplar-willow forest are preserved in groups and as single trees. In the river valleys, where the river is still wild, black poplar is better preserved than on the rivers which are more regulated. Today, black poplar participate with only 15,87% in total area of native poplars, which is 8,45% of all poplars area (other 91,54% belongs to hybrid poplars) (Radosavljević 2009). Given that black poplar suffers from tremendous habitat losses, it has been considered as endangered tree species of riparian ecosystem.