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In this paper, the variability of morphological (stem height, stem basal diameter, proportion of pith, wood and bark) and wood anatomical characteristics (fiber length, fiber diameter, fiber lumen diamater, double cell-wall thickness, vessel diameter, wood rays width and height) of three Salix alba clones (B-44, 347 and NS 73/6) and one Salix viminalis clone both in the control plot and in the site contaminated with a mixture of heavy metals (As, Cd, Cr, Cu, Ni, Pb) was investigated. The observed results showed that individuals of all four clones had significantly higher average values of stem height and stem basal diameter at the control plot compared to the polluted site. As for the proportion of pith, bark and wood, heavy metals caused an increase in the share of pith and a decrease in the share of bark and wood in all clones with the exception of clone NS 73/6. The analysis of wood fiber dimensions showed that the values of all parameters were higher at the control site with the exception of fiber lumen diameter where higher values were observed for clones B-44 and NS 73/6 at the polluted site. Higher values of vessel diameter were recorded for all clones at the control plot, while wood rays width of all individuals was greater at the contaminated site. Regarding the wood rays height, only Salix viminalis showed higher value at the polluted site. These results confirmed that pollution-induced heavy metal stress significantly altered the morphological and wood anatomical characteristics of all researched clones and that it may affect their utility properties.

Anatomical properties of pedunculate oak (Quercus robur L.) wood have not been previously investigated in Serbia, so bearing in mind economic-productive and ecological significance of this species, it was one of the main reasons why this research was conducted. In this paper, fibre length (FL), double cell-wall thickness (DCWT) and fibre lumen diameter (FLD) were measured in pedunculate oak wood from two different sites. The study was conducted at two sites (Donji Srem – MU „Raškovica-Smogvica” and Gornji Srem – MU „Kupinske grede”), situated along the Sava River and characterised by different ecological conditions, including flooding regimes. Measurements were conducted in radial direction, from pith to bark, in order to assess variation of investigated characteristics with cambial age, between two sites and between individual trees within each site. All measured characteristics from both sites increase going from pith to bark apart from FL in the area of Donji Srem – MU „Kupinske grede” that reaches maximum value in the central part of xylem and then decreases. Hydrological site conditions affect the dimensions of pedunculate oak wood fibres and these values are a bit higher in Gornji Srem – MU „Raškovica-Smogvica”, due to a greater quantity of available water., Anatomska svojstva drva hrasta lužnjaka (Quercus robur L.) do sada nisu istraživana na području Srbije, a imajući na umu golemo značenje te vrste u ekonomsko-proizvodnome i ekološkom smislu, to je bio jedan od glavnih razloga za provedbu ovog istraživanja. U radu je izmjerena duljina vlakanaca (DV), dvostruka debljina stijenki (DDS) i promjer lumena vlakanaca (PLV) drva hrasta lužnjaka s dva različita staništa. Istraživanje je provedeno na staništima Gornji Srem – GJ „Raškovica-Smogvica” i Donji Srem – GJ „Kupinske grede”, koja se prostiru duž rijeke Save, a karakteriziraju ih različiti ekološki uvjeti, uključujući i režim plavljenja. Mjerenja su provedena u radijalnom smjeru, od srčike prema kori, kako bi se utvrdile varijacije istraživanih svojstava ovisno o starosti kambija, o različitosti dvaju lokaliteta te o razlikama među stablima unutar istog lokaliteta. Utvrđeno je da se sve izmjerene vrijednosti drva s oba lokaliteta povećavaju u smjeru od srčike prema kori, osim DV-a na području Donjeg Srema – GJ „Kupinske grede”, koji maksimalnu vrijednost dosežu u središnjem dijelu ksilema i potom se smanjuju. Hidrološki uvjeti staništa uvelike utječu na dimenzije drvnih vlakanaca hrasta lužnjaka i te su vrijednosti zbog veće količine raspoložive vode nešto veće u Gornjem Sremu, u GJ „Raškovica-Smogvica”.