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This paper shows correlations between vessel characteristics and differences   in growth-ring width in heartwood and sapwood. Analyzed samples were from an   iron-wood tree (Gymnocladus canadensis Lam.) that grew in the Mužljanski Rit   area, of the Srpska Crnja municipality in Serbia. According to previous   research, it was deduced that Gymnocladus canadensis Lam. belongs to   ring-porous species with big vessel lumen in the earlywood zone and thicker   cell walls in the latewood. Vessels were more numerous in the latewood zone,   and the same was true for heartwood and sapwood. For both layers, sapwood   possessed a few more vessels than heartwood, and a statistically significant   difference was confirmed by t-test during the early phase. The greatest   negative value of correlation coefficient was between the number of vessels   and growth-ring width during the early phase for sapwood. The number of   vessels decreased in the wider growth rings. The correlation between   growth-ring width and the area of vessels had a statistically significant   positive value of correlative coefficient, which means that wider growth   rings had larger vessel areas in the early phase for sapwood. [Projekat   Ministarstva nauke Republike Srbije, br. 31041

Correlations between the anatomical traits of Gymnocladus canadensis Lam. in heartwood and sapwood of early- and latewood zones of growth rings