Abstract
Two experimental plantations of Euramerican poplar (Populus?euramericana (Dode) Guinier) - clone I-214 were researched on the river Sava alluvium in Srem. Three sample plots were established in each of the plantations, aged 31 years. The soil type was humofluvisol (alluvial semigley), planting space 6?6 m. The plantations were established with 278 rooted cuttings per hectare, and the number of trees at the age of 31 accounted for 46.5-60.6%. The constructed height curves, mean stand height (hg) and upper (hg20%) heights show that the study plantations were established on different site classes, which was significantly reflected on other plantation growth elements and productivity. However, there was no significant effect of site class on the variability (sd and cv) and shape of diameter structure (?3 and ?4). The constructed models of diameter structure for each site class (by Weibull function) differ by location parameter (a), and do not differ by parameter of scale (b) and shape (c). The tree and plantation growth elements show a high production potential of the clone I-214 which indicates that, on optimal soils and with the provided technological measures in the stage of nursery production and in the stage of plantation establishment, clone I-214 presents the good base for high production effects.
Highlights
site class37,8б 11,19*** 0,0004 39,0б 4,90** 0,0081 47,3б 4,92** 0,0079 57,7б 4,44* 0,0113 3,352б 3,28* 0,0306 5,133а 2,03нс 0,1126 24,59б 4.83** 0.0085
Diameters of all trees and of a number of felled trees were measured by section method, aiming at the precise estimation of plantation volume
The upper and mean heights, and the constructed height curves, show a high production potential of the plantations, and that the study plantations differ, on average for 3.0 m and 3.7 m, i.e. that they belong to different site classes
Summary
37,8б 11,19*** 0,0004 39,0б 4,90** 0,0081 47,3б 4,92** 0,0079 57,7б 4,44* 0,0113 3,352б 3,28* 0,0306 5,133а 2,03нс 0,1126 24,59б 4.83** 0.0085. Vdsk [m3·ha–1] 528,05 471,75 559,31 374,94 392,99 395,41 519,71а 387,78б 4.99** 0,0075. Vst [m3·ha–1] 594,84 533,06 620,05 447,14 472,01 473,21 582,65а 464,12б 4.36* 0,0121. На I бонитету утврђени су средњи прсни пречници (dg) у интервалу од 50,453,4 cm и доминантни пречници (dg20%) у интервалу од 60,5-63,6 cm. На II бонитету утврђени су мањи, како средњи (46,6-47,9 cm), тако и доминантни прсни пречници (57,1-58,5 cm). Већа варијабилност запремине стабала условила је да већа запремина доминантних стабала од 13,1% на бољем висинском бонитету (локалитет „Купиново“) у односу на слабији висински бонитет (локалитет „Банов брод“) није значајна (табела 2). Запреминске линије дебла са кором изравнате параболом II степена (табела 4) показују да је статистичка веза између запремине и прсних пречника висока на оба. На локалитету „Купиново” запреминска линија дебла са кором целим током се налази изнад запреминске линије
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