Assortment structure in poplar plantation Populus x euramerjcana I-214 based on European standard

Abstract

Assortment structure in poplar plantation Populus x euramericana I-214 was obtained by European standard for round wood. Based on the data of theoretical cutting, the correlation between total volume of assortments and tree diameter at breast height was established. Model of the function representing the relation between total volume of assortments of superior quality and tree diameter is reciprocal. The relation between total volumes of normal-quality assortments can be represented by a logarithm model of the function, and the relation between total volume of assortments which cannot be classified into any quality class and tree diameter is best represented by a degree model. Knots up to the height of 6 m had a significant effect on the percentage of classes of superior quality. If the lower branches were pruned from standing trees up to the height of 6 m, the percentage of this class would increase averagely by 22.07%. This shows that pruning of lower branches is a very significant plantation tending measure and that it should be performed in time. Sweep also caused the decrease of percentage of superior assortments, but not to the expected degree, because the plantation is situated along the river Sava.