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The aim of the study is to analyse the size and efficiency of assimilation apparatus of Scots pine (Pinus sylvestis L.) using the site index model for unthinned pine stands (Model Pinus). The size of the assimilation apparatus was regarded in terms of mass of the twigs covered with needles (Ugc) and mass of needles (Ic). It reaches maximum values at the age of 20−25 years, then dynamically decreases...
Productivity of the assimilating apparatus is commonly defined as an increment in volume, most typically of the stem or trunk, per unit of crown size. In this paper the productivity of the assimilating organ (CPtwn1) is calculated as a quotient of the average annual increment in stem volume from a 5−year period (i v1) and the volume of twigs with needles (twnv), determined by xylometry methods (fluid...
The paper presents variability in morphological traits of trees in mature Scots pine stands exposed to wind. The analysed parameters included breast height diameter, tree height and length, diameter, lateral area and crown base area. Except for the crown base area and crown diameter, values of the other traits increased with an increase in the distance from the edge of the stand. Crown diameter in...
The study compares height growth of pedunculate oak (Quercus robur L.) undergrowth in Scots pine (Pinus sylvestris L.) stands and in open canopy conditions. Material was collected in 20 Scots pine stands with well−developed pedunculate oak undergrowth located in north−eastern Poland, representing the mixed deciduous forest type (Querco roboris−Pinetum). Fraction of oak undergrowth with slow height...
The paper presents the results of the second inventory following the removal of a poor−quality old−growth pine stand relating to the biosocial structure, breast height diameter and height of fir trees planted in two experimental variants (rows and groups) that already have reached 50 years of age.
The aim of the study was to determine the effect of selected tree stability indices described by individual biometric characteristics on the formation of their wind resistance. The analysis of tree stability was based on easily measurable tree traits, such as height, breast height diameter, crown parameters as well as the centre of gravity and slenderness factor. Investigations were conducted in wind−damaged...
The paper presents an analysis of merchantable timber volume in three Scots pine stands aged 35, 50 and 88 years depending on Kraft's classes. It also shows the strength of the relationship between this volume and various measures of a tree's growth space (crown projection area, crown width, Seebach's growth space number, crown projection area ratio, space of a single tree and crown spread), crown...
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