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Warsaw, Poland

Variation of wood strength coefficients was determined for the silver birch trees coming from north-eastern Poland which is the main source of raw material of this species. Samples were taken for measurement from twelve sample plots with trees at the age of 45 and 70 years growing in the fresh forest habitat. Strength coefficients were subjected to statistical analysis for compression parallel to grain, static bending, tensile strength parallel to grain and the modulus of elasticity in static bending. The research confirmed a significant effect of the location and age of trees on the mean values of coefficients of compression strength and modulus of elasticity in static bending. Moreover, a significant influence of location on the mean values of coefficients of tensile strengrh parallel ro grain and static bending strength without the effect of tree age on these coefficients was found. Also a simultaneous influence of the location and age of trees on the mean values of all studied coefficients was demonstrated. Source


Paper presents the methodological assumptions of assessment of the attractiveness of the forest landscape in the vicinity of the municipal road Kup - Radomierowice (SW Poland). Landscape attractiveness was determined by the means of diversity of landscape units expressed by quotient of the sum of structural and stand units and the length of the landscape unit. The results allow determining the possibilities of landscape formation along the roads. Decisions about shaping of the road vicinity should be based not on the assessing the visual attractiveness of the landscape, but rather on detailed analysis of scenic variables and especially spatial relationships that occur among them. Source


The results presented in the article are a part of the research project on the variation in pure density of pine material in Poland. The aim of this work was to examine the variability in pure density of Scots pine wood along the trunk height depending on the type of the forest site, age range and geographic area of forest stand. The tests were carried out in four forest regions of Poland: Knyszyn, llawa, Tuchola and Zielona Góra. One model tree was cut down in each region, in live forest stands, in site of fresh forest of II, III, IV and V age range and fresh mixed forest of III age range. Twenty trees were collected in this way. The samples in a torm of wood slices were taken from tree trunks, every one meter. After being debarked and roughly polished, the3-4 cm high samples were used to determine pure density of wood in the intire trunk cross section. It was found that the pure density tested along the total trunk length ol model trees in all the regions, torest site types and age ranges was strongly correlated with a position on the trunk. Along with the growing height, the pure density was decreasing. In over 50% of cases lower wood density was found at saw cut than at the height of one meter. I was found that the pure density grows with age. In Knyszyn, Itawa and Tuchola in the III age range in the site ol Iresh forest, the pure density ol Scots pine wood reached higher values than in fresh mixed torest, excluding Zielona Góra forest, where the tendency was reverse. Source


Development of innovative solutions in forestry requires also that students of forestry would understand in greater extend the complex system of changes in the environment and the way the man controls these changes. It is also another challenge (innovation?) for the forest education at all levels. At the level of university education, forestry in the first half of the XXI century needs to find appropriate proposals for the methods and techniques of training, involving not only the transition from 'teaching' to 'learning'. To evaluate the level and depth of knowledge, and above all, the ability to solve problems is also the task of the future employer. These require both a corresponding adjustment of ongoing educational programs and curricula or creation of a completely new approach, which will be also accompanied by new methods of checking the effectiveness of the applied solutions. Source


Paper presents analysis of differences in conventional wood density of Scots pine measured at breast height regarding the geographical location of stands, forest habitat type, stand age and associated parameters such as density in the mid-length of the stem, density in the upper end of the stem and diameter at breast height. To investigate the impact of these factors, an analysis of covariance was used in accordance with two models specifically developed for this purpose. We found dependence of conventional wood density on the type of forest habitat and geographical location of the stand. The highest density was detected in dry coniferous forests, while the smallest in fresh mixed coniferous forests. Scots pine wood from Zielona Góra Forest (western Poland) characterised with the highest density, while from the Knyszyn Primeval Forest (eastern Poland)-with the lowest. Source

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