Автор: Elias Voulgaridis

Статии

QUANTITATIVE AND QUALITATIVE WOOD PRODUCTION OF FIR (ABIES BORISII-REGIS MATTF.) IN DIFFERENT SITE QUALITIES

Автори: Dimitrios Koutsianitis, Elias Voulgaridis

Резюме

Of the numerous environmental factors affecting tree growth, the relationship between site quality and tree growth seems to be the most important. In this work, the production of fir wood (Abies borisii-regis Mattf.) on quantitative and qualitative basis was investigated in relation to three different site qualities (II, III, IV) at the University forest of Pertouli-Trikala, Greece. For the grading of round timber produced from 268 fir trees, the EN 1927-1:2008 CEN standard was employed. The results showed that the site quality has an influence on both quantitative and qualitative production of fir wood. Higher production and better quality of fir wood were found to be produced in the site quality II, while in the site quality IV, the quantity and quality of wood produced were less and inferior, respectively. In the site quality III, the production and quality of fir wood were at intermediate level.

Ключови думи: fir, wood production, quality of wood, site quality

EN Version

STRUCTURE AND PROPERTIES OF FIR (ABIES BORISII – REGIS MATTF.) AND SPRUCE (PICEA EXCELSA LINK) AND THEIR INFLUENCE ON WOΟD IMPREGNABILITY

Автори: Elias Voulgaridis, Генка Блъскова, Costas Passialis

Резюме

Spruce and fir wood is important for Greek and Bulgarian forestry and wood industry. Durability of spruce and fir mature heartwood is low and both species are refractory to impregnation - spruce wood is poorly or not permeable, while fir wood is poorly to moderately permeable. The low permeability and the resistance of fir and spruce wood to impregnation are attributed to its specific anatomical – characteristics and properties. This work presents the structural characteristics and properties, summarises those anatomical characteristics which are related to impregnation processes and looks for new methods to improve fir and spruce wood permeability. Surface drilling of wood by laser beams might improve their permeability to preservatives and widen the uses of fir and spruce in exterior conditions.

Ключови думи: spruce, fir, wood structure, wood properties, permeability

EN Version

QUALITY GRADING OF WOODEN POLES PRODUCED BY SCOTS PINE (PINUS SYLVESTRIS L.) FORESTS IN WEST RODOPI (N. GREECE)

Автори: Dimitrios Koutsianitis, Elias Voulgaridis

Резюме

Trunks of Scots pine (Pinus sylvestris L.) are widely used for poles in power transmission and telecommunication lines. The objective of this work was to apply visual quality indexes on wooden poles, based on basic wood defects. Poles were characterized according to various defects and geometric characteristics, namely: knots, spiral grain, sweep, taper, rate of growth and dimensions. Poles that did not meet the established minimum requirements of the standards applied by the public power corporation, were rejected. The results showed that from the 82 trees investigated a high percentage (90.2%) met the standards and were suitable as power transmission poles.

Ключови думи: Scots pine, poles, defects, visual grading

EN Version