WOOD RESEARCH Volume 66, Number 6, 2021
Mohammad Dahmardeh Ghalehno, Babak Nosrati Sheshkal, Farhad Kool, Miha Humar, and Mohsen Bahmani

Characterization of anatomical, morphological, physical and chemical properties of konar (ziziphus spina-christi) wood

The goal of this research is to investigate some morphological (fibre length, fibre diameter, cell wall thickness, Runkel coefficient, flexibility coefficient, slenderness coefficient, rigidity coefficient, Luce’s coefficient, solid coefficient), physical (dry wood density, volumetric shrinkage) and chemical (cellulose, hemicellulose, lignin, ash and acetone soluble extractives contents) composition of Konar (Ziziphus spina-christi) wood grown in Hormozgan province, Iran. For this purpose, three normal trees were selected randomly and a disk was cut from each one at breast height. Anatomical inspection revealed that the species was diffuse porous, with distinctive growth rings, simple preformation plate, with polygonal openings, and banded or diffuse-in aggregates parenchyma. The average values of wood dry density, fiber length, fiber diameter, cell wall thickness, Runkel coefficient, flexibility coefficient, felting coefficient, Luce’s coefficient, solid coefficient, rigidity coefficient were 0.926, 52.1, 77.85, 0.57, 163 ×103 μ3 and 0.48. Cellulose, hemicellulose, lignin, acetone soluble, extractives, ash contents were 43.34, 19.98, 33.9, 6.42 and 2.78%, resp.

WOOD RESEARCH Volume 63, Number 5, 2018
Sedigheh Saeedi, Mohsen Bahmani, Miha Humar, and Farhad Kool

Effect of tree diameter classes on the properties of persian oak (Quercus brantii Lindl.) wood

This study was conducted to investigate the properties of Persian oak (Quercus brantii Lindl.) wood, the most abundant tree species, harvested in the west and southwest regions of Iran. To the best our knowledge, there were no reported studies investigating the physical, chemical and biometrical features of Persian oak wood. For this purpose, 12 healthy trees in three diameter classes including 10-20, 20-30 and 30-40 cm were selected randomly and a disk was cut from each one at breast height. Results indicated that the highest basic densities are related to the diameter class 20-30cm (0.98 g.cm-3) and the lowest one at diameter class 10-20 cm (0.88 g.cm-3). The highest shrinkage was determined at oak wood samples from the diameter classes 10-20 cm (14.15%). Fiber length varied between 0.82 g.cm-3 (Dia. Class 10-20 cm, middle part) to 1.01 (Dia. Class 20-30 cm, bark). With increasing diameter, the cellulose content increased and the lignin content decreased while ash and extractive content was quite constant.

WOOD RESEARCH Volume 65, Number 2, 2020
Mohsen Bahmani, Leila Fathi, Gerald Koch, Farhad Kool, Hamed Aghajani, and Miha Humar

Heartwood and sapwood features of Sorbus torminalis grown in iranian forests

In the present study anatomical, histometrical, chemical and physical properties of the wood of 45-year old trees were determined. For this purpose, three trees were randomly cut at Sangdeh-Mazndaran located in the northern part of Iran. Disks and logs were removed at breast height to study the respective wood properties. Fiber length, fiber diameter, fiber lumen diameter, cell wall thickness as well as lignin and cellulose content of sapwood are superior to those of heartwood. Growth rings boundaries are fairly distinct and can be distinguished by only two to three compact fiber layers. The wood is diffuse-porous and vessels are small and predominately solitary, hardly visible to the naked eye on transverse sections. Most rays are 2-seriate interspersed with only few 3-seriate and uniseriate rays, and composed of procumbent body cells with occasional marginal rows of upright and/or square cells.