Macroscopic Characteristics and Density of Scots Pine (Pinus Sylvestris L.) from Cazin, Bosnia and Herzegowina

Autor: Kličić, Hasib, Govorčin, Slavko, Sinković, Tomislav, Gurda, Safet, Sedlar, Tomislav
Jazyk: chorvatština
Rok vydání: 2011
Předmět:
Zdroj: Šumarski list
Volume 135
Issue 7-8
ISSN: 1846-9140
0373-1332
Popis: Plantažni uzgoj bijelog bora (Pinus sylvestris L.), u svijetu se primjenjuje duže vrijeme. Istraživanje makroskopskih karakteristika i gustoće plantažno uzgojenog bijelog bora (Pinus sylvestris L.) s područja Cazina u Bosni i Hercegovini, provedeno je radi stjecanja spoznaja o makroskopskim karakteristikama i gustoći tako uzgojenog bijelog bora (Pinus sylvestrisL.) Od makroskopskih karakteristika mjerena je širina goda, širina zone kasnog drva i izračunavano učešće zone kasnog drva. Određivana je gustoća u apsolutno suhom stanju i nominalna gustoća. Raspon širine goda kod istraživane borovi ne je velik, a srednjom vrijednosti za sva tri debljinska razreda zajedno od 3,6 mm. Srednje vrijednosti širine goda za svaki debljinski razred međusobno se signifikantno razlikuju. Srednja vrijednost učešća zone kasnog drva je 38,6 % za sva tri debljinska razreda zajedno. Srednje vrijednosti učešća zona kasnog drva za svaki pojedini debljinski razred se signifikantno međusobno razlikuju. Srednja vrijednost gustoće u apsolutno suhom stanju je 0,469 g/cm3 za sva tri debljinska razreda. Srednja vrijednost gustoće u apsolutno suhom stanju kod sva tri debljinska razreda se međusobno signifikantno razlikuje. Srednja vrijednost nominalne gustoće je 0,419 g/cm3, za sva tri debljinska razreda zajedno. Srednje vrijednosti nominalnih gustoća kod sva tri debljinska razreda se međusobno signifikantno razlikuju.
Plantation cultivation of Scots pine (Pinus sylvestrisL.) in the world applies a longer period of time. The study of macroscopic properties and density of plantation grown Scots pine from the area of Cazin in Bosnia and Herzegovina was carried out in order to acquire knowledge about the macroscopic characteristics and density so grown pine. Plantation growth (Buckman, 1985) is primarily carried out for species of wood which, in short rotation, accomplish the greatest financial and general useful functions in a given area. Under the provisions of ISO 3129 from year 1975, 76 test trees for studying were selected. From department 30 of unit Gata 40 test trees were taken, and from department 26 of unit Gata 36 test trees were taken. All relevant parameters were collected on selected test trees: geographical position, diameter at breast height, ground plan projection of tree top, tree orientation toward cardinal points, total tree height, height to first living branch and stump height (Kličić, 2006). Test trees were classified into three diameter classes: (1) 11 to 20 cm of diameter at breast height, (2) 21 to 30 cm of diameter at breast height and (3) 31 to 40 cm of diameter at breast height. From each test tree test sample of about 70 cm length was made, beginning at breast height. Following macroscopic properties were measured: ring width, latewood width and latewood percentage was calculated. Density was measured in oven dry condition and also basic density. The range of ring width of studied Scots pine is large and ranges from 0.3 mm to 16.6 mm, with mean value for all three diameter classes of 3.6 mm. The range of ring width can be also seen through the variance of 4.28. Mean values of ring width for each diameter class mutually differ significantly. Distribution trend of ring width in radial direction is downward, with no major signs of achieving more constant values for all diameter classes. Latewood percentage ranges from 1.7 % to 90 % with mean value of 38.6 % for all three diameter classes together. Distribution trend of latewood percentage in radial direction is growing. Density in oven dry condition ranges from 0.308g/cm3to 0.690 g/cm3, with mean value of 0.469 g/cm3for all three diameter classes. Wood in trees of diameter at breast height from 11 to 20 cm has mean value of density in oven dry condition of 0.482 g/cm3, in trees of diameter at breast height from 21 to 30 cm mean value of density in oven dry condition is 0.481 g/cm3, and in trees of diameter at breast height from 31 to 40 cm is 0.453g/cm3. Mean value of density in oven dry condition for all three diameter classes is significantly different. Distribution trend of density in oven dry condition is growing for all three diameter classes, without any indication of achieving more constant values. Basic density ranges from 0.283 g/cm3to 0.644 g/cm3, with mean value of 0.419g/cm3 for all three diameter classes together. Mean values of basic density for all three diameter classes mutually differ significantly.
Databáze: OpenAIRE
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