Temat: cechy morfologiczne - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Cechy diagnostyczne jesionu wyniosłego (Fraxinus excelsior L.) z falistością włókien rosnącego na Ukrainie
Diagnostic features of Fraxinus excelsior L. with wavy-grained wood growing in Ukraine
Autorzy:: Sopushynskyy, I.
Teischinger, A.
Powiązania:: https://bibliotekanauki.pl/articles/1318417.pdf
Data publikacji:: 2013
Wydawca:: Instytut Badawczy Leśnictwa
Tematy:: lesnictwo
Ukraina
drzewa lesne
jesion wyniosly
Fraxinus excelsior
cechy biometryczne
cechy morfologiczne
budowa drewna
gestosc drewna
drewno jesionowe
drewno falistowlokniste
analiza dendrochronologiczna
struktura drewna
makrostruktura
common ash
wavy-grained wood
biometry
decorative wood
anomaly wood
forest stands
Opis:: The paper presents analysis of biometric features of ash with wavy-grained wood, which has decorative appeal. The research results shows that fresh broadleaves ash forest stands growing in the Vinnytsya and Sokyryany Regions of Ukraine have high potential for growing curly ash. The differences between straight-grained and wavygrained wood density and macrostructure were analysed and estimated. Statistical evaluation of the aesthetic macrostructure of wood characteristics indicated that the length of wave varied from 3.25 to 10.83 mm and its amplitude varied from 0.37 to 1.74 mm. The average width and mean height of anomalies in wood formation were equal to 15.89 mm and 5.00 mm, and their mean occurrence was 30 times m-2. Average annual growth ring width of wavy-grained ash wood was clearly greater (by 25 %) than that of straight-grained wood. The density of wavygrained wood was 82 kg·m-3 higher than straight-grained wood after oven-drying and 70 kg·m-3 higher prior to ovendrying.
Źródło:: Leśne Prace Badawcze; 2013, 74, 3; 189-195
1732-9442
2082-8926
Pojawia się w:: Leśne Prace Badawcze
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Związki między wybranymi cechami drzewa a niektórymi właściwościami drewna młodocianego sosny zwyczajnej (Pinus sylvestris L.)
Relationships between selected tree characteristics and the properties of juvenile wood in Scots pine (Pinus sylvestris L.)
Autorzy:: Tomczak, A.
Powiązania:: https://bibliotekanauki.pl/articles/1312952.pdf
Data publikacji:: 2014
Wydawca:: Instytut Badawczy Leśnictwa
Tematy:: lesnictwo
drzewa lesne
sosna zwyczajna
Pinus sylvestris
cechy morfologiczne
wysokosc drzew
piersnice drzew
wysokosc osadzenia pierwszej zywej galezi
srednica korony
dlugosc korony
drewno sosnowe
drewno mlodociane
gestosc drewna
gestosc umowna
wytrzymalosc na sciskanie wzdluz wlokien
wytrzymalosc na zginanie statyczne
modul elastycznosci przy zginaniu
korelacja cech
basic density
strength perpendicular to grain
bending strength
modulus of elasticity
breast height
diameter
tree height
crown length
crown diameter
Opis:: The aim of this study was to determine relationships between selected properties of juvenile wood and characteristics of the stem and crown of Scots pine. Analyses were conducted in northern Poland in eight mature pine monocultures. Nine trees were selected in each experimental site and their stems were divided into five sections. The centers of the sections were established at a height of 1.3 m from the tree base and at points corresponding to 20, 40, 60 and 80% tree height. Samples were taken from these locations, and these samples were prepared for analyses of basic density, compressive strength along the grain and static bending, as well as the modulus of elasticity during bending. The mean height of the investigated group of trees was 26.0 m with an average diameter breast high of 33.6 cm. The mean crown depth was 7.8 m and crown diameter was 3.6 m, and the mean basic density (Qu) of juvenile pine wood was 416 kg/m3. The average compressive strength along the grain (CS) was determined to be 22.3 MPa, while static bending strength (BS) was 45.8 MPa. The recorded modulus of elasticity (MOE) was 4726 MPa. Both in general terms and when dividing stems into sections, the wood properties correlated with tree characteristics to various degrees. All indexes were negative indicating that trees of greater dimensions produce juvenile wood of inferior quality. Properties of juvenile wood formed during various periods of tree life were mostly related to diameter breast high and crown depth. They were also correlated with tree height, but only to a limited extent. In contrast, properties of wood from the middle stem sections were significantly correlated with crown diameter.
Źródło:: Leśne Prace Badawcze; 2014, 75, 3; 237-244
1732-9442
2082-8926
Pojawia się w:: Leśne Prace Badawcze
Dostawca treści:: Biblioteka Nauki

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