Encyklopedie
About wood
VOLUME DENSITY OF TREES
DENSITY, VOLUME DENSITY, FSP AND DRYING OF SELECTED TREES (AVERAGE DATA) AT 15% AND 0% HUMIDITY
WOOD SPECIES
DENSITY
(kg/m3)
VOLUME DENSITY (g/cm3)
FSP w (%)
DRYING
r15
r0
R15
R0
LENGHT (%)
RADIAL
(%)
TANGENC. (%)
VOLUME (%)
Acacia 770 730 0,65 0,73 0,1 4,4 6,9 11,4 Pine 520 490 0,46 0,49 23-28 0,4 4 7,7 12,1 Beech 720 680 0,62 0,68 32-35 0,3 5,8 11,8 19,9 Oak 690 650 0,59 0,65 32-35 0,4 4 7,8 12,2 Hornbeam 830 790 0,71 0,79 32-35 0,5 6,8 11,5 18,8 Ash 690 650 0,59 0,65 0,2 5 8 13,2 Maple 630 590 0,55 0,59 0,5 3 8 11,5 Fir tree 450 410 0,39 0,41 30-34 0,1 3,8 7,6 11,5 Elm 680 640 0,59 0,64 0,3 4,6 8,3 13,2 Linden 530 490 0,45 0,49 32-35 0,3 3,5 6,3 10,1 Larch 590 550 0,51 0,55 23-28 0,3 3,3 7,8 11,4 Alder 530 490 0,45 0,49 0,5 4,4 7,3 12,6 Walnut 680 640 0,59 0,64 0,5 5,4 7,5 13,4 Aspen 450 420 0,4 0,42 32-35 0,3 3,5 8,5 12,8 Platan 630 580 0,54 0,58 0,5 4,5 8,7 13,7 Spruce 470 430 0,4 0,43 30-34 0,3 3,6 7,8 11,9 Poplar 450 410 0,39 0,41 32-35 0,3 5,2 8,3 13,8 Avodiré 550 510 0,48 0,51 34-36 3,5 6,5 9,6 Beta 600 560 0,52 0,56 23 1,2 3 Dibetou 550 510 0,48 0,51 23 3,5 5,9 7,3 Ebony 1020 1000 0,9 1 30-33 15 Framiré 550 510 0,48 0,51 30 2,9 4,5 8,5 Hikora 810 770 0,7 0,77 0,6 7,8 11 18,4 Iroko 680 640 0,59 0,64 20-23 3,8 5,6 10,5 Kosipo 670 630 0,58 0,63 30-35 4,5 6 11,3 Limba 580 540 0,5 0,54 32-36 0,3 3,5 6,3 10,1 Mahogany am. 590 550 0,51 0,55 21 0,3 3,2 5,1 8,6 Mahogany af. 520 480 0,45 0,48 26-30 4,1 5,8 11,2 Hakoré 670 630 0,58 0,63 31 6,2 8,2 14,3 Both samba 390 350 0,33 0,35 28 3,1 5,3 9,5 Okoumé Gaboon 460 420 0,4 0,42 25-29 0,2 4,1 6,6 10,9 Rosewood 880 850 0,75 0,85 18-24 8,8 Sapelli 710 670 0,61 0,67 30-33 5,2 6,8 13,5 Sipo 660 620 0,57 0,62 26-30 5,9 6,9 12,8 Teak 670 630 0,58 0,63 26-31 3,7 6 9,5 Tiama 550 510 0,48 0,51 36 5 7 13,4 Gedu, nohor, Tola 550 510 0,48 0,51 32 8,1 FSP – fiber saturation point (%)
R0 – density of dry wood
1.54 – specific weight of wood substance (g / cm3)
Wood - About Wood
Wood means matter of organic origin, which is created by natural processes with the interaction of air and soil in the trunk, branches and roots of woody plants. Wood is found in the trunks, branches and roots of woody plants between pulp and cambium.
Each tree has three main parts: the crown (a set of branches with leaves), the trunk and the roots.Typical features for individual tree species
Spruce: Spruce wood is creamy white to brownish, with distinct annual rings. On all three sections (transverse, longitudinal, tangent) we can easily notice a clear color difference between the spring and summer incremental layers of wood.
Fir: The color of the wood, from creamy white to light yellow-brown, closely resembles spruce, but fir wood is a little less shiny.
Pine: the white part is creamy white to ocher, the core orange-brown to rust. The annual rings are pronounced.Larch: The white layer is light yellow-brown, the core ocher to reddish-brown. The texture (drawing of annual rings) is thicker than spruce and excels in the beauty of many small, mostly well-overgrown knots.
Douglas fir: White wood is slightly lighter than heartwood, which has a light reddish brown color. The longitudinal section shows a distinctive drawing of annual rings.
Yew: The color of the heartwood varies from orange-brown with dark annealing to purple-brown with darker mallow or brown spots and spots of growing bark.
Oak: It has a relatively narrow, light brown white and a wide, evenly brown core. Distinctive “mirrors” (cut marrow rays) appear on the central and tangential section. Thanks to them, oak can be safely distinguished from elm or ash.
Elm: Core wood is usually distinctly chocolate brown, often with a reddish tinge, and is markedly different from lighter whitish wood. Core wood has narrower and irregular annual rings.
Ash: White, broad in young trees, narrower in old ones, creamy white, whiter in some individuals than maple, other pinkish. The core is usually irregularly demarcated, dark brown. Distinctive annual rings.
Acacia: From a narrow brownish-white white to a marrow there is a yellow-green-brown color, with a different, often interesting drawing. The annual rings are clearly visible.
Beech: Beech wood is very light cream to pinkish brown and often acquires a reddish bronze-brown color after steaming. It is straight-fiber, with wide marrow rays, and has a fine, regular texture.
Hornbeam: There is no difference between white and heartwood – both are indistinct white with gray stripes and spots, caused by wide marrow rays that form a speckled pattern when cut into quarters. It is usually irregularly or transversely fluted and has a fine, symmetrical texture.
Alder: There are only slight differences in color between white and heartwood, in general the alder wood is indistinct, without gloss, freshly cut it has a bright orange-brown color, which ripens to light reddish brown, with dark stripes in places of wide rays . The wood is straight-fiber, except for the places around the knots, and with a fine texture.
Maple: White wood is practically indistinguishable from the core; both are creamy white and have a narrow, straight pattern and indistinguishable annual rings. The texture is smooth, soft.
Birch: There is no color difference between white and heartwood, both have an inconspicuous creamy white to light brown color. The wood has a fine sagging and a fine texture. Marrow spots can be observed in the wood, which form irregular dark spots.
Linden: Creamy to yellow or gray-white colored, relatively firm, soft wood is uniformly dense.
Poplar: Core wood is not clearly separated from white wood, it is creamy white to very light straw in color, in some species light brown or pink-brown. It is usually straight-fiber and somewhat rougher (felt surface of the wood), but has a fine, regular texture.
Walnut: The heartwood is usually gray-brown, with irregular dark brown to black veins, accentuated by the naturally wavy course of the fibers. This wood with a distinctive pattern forms the core significantly different from other wood.
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Tree names
Czech Botanical name
Abbreviation
Latin name
English name
German name
Trnovník akát (akát bílý)
AK
Robinia pseudoacacia L.
false acacia, black locust
Robinie
Borovice lesní
BO
Pinus sylvestris L.
Pine
Kiefer, Föhre
Borovice černá
BOC
Pinus nigra ARNOLD
Austrian pine, European black pine
Schwarzkiefer
Bříza bílá (syn. b. bělokorá nebo b. bradavičnatá)
BR
Betula alba L.
Birch
Birke
Buk lesní
BK
Fagus sylvatica L.
Beech
Buche
Douglaska tisolistá
DG
Pseudotsuga menziesii (Mirbel) Franco
Douglas fir
Douglasie
Dub letní, Dub zimní
DB
Quercus robur L., Q. petraea Liebl.
Oak
Eiche
Habr obecný
HB
Carpinus betulus L.
Hornbeam
Hainbuche
Jalovec obecný (případně j. viržínský aj.čínský)
JAL
Juniperus communis L. (případně J. virginiana a J. chinensis)
Juniper
Wacholder
Jasan ztepilý
JS
Fraxinus excelsior L.
Ash
Eshe
Javor klen, Javor mléč
KL, JV
Acer pseudoplatanus L., A. platanoides L.
Maple
Ahorn
Jedle bělokorá
JD
Abies alba Mill.
Fir
Tanne
Jilm horský, Jilm vaz, Jilm habrolistý
JL
Ulmus montana Stok., U. laevis Pall., U. carpinifolia Gled.
Elm
Ulme
Lípa srdčitá, Lípa velkolistá
LP
Tilia cordata Mill., T. platyphylla Scop.
Basswood, lime
Linde
Modřín opadavý
MD
Larix decidua Mill.
Larch
Lärche
Olše lepkavá, Olše šedá
OL, OLS
Alnus glutinosa Gaertn., A. incana Moench.
Alder
Erle
Ořešák královský
OR
Juglans regia L.
Common walnut
Walnussbaum
Smrk ztepilý SM
Picea abies (L.) Karsten Spruce
Fichte
Švestka domácí
Prunus domestica L.
Plum
Pflaume
Tis červený
TS
Taxus baccata L.
Yew
Eibe
Topol černý, topol bílý, topol osika
TPC, TP, OS
Populus nigra L., P. alba L., P. tremula L.
Poplar
Pappel
Třešeň ptačí
TR
Cerasus avium (L.) Moench.
Cherry tree
Kirschbaum
Borovice vejmutovka
VJ
Pinus strobus L.
Eastern white pine, Weymouth pine
Weymouthskiefer, Strobe
Vrba bílá, vrba křehká
VR
Salix alba L., S. fragilis L.
Willow
Weide
(3) Source: ZEIDLER, A., LEXIKON DŘEVA, ČESKÁ ZEMĚDĚLSKÁ UNIVERZITA V PRAZE, FAKULTA LESNICKÁ A DŘEVAŘSKÁ, 2012
IN WHICH AGE ARE TREES CHOPPED DOWN
TYPE AGE IN YEARS Locust tree 20-60 Poplar black 30 Birch tree, Poplar white, Alder tree 40 Maple, Cedar, Cherry tree, Sycamore maple 50 Larch, Ebony, Elm, Pine 70-80 Fir tree, Ash tree, Walnut tree 100 Beech 100 Chestnut, Cypress tree, Oak 80-250 WOODHARDNESS
Very hard Ebony, Box tree, Hawthorn, Hornbeam Hard Cherry tree, Maple, Oak, Yew tree Medium hard Beech, Walnut tree, Chestnut, Pear tree, plane tree, locust tree, Mahogany, Cedar tree, Ash tree, Teak Soft Fir tree, Birch tree, Alder tree, Pine, Spruce Very soft Poplar tree, Willow tree, Balsa