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1
Content available Influence of thickness on bendability of aspen wood
100%
Gaborik J.
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2014
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tom 88
EN
Influence of thickness on the bendability of aspen wood. Aspen is a little industrial exploitation of wood. For its application in the manufacture of molded furniture, it is necessary to know its bendability. In this work we focused on the influence of the thickness on the bendability of aspen wood. Bendability varies depending on the thickness.
PL
Wpływ grubości na możliwości gicia drewna osiki. Osika ma niewielkie zastosowanie w przemyśle. Aby opracować założenia technologiczne jego zastosowania w meblach giętych, należy zbadać możliwość gięcia tego drewna. W pracy skupiono się na możliwości gięcia drewna osiki w zależności od jego grubości, wykazano że te możliwości zmieniają się wraz z grubością.
2
Content available remote Influence of thickness on bendability of aspen wood
100%
Gáborík J.
Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology
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2014
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tom No. 88
65--69
EN
Influence of thickness on the bendability of aspen wood. Aspen is a little industrial exploitation of wood. For its application in the manufacture of molded furniture, it is necessary to know its bendability. In this work we focused on the influence of the thickness on the bendability of aspen wood. Bendability varies depending on the thickness.
3
Content available Osika w ludowym językowym obrazie świata
72%
Marczewska M.
Etnolingwistyka. Problemy Języka i Kultury
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1995
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tom 7
97–115
PL
Celem artykułu jest odtworzenie (utrwalonego w języku i kulturze) obrazu drzewa, które w tradycji ludowej jest niezwykle silnie obciążone ładunkiem „niesamowitości”, mianowicie – osiki. Obraz osiki utrwalony w języku i kulturze ludowej jest konsekwencją pewnego nadrzędnego przyporządkowania tego drzewa do drzew złych (jedyne drzewo, które się trzęsie), powiązanych z diabłem, istotami o medialnej naturze i wszelkimi szkodliwymi mocami (magią). Podporządkowanie takie zostało utrwalone (częściowo) w nazwach tego drzewa zróżnicowanych terytorialnie. Układ kategorii i ich wypełnienie określoną treścią świadczy o tym, że obraz osiki jest rezultatem swoiście interpretowanych zjawisk otaczającego świata i oddaje punkt widzenia człowieka stykającego się z przyrodą i zastanawiającego się nad wszystkim, co w przyrodzie nieoczekiwane, tajemnicze i nie do końca objaśnione.
EN
The aim of the article is to recreate the image of the tree (rooted in language and culture), which has a strong charge of 'incredibility' in the folk tradition, namely, the image of the aspen. The view of the aspen perpetuated in folk language and culture is the consequence of a certain superordinate assignment of this tree to the category of evil trees (the only tree that trembles), related to the devil, creatures of a mediatory nature, and all kinds of evil forces (magic). Such a perception has been (partly) perpetuated in the diverse names of this tree that depend on the region a given name can be found. The arrangement of the categories and their particular content shows that the view of the aspen is the result of the phenomena of the outside world that are interpreted in a peculiar way, and also reflects the vantage point of a human being that comes in contact with nature and wonders about everything in nature that is unexpectable, mysterious, and not full explained.
4
Content available Growth of Populus tremula on CO2-enriched soil at a natural mofette site
72%
Vejpustkova M. , Thomalla A. , Cihak T. , Lomsky B. , Pfanz H.
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tom 75
EN
The main objective of the study was to evaluate inter-annual ring-width variation and cumulative growth of aspen (Populus tremula L.) trees growing on the spots of different soil CO2 concentration at natural mofette site. We hypothesized that growth rate of trees is affected by CO2 concentration within their rooting zone. The study site was situated in the flood plain of Plesná stream near Hartoušov (Western Bohemia). Trees growing in a pure aspen stand were selected according to the CO2-gas regime within their rooting zone. Five high [CO2] trees (10–25% CO2 in the soil) and five low [CO2] trees (up to 3% CO2 in the soil) were sampled. Stem growth analysis of each trunk was carried out to study growth pattern in detail. High and low [CO2] trees significantly differed in a growth rate. At the age of 25 years, the basal area of high [CO2] trees exceeded low [CO2] trees by 39 %. The positive effect of CO2 on annual increment was pronounced particularly in the years with optimal growing conditions. Results suggest that trees can be fertilized not only by elevated atmospheric CO2 but also when fed with CO2 via the roots.
5
The effect of age on desorption stress and strain rate in birch and aspen
72%
Widlak H.
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nr 2
EN
The aim of the present study was to establish the value of desorption stresses and the rate of their increase in the samples of juvenile and mature birch wood as well as in aspen samples of different physiological age. The stress value was calculated on the basis of the measurement of the force necessary to restrain shrinkage in the sample being dried. Additionally, moisture strain and mechanical-moisture strain (both real and apparent) were measured during the experiments. The samples were dried at temperatures of 30, 50 and 70°C. It was concluded that both the rate of increase and the absolute values of stress and strain are different in juvenile and mature birch wood. Also in aspen they depend on the physiological age of the wood tissue. Juvenile birch wood and the physiologically younger aspen proved more susceptible to strain caused by desorption stresses.
6
Content available Seed vigor, photosynthesis and early growth of saplings of different triploid Betula families
58%
Mu H. , Jiang J. , Li H. , Liu G.
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tom 68
EN
Breeding scientists have given extensive attention to triploids in trees because of their importance to forestry. Consequently, creating and breeding triploids of good quality has become one of purposes of tree breeding. We chose two autotetraploids (Betula platyphylla, named Q10 and Q65) as female parents and eight hybrid diploids (B. platyphylla × B. pendula, named F1 – F8) as male parents to obtain progenies through controllable pollination, resulting in triploid progenies. Germination rate and germination energy of triploid seeds of Q65 were significantly higher (P < 0.01) than in triploid seed s of Q10. Triploid families with Q65 as female parent had a large quantity of saplings, whereas triploid families with Q10 as female parent had a small quantity of saplings. Triploid families with Q65 as female parent were generally superior in base diameter and height to base diameter ratio when compared to a diploid family. Q65×F3 was preliminarily recognized as the superior family. These results demonstrate that the female parent has a major influence on triploid progenies, although the male parent also has a small influence. The results provided a reference to build seed orchards of triploid birch trees, choose tetraploids as female parents and forecast triploid families of good quality.
7
Content available Chosen properties of clayey soils on an afforested dumping ground of a sulfur mine
44%
Bielinska E. J. , Domzal H. , Wegorek T.
Acta Agrophysica
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2001
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tom 56
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