<abstract xmlns="http://www.w3.org/1999/xhtml"><p>We assessed wood quality in common walnut using a combination of physical properties and structural features. Five common walnut trees were selected and processed in order to produce wood samples for further analyses.</p><p>The results showed a wide spread of values of structural features and of wood water content. The color indices were strongly grouped around the averages. All experimental distributions were stratified following at least one of the analyzed factors (tree and its structural directions i.e. longitudinal, radial, and tangential). The radial anisotropy was the most pronounced. The longitudinal stability of density and water content, the inter-tree stability of color saturation as well as the homogeneity of all color indices on the girth were noticed. The heartwood covered up to 12.5% of transverse section and included 1–10 growth rings. The annual rate of bio-accumulation allowed the separation of stages of radial development of the structure using the width of growth rings: <italic>juvenile wood</italic>, composed of the first 8–9 rings from the pith; a <italic>transition zone</italic> to the mature wood (10 rings); and <italic>mature wood</italic> under way to be formed. Wood density was not a reliable criterion for differentiating the sapwood from heartwood but brightness, redness and hue’s color could be used for this purpose.</p></abstract>

We assessed wood quality in common walnut using a combination of physical properties and structural features. Five common walnut trees were selected and processed in order to produce wood samples for further analyses.The results showed a wide spread of values of structural features and of wood water content. The color indices were strongly grouped around the averages. All experimental distributions were stratified following at least one of the analyzed factors (tree and its structural directions i.e. longitudinal, radial, and tangential). The radial anisotropy was the most pronounced. The longitudinal stability of density and water content, the inter-tree stability of color saturation as well as the homogeneity of all color indices on the girth were noticed. The heartwood covered up to 12.5% of transverse section and included 1–10 growth rings. The annual rate of bio-accumulation allowed the separation of stages of radial development of the structure using the width of growth rings: juvenile wood, composed of the first 8–9 rings from the pith; a transition zone to the mature wood (10 rings); and mature wood under way to be formed. Wood density was not a reliable criterion for differentiating the sapwood from heartwood but brightness, redness and hue’s color could be used for this purpose.

Physical properties and structural features of common walnut (<italic>Juglans regia</italic> L.) wood: A case-study / Physikalische Eigenschaften und strukturelle Charakteristika des Holzes der Walnuß (<italic>Juglans regia</italic> L.): Eine Fallstudie

Faculty of Silviculture and Forest Engineering, University ”Transylvania” of Brasov. Sirul Beethoven 1, 500123 Brasov,

Die Bodenkultur: Journal of Land Management, Food and Environment

This article is distributed under the terms of the Creative Commons Attribution Non-Commercial License, which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Physical properties and structural features of common walnut ( L.) wood: A case-study / Physikalische Eigenschaften und strukturelle Charakteristika des Holzes der Walnuß ( L.): Eine Fallstudie

We assessed wood quality in common walnut using a combination of physical properties and structural features. Five common walnut trees were selected and...

Physical properties and structural features of common walnut (Juglans regia L.) wood: A case-study / Physikalische Eigenschaften und strukturelle Charakteristika des Holzes der Walnuß (Juglans regia L.): Eine Fallstudie

Article Category: Research Article

Published Online: Sep 08, 2016

Page range: 105 - 120

Received: Jan 05, 2016

Accepted: May 15, 2016

DOI: https://doi.org/10.1515/boku-2016-0010

Keywords
common walnut, wood quality, physical properties, structural features, heartwood, juvenile wood, mature wood

© 2016 De Gruyter, www.degruyter.com/view/j/boku

This article is distributed under the terms of the Creative Commons Attribution Non-Commercial License, which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Physical properties and structural features of common walnut (Juglans regia L.) wood: A case-study / Physikalische Eigenschaften und strukturelle Charakteristika des Holzes der Walnuß (Juglans regia L.): Eine Fallstudie

Article Category: Research Article

Published Online: Sep 08, 2016

Page range: 105 - 120

Received: Jan 05, 2016

Accepted: May 15, 2016

DOI: https://doi.org/10.1515/boku-2016-0010

Keywordscommon walnut, wood quality, physical properties, structural features, heartwood, juvenile wood, mature wood

© 2016 De Gruyter, www.degruyter.com/view/j/boku

This article is distributed under the terms of the Creative Commons Attribution Non-Commercial License, which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Keywords
common walnut, wood quality, physical properties, structural features, heartwood, juvenile wood, mature wood