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Holz als Roh- und Werkstoff

, Volume 63, Issue 5, pp 327–333 | Cite as

Variation of certain chemical properties within the stemwood of black locust (Robinia pseudoacacia L.)

  • S. Adamopoulos
  • E. Voulgaridis
  • C. Passialis
ORIGINALARBEITEN ORIGINALS

Abstract

From the bottom, middle, and top of three mature 35 to 37-year old black locust tree discs were cut and analysed to determine the variation within the stem of certain chemical properties. Hot-water extractive content was greater in heartwood than in sapwood, while the reverse occurred for the dichloromethane extractive content. Vertical stem analysis of hot-water extractives showed that they increased in heartwood but decreasedin sapwood from the bottom to the top of the stems while the reversal occurred for dichloromethane extractive content of sapwood. At the bottom and the middle of the stems, ash content was greater in sapwood than in heartwood, but at the top no difference was found between heartwood and sapwood. Ash content of both heartwood and sapwood was found to increase in the axial direction with respective values of 0.36% (bottom) and 0.76% (top) for heartwood and of 0.65% (bottom) and 0.76% (top) for sapwood. Ash analysis showed that considerable variations were found for the inorganic elements K and P being greater in sapwood than in heartwood. Heartwood was more acid than sapwood except for the top of the stems. Acidity mean values were found to increase from the bottom to the top of the stems in heartwood while they slightly decreased in sapwood. Total buffering capacity of heartwood was greater than that of sapwood and total buffering capacity of sapwood exhibited an inverse relationship to height. Very small acid equivalent values were determined only in sapwood. At the bottom, lignin content in heartwood (25.73%) was greater than in sapwood (18.13%). Lignin content of heartwood decreased from 25.73% at the bottom to 18.33% at the top, while that of sapwood was 18.13% at the bottom, 21.42% at the middle and 19.64% at the top.

Keywords

Lignin Content Extractive Content Black Locust Robinia Pseudoacacia Fengel 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Variation verschiedener chemischer Eigenschaften im Stammholz von Robinie (Robinia pseudoacacia L.)

Zusammenfassung

Vom unteren, mittleren und oberen Teil der Stämme von drei ausgewachsenen 35–37 Jahre alten Robinien wurden Stammscheiben herausgeschnitten und analysiert, um die Variation bestimmter chemischer Eigenschaften innerhalb des Stammes zu bestimmen. Insgesamt war der Heisswasser-Extraktstoffgehalt im Kernholz höher als im Splintholz, während für den Di-Chlormethan-Extraktstoffgehalt das Gegenteil der Fall war. Die senkrechte Stammanalyse der Heisswasser-Extraktstoffe ergab, dass der Extraktstoffgehalt im Kernholz vom unteren Stammende zum Zopf hin zunahm, aber im Splintholz abnahm, während der Di-Chlormethan-Extraktstoffgehalt im Splintholz zum Zopf hin zunahm. Die unteren und mittleren Stammteile wiesen im Splintholz einen höheren Aschegehalt auf als im Kernholz. Im oberen Teil unterschied sich der Aschegehalt zwischen Kern- und Splintholz nicht. Der Aschegehalt stieg sowohl im Kern- als auch im Splintholz in Stammlängsrichtung an, im Kernholz von 0.36% (unten) auf 0.76% (oben) und im Splintholz von 0.65% (unten) auf 0.76% (oben). Die Aschenanalyse ergab beträchtliche Schwankungen bei den anorganischen Elementen K und P. Im Splintholz waren diese höher als im Kernholz. Das Kernholz lag mit Ausnahme des oberen Stammbereichs mehr im sauren Bereich als Splintholz. Die durchschnittlichen Säurewerte nahmen im Kernholz in Stammlängsrichtung von unten nach oben zu und im Splintholz leicht ab. Die Gesamtpufferkapazität im Kernholz war grösser als im Splintholz, wo sie mit zunehmender Stammhöhe abnahm. Der Ligningehalt war im unteren Stammbereich im Kernholz höher (25.73%) als im Splintholz (18.13%). Im Kernholz verringerte sich der Ligningehalt von 25.73% im unteren Stammbereich auf 18.33% im Zopfbereich, während der Ligningehalt im Splintholz im unteren Teil bei 18.13% lag, in der Mitte bei 21.42% und im Zopfbereich bei 19.64%.

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Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  1. 1.Department of Forestry and Natural Environment, Laboratory of Forest UtilizationAristotle UniversityThessalonikiGreece

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