Aspects of the Aging Process in Cambium and Xylem

Bosshard, Hans Heinrich

doi:10.1515/hfsg.1965.19.3.65

Cited by 40 publications

(14 citation statements)

References 3 publications

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“…Die biologischen Aspekte der Kernholzbildung sind beispielsweise in den Arbeiten yon Chattaway (1952), Bosshard (1965), Hillis (1965Hillis ( , 1968aHillis ( ,b, 1971), Ziegler (1968) und Bamber (1976) ausffihrlich beschrieben. z6 Der Grundvorgang der Verkernung, d.h. das Absterben der lebenden Holzstrahl-und Holzparenchymzellen, wird yon zahlreichen Stoffwechselvorg~ingen (Stoffumwandlungen, Wasser-, Assimilat-und Ionentransporte) und mechanischen Ver~inderungen begleitet (Ziegler 1968 Dietrichs (1964b) vermutlich damit zu erkl~iren, daft sie in der Verkernungszone -dem ,,intermediate wood" bzw.…”

Section: Vorgang Der Verkernungunclassified

Einfluß der Verkernung und des Baumalters auf die Eigenschaften von Spanplatten aus Kiefernholz (Pinus sylvestris) Teil 1: Kernholz und seine Eigenschaften

Dix

Roffael

1997

Holz als Roh- und Werkstoff

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Die Eigenschaften yon Spanplatten werden vorwiegend dutch die Eigenschaften der eingesetzten Rohstoffe Holz und Bindemittel sowie dutch die Wechselwirkung zwischen ihnen bestimmt. Ziel eines Forschungsvorhabens war es, die natfirliche Dauerhaftigkeit des Kernholzes der in der Bundesrepublik Deutschland vorkommenden extraktstoffreichen Baumarten Kiefer, Douglasie, L/irche und Eiche bei der Herstellung von Spanplatten mit hoher biotogischer Resistenz gegenfiber holzzerst/Srenden Pilzen zu nutzen. Innerhalb dieser Zielsetzung war es yon Bedeutung, die Wechselwirkung zwischen dem Splint-und Kernholz yon obligatorisch verkernten wichtigen Nadelbaumarten und den Bindemitteln zu untersuchen. Die Ergebnisse werden in einer Ver6ffentlichungsreihe dargestellt. In diesem Beitrag wird eine Ubersicht fiber die Eigenschaften von Kernholz und deren Einflufl auf die Dauerhaftigkeit des Holzes insbesondere bei der Kiefer gegeben. Influence of heartwood and the age of tree on the properties of particleboards from pine Part 1: Heartwood and its propertiesThe properties of particleboards depend mainly on the lignocellulosic raw materials and the binders used for their preparation as well as on the interaction between the raw materials and the binders. The main objective of a research work was to use the natural durability of heartwood from different tree species such as pine, Douglas fir, larch and oak for the production of particleboard with high biological resistance. The results of the research work will he published in a series of articles in the journal. In this article the state of knowledge on the properties of heartwood from different species is discussed with main emphasis on pine wood.

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Section: Vorgang Der Verkernungunclassified

Einfluß der Verkernung und des Baumalters auf die Eigenschaften von Spanplatten aus Kiefernholz (Pinus sylvestris) Teil 1: Kernholz und seine Eigenschaften

Dix

Roffael

1997

Holz als Roh- und Werkstoff

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“…In both the cambial zone and conductive phloem, the cells of old beeches are significantly larger. As published data on other taxa show that length and periclinal width of fusiform initials and sieve tubes increase with age (Bosshard 1965;Iqbal and Ghouse 1990;Ajmal and Iqbal 1992;Ridoutt and Sands 1993), one can expect that the length of the corresponding beech cells follows the same pattern.…”

Section: Influence Of Tree Age On Tissue Structurementioning

confidence: 70%

A study of the cambial zone and conductive phloem of common beech (Fagus sylvatica L.) using an image analysis method

Vollenweider

Dustin

Hofer

et al. 1994

Trees

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Abstract. Quantification is a major problem when using histology to study the influence of ecological factors on tree structure. This paper presents a method to prepare and to analyse transverse sections of cambial zone and of conductive phloem in bark samples. The following paper (II) presents the automated measurement procedure. Part I here describes and discusses the preparation method, and the influence of tree age on the observed structure. Highly contrasted images of samples extracted at breast height during dormancy were analysed with an automatic image analyser. Between three young (38 years) and three old (147 years) trees, age-related differences were identified by size and shape parameters, at both cell and tissue levels. In the cambial zone, older trees had larger and more rectangular fusiform initials. In the phloem, sieve tubes were also larger, but their shape did not change and the area for sap conduction was similar in both categories. Nevertheless, alterations were limited, and demanded statistical analysis to be identified and ascertained. The physiological implications of the structural changes are discussed.

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“…These tissues show a reduced moisture content and a limited number of vital parenchyma cells (Jurášek 1956, Necesany 1958. Several developmental and environmental factors affect the formation and size of the dehydrated zone (Torelli 1984, Büren 1998, Fürst et al 2006, Račko & Cunderlík 2010; however, the age of the tree is a dominant factor in this process (Necesany 1958, Bosshard 1965.…”

Section: Introductionmentioning

confidence: 99%

Can bark stripping cause red heartwood formation in beech stems?

Račko¹,

Mišíková²,

Hlaváč³

et al. 2018

iForest

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Injuries to standing trees caused by logging and the subsequent changes in biochemical composition and anatomy of affected tissues lead to wood quality loss, thus lowering the commercial value of roundwood. In this study, we investigated the influence of various factors that could help mitigate or prevent the spread of infections in the stem caused by injuries. A total of 112 beech logs (tree age: 42-143 years) from ten forest stands at three different sites in central Slovakia were examined, and the extent of discolouration and decay zones in each stem was measured, along with cambial age, stem diameter, injury width, and injury closure period. The results showed that the width of physiologically active wet sapwood and the width of the inactive dehydrated zone in the stem are important factors influencing red heartwood formation. We found no significant differences in the extent of discolouration and decay among different stands and sites. Stem diameter and injury width did significantly affect the penetration of infection through sapwood, and red heartwood formation was significantly affected by cambial age and injury width, while stand age, site slope, beech proportion in the stand and injury closure did not show any significant effect. Binary logistic models were applied to assess the probability of pathogen penetration through sapwood into the stem dehydrated zone as a function of injury width and stem diameter, as well as the probability that this could lead to red heartwood formation based on injury width and cambial age of beech stems.

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Aspects of the Aging Process in Cambium and Xylem

Cited by 40 publications

References 3 publications

Einfluß der Verkernung und des Baumalters auf die Eigenschaften von Spanplatten aus Kiefernholz (Pinus sylvestris) Teil 1: Kernholz und seine Eigenschaften

Einfluß der Verkernung und des Baumalters auf die Eigenschaften von Spanplatten aus Kiefernholz (Pinus sylvestris) Teil 1: Kernholz und seine Eigenschaften

A study of the cambial zone and conductive phloem of common beech (Fagus sylvatica L.) using an image analysis method

Can bark stripping cause red heartwood formation in beech stems?

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