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  1. Forstwissenschaftliches Centralblatt vereinigt mit Tharandter forstliches Jahrbuch
  2. Forstwissenschaftliches Centralblatt vereinigt mit Tharandter forstliches Jahrbuch : Volume 118
  3. Forstwissenschaftliches Centralblatt vereinigt mit Tharandter forstliches Jahrbuch : Volume 118, Issue 1-6, December 1999
  4. Twig abscission (cladoptosis) and its ecophysiological significance for decline symptoms inQuercus robur L.
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Forstwissenschaftliches Centralblatt vereinigt mit Tharandter forstliches Jahrbuch : Volume 136
Forstwissenschaftliches Centralblatt vereinigt mit Tharandter forstliches Jahrbuch : Volume 135
Forstwissenschaftliches Centralblatt vereinigt mit Tharandter forstliches Jahrbuch : Volume 134
Forstwissenschaftliches Centralblatt vereinigt mit Tharandter forstliches Jahrbuch : Volume 133
Forstwissenschaftliches Centralblatt vereinigt mit Tharandter forstliches Jahrbuch : Volume 132
Forstwissenschaftliches Centralblatt vereinigt mit Tharandter forstliches Jahrbuch : Volume 131
Forstwissenschaftliches Centralblatt vereinigt mit Tharandter forstliches Jahrbuch : Volume 130
Forstwissenschaftliches Centralblatt vereinigt mit Tharandter forstliches Jahrbuch : Volume 129
Forstwissenschaftliches Centralblatt vereinigt mit Tharandter forstliches Jahrbuch : Volume 128
Forstwissenschaftliches Centralblatt vereinigt mit Tharandter forstliches Jahrbuch : Volume 127
Forstwissenschaftliches Centralblatt vereinigt mit Tharandter forstliches Jahrbuch : Volume 126
Forstwissenschaftliches Centralblatt vereinigt mit Tharandter forstliches Jahrbuch : Volume 125
Forstwissenschaftliches Centralblatt vereinigt mit Tharandter forstliches Jahrbuch : Volume 124
Forstwissenschaftliches Centralblatt vereinigt mit Tharandter forstliches Jahrbuch : Volume 123
Forstwissenschaftliches Centralblatt vereinigt mit Tharandter forstliches Jahrbuch : Volume 122
Forstwissenschaftliches Centralblatt vereinigt mit Tharandter forstliches Jahrbuch : Volume 121
Forstwissenschaftliches Centralblatt vereinigt mit Tharandter forstliches Jahrbuch : Volume 120
Forstwissenschaftliches Centralblatt vereinigt mit Tharandter forstliches Jahrbuch : Volume 119
Forstwissenschaftliches Centralblatt vereinigt mit Tharandter forstliches Jahrbuch : Volume 118
Forstwissenschaftliches Centralblatt vereinigt mit Tharandter forstliches Jahrbuch : Volume 118, Issue 1-6, December 1999
Forest management strategies in the context of potential climate change
Height increment models for Austrian forests
Logistics in timber production — state-of-the-art and perspectives
Measuring fragmentation and structural diversity
The influence of elevated CO2 on growth parameters of various provenances of European beech (Fagus sylvatica L.) at different irradiance
Buchbesprechungen
Editorial
Conservation of species, processes and resources against the background of faunistic investigations of the forest canopy
Indicators of forest soil fertility — temporal changes and anthropogenic impact
Forests in the alps and their performance under the conflicting social forces of the future
Generation of variable assortment and calculation tables for forest management
Development prognosis of forest ecosystems in the light of hierarchy theory
Buchbesprechungen
Yield tables for Norway spruce stands in Greece
Economic investigation of advanced planting in old spruce stands
Carbon budget of a virginNothofagus forest in Tierra del Fuego
Dead wood research in forest reserves of Northwest-Germany: methodology and results
Vegetation ecology of primeval and managed forests. Comparison of Tilio-Carpinetum-stands in the Bialowieza forest area (Northeastern Poland)
Opportunities for balance-sheets in forestry-companies in view of the circumstances of the German commerce law and tax-law
Estimating chemical soil parameters for sample plots of the Austrian Forest Inventory
Changes in forest growth
Radial growth of Norway spruce and European beech in relation to weather and altitude
Twig abscission (cladoptosis) and its ecophysiological significance for decline symptoms inQuercus robur L.
Interpretation of the nutritional status of forest trees by the Diagnosis and Recommendation Integrated System (DRIS)
Forest liming and root system of beech (Fagus sylvatica) A case study in the Sauerland region
Deadwood in commercial forest: a source of danger for the outbreak of pest species?
Application of sample inventory data for prognosis, harvest planning and silvicultural improvement in a forest district
List of reviewers in the year 1999
A simple routine method for assessing the SO4 2− remobilization potential of forest soils for sulfate-sulfur from atmospheric deposition
Water chemistry in a forested catchment as influenced by biogeochemical transformations in riparian soils
Estimating tree heights with Johnson’s SBB-distribution
Forest science or forest sciences: interdisciplinarity between inevitability, vision, and utopia
Buchbesprechungen
Forstwissenschaftliches Centralblatt vereinigt mit Tharandter forstliches Jahrbuch : Volume 117
Forstwissenschaftliches Centralblatt vereinigt mit Tharandter forstliches Jahrbuch : Volume 116

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Twig abscission (cladoptosis) and its ecophysiological significance for decline symptoms inQuercus robur L.

Content Provider Springer Nature Link
Author Klugmann, K. Roloff, A.
Copyright Year 1999
Abstract In der vorliegenden Arbeit wurde der als Kladoptosis bekannte Prozeß der Zweigabgliederung anQuercus robur L. untersucht. Danach ist die Anlage zur Ausbildung einer Trennungszone während des Knospenstadiums an allen Seitenknospen vorhanden. Dagegen können Triebe, die aus der Terminalknospe entstanden sind, nicht abgegliedert werden. Bei jungen Stiel-Eichen geht unmittelbar nach dem Austrieb der Seitenknospen ihre Abgliederungsfähigkeit verloren. Mit zunehmendem Baumalter verzögert sich die Formation regulären Xylems im Abzweigungsbereich der Seitentriebe.Die Aufrechterhaltung der Trennungszone bewirkt aufgrund ihres histologischen Aufbaus eine Reduzierung der hydraulischen Leitfähigkeit. Die mit einer Trennungzone ausgestatteten Zweige befinden sich in einer indifferenten Phase, in der sie von dem regulären Hydrosystem des Baumes separiert sind. Sie können nachfolgend durch Abgliederung vollständig von ihm getrennt oder durch Eingliederung permanent an das Hydrosystem angeschlossen werden. Bei zusätzlichen negativen Umweltbedingungen steigt der Anteil der nur provisorisch an das Hydrosystem des Baumes angeschlossenen Zweige. In dieser Situation setzt die Eingliederung — Bildung regulären Xylems — nur noch im Abzweigungsbereich der vitalsten Seitenachsen ein.Aufgrund der Reduzierung der hydraulischen Leitfähigkeit wird es dem Baum möglich, das ihm verfügbare Wasser selektiv in der Krone zu verteilen. Eine reduzierte Eingliederungsdynamik der Trennungszone erhöht den hydraulischen Widerstand des daran anschließenden Sprosses. Die in dieser Situation steigende Anzahl der Trennungszonen führt zur Förderung der eingegliederten Leitäste und schützt diese vor unkontrollierter Xylem-Kavitation.The process known as cladoptosis has been investigated inQuercus robur L.. The results show an ontogenetic alteration of the hydraulic architecture which is additionally modified by the vigour of the tree.The preformation of the abscission zone is still present in all lateral buds during bud dormancy. Terminal shoots, however, do not form an abscission zone at their base at any time, which causes their inability to abscise. During juvenile ontogenesis the absciseability of the lateral buds is lost immediately after sprouting. In the further course of ontogenesis the formation of regular xylem (integration) within the stem junctions of the lateral shoots is retarded. The constricted conduits within the abscission zone limit hydraulic conductivity, equivalent to an increase in the hydraulic resistance. However, the absciseable twigs and branches are in an indifferent stage in which they are separated from the regular hydraulic system of the tree. In this stage hydraulically separated shoots are either connected by integration or disconnected by abscission. Negative environmental conditions increase the number of indifferent shoots. In this situation integration only occurs in the junctions of the most vigorous twigs.This special reaction optimizes the hydraulic conductivity by distributing a given water flow selectively within the branching. The hydraulic resistance of the shoot is increased by reduced integration dynamics. The increased number of abscission zones induced by unfavourable environmental conditions enables the tree to avoid runaway embolism during excessive droughts.The active control given by cladoptosis allows the tree to evaluate and control the xylem flow within its branching pattern. The integration and abscission of twigs varies according to environmental conditions. Years with water deficiencies reduce the photosynthesis of the indifferent (less vigorous) twigs and let them cavitate earlier, whereas photosynthesis of the youngest as well as the integrated twigs obviously remains unaffected.
Starting Page 271
Ending Page 286
Page Count 16
File Format PDF
ISSN 00158003
Journal Forstwissenschaftliches Centralblatt vereinigt mit Tharandter forstliches Jahrbuch
Volume Number 118
Issue Number 1-6
e-ISSN 14390337
Language English
Publisher Springer-Verlag
Publisher Date 1999-01-01
Publisher Place Berlin, Heidelberg
Access Restriction Subscribed
Subject Keyword twig abscission (cladoptosis) Quercus robur L. hydraulic resistance xylem cavitation decline symptoms Forestry Plant Sciences Plant Ecology
Content Type Text
Resource Type Article
Subject Plant Science Forestry
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