Branch collar
This article has been registered in the quality assurance biology for improvement due to formal or content-related deficiencies . This is done in order to bring the quality of the biology articles to an acceptable level. Please help improve this article! Articles that are not significantly improved can be deleted if necessary.
Read the more detailed information in the minimum requirements for biology articles .
A Astkragen is the relatively short road approach point at the base between branch and trunk and also monitored later beaded, thickened root collar , which is formed from the root tissue. In another view, the point of attachment is as Astkragen and comprehensive stem tissue than regular collar called. The astring then describes the overlapping of the branch collar and trunk collar.
The collar is the connection between branch and trunk, where bending , compressive and tensile stresses take effect. The plant tissue reacts to these (changing) loads and injuries as a result and thickens these problem areas, compressive stresses on the inner radius of the bend lead to folding, tensile stresses on the outer radius of the bend lead to stretching of the pathways in the bast tissue that carry the nutrients (conduction mostly from the crown to the roots) . The thickening resulting from the healing of the wound also increases the tensile strength and prevents the branch from breaking off under tension. The principle improved the stability of the branch and thus increased the ability to reproduce, which is why it prevailed in evolution (see evolutionary adaptation ).
In some trees it can hardly be clearly distinguished from the actual branch . The branch collar represents an important protection zone for the tree against pests , fungi and wood rot . In deciduous trees it is based on phenols and in conifers on terpenes . If the branch collar is cut away, a more or less large wound wood strip with different overflow patterns is created.
The callus collar, also known as a healing collar or shoulder wood , on the other hand, is a rounded thickening that surrounds a branch that is naturally shed from the tree → wound wood , farewell collar .
Individual evidence
- ↑ a b Alexandra Becker: Tree care - with special consideration of tree-biological relationships. Diplomica Verlag, 1999, ISBN 978-3-8324-5230-8 , pp. 115, 196 ff, 234, limited preview in the Google book search.
- ↑ a b Ralf Monnier: Tree pruning made easy: (Edition AVRA). Buchwerkstatt Berlin, 2017, ISBN 978-3-946467-36-6 , pp. 18-21.
- ^ AFZ: General forest journal for forest management and environmental protection. Volume 48, issues 1-12, p. 285.