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Long-term effects of pruning on the trunk of lime and horsechestnut

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Forstwissenschaftliches Centralblatt vereinigt mit Tharandter forstliches Jahrbuch : Volume 116

Long-term effects of pruning on the trunk of lime and horsechestnut

Content Provider	Springer Nature Link
Author	Dujesiefken, Dirk Stobbe, Horst Eckstein, Dieter
Copyright Year	1998
Abstract	Es wurden die Wundreaktionen nach Astring- und stammparallelem Schnitt an neun bzw. zehn Jahre alten Astungswunden an zwei unterschiedlich effektiv kompartimentierenden Baumarten, Linde und Roßkastanie, untersucht.Bei allen Bäumen waren die Astringschnitte stärker überwallt, zeigten geringere Kambialnekrosen und weniger Verfärbungen im Holz als die stammparallelen Schnitte. Die Linden schotteten die Wunden engräumiger ab als die Roßkastanien, wobei diese Unterschiede mit zunehmendem Astdurchmesser größer wurden.Die Ausbreitung des Pilzbefalls in der Verfärbung wurde von einer Grenzschicht unterschiedlich effektiv abgeschottet. Insbesondere bei größeren Astungswunden und vor allem bei der schwächer kompartimentierenden Roßkastanie zeigten sich in der Verfärbung alte, von Mikroorganismen durchbrochene und funktionslos gewordene Grenzschichten. Die vordringenden Mikroorganismen führten zur Vergrößerung von Verfärbung und Fäule und zur Bildung einer neuen Grenzschicht. Die Kompartimentierung ist somit, besonders bei größeren Wunden, kein statischer Zustand, sondern ein dynamischer Vorgang, der mit steigendem Astdurchmesser überlinear zunimmt.Für die Baumpflegepraxis folgt hieraus, daß der Astringschnitt für den Baum vorteilhafter ist als der stammparallele Schnitt. Bei schwach kompartimentierenden Baumarten sollten keine Äste von über 5 cm Durchmesser entnommen werden; diese Grenze liegt bei effektiv kompartimentierenden Baumarten bei etwa 10 cm. Bei dickeren Ästen sind trotz korrekter Schnittführung umfangreiche Verfärbungen mit Pilzbefall im Stamm zu erwarten.The wound reactions of large-leafed and small-leafed lime (Tilia platyphyllos Scop. andT. cordata Mill.) and horsechestnut (Aesculus hippocastanum L.), tree species with different compartmentalization capacities, were examined nine/ten years after pruning.Pruning cuts, where the branch collar remained, in all trees exhibited more callus growth, less cambial dieback and a smaller extension of wood discoloration than did flush cuts. The lime trees compartmentalized the wounds more effectively than the horsechestnuts, with differences becoming larger with increasing branch diameters.The marginal zone restricted the spread of fungal infestation within the discoloration with varying effectiveness. In particular, larger pruning wounds and above all weak compartmentalizers like horse-chestnut showed inside the discoloration old marginal zones, penetrated by microorganisms, with the result of extended discoloration and decay. Such marginal zones obviously no longer have any function and are replaced by a new one. The compartmentalization of wounds is not a static condition, particularly in the case of large wounds, but rather a dynamic reaction which runs exponentially with increasing branch diameter.For arborists it can be concluded that for proper pruning the branch collar should not be removed from stem. Tree species with weak compartmentalization should not be pruned if the branch diameter exceeds 5 cms. In the case of trees which compartmentalize effectively the limit is 10 cms. Pruning of thicker branches causes extensive discoloration and decay in the trunk even when the cuts are made correctly.
Starting Page	305
Ending Page	315
Page Count	11
File Format	PDF
ISSN	00158003
Journal	Forstwissenschaftliches Centralblatt vereinigt mit Tharandter forstliches Jahrbuch
Volume Number	117
Issue Number	1-6
e-ISSN	14390337
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	1998-12-01
Publisher Place	Berlin, Heidelberg
Access Restriction	Subscribed
Subject Keyword	Tree care pruning long-term wound effects Forestry Plant Sciences Plant Ecology
Content Type	Text
Resource Type	Article
Subject	Plant Science Forestry

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