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Trees

, Volume 24, Issue 5, pp 797–808 | Cite as

Analysing the long-term effects of artificial pruning of wild cherry by computer tomography

  • Thomas SeifertEmail author
  • Martin Nickel
  • Hans Pretzsch
Original Paper

Abstract

The wild cherry (Prunus avium L.) is a species that does not exhibit fast natural pruning. Artificial pruning is consequently a prerequisite for the production of valuable timber, which is at the same time often accompanied by unwanted decay that decreases wood quality. This study aims to reveal the factors affecting the speed of branch stub occlusion, and the relationship between stub occlusion and the subsequent formation of decay within stem wood. For this study, 11- and 23-year-old wild cherry trees with documented pruning history were sampled at two experimental sites in Bavaria with varying site class, spacing and thinning variants. The wood structure of the specimens was analysed by computer tomography (CT scanning), which allows for the examination of occlusion of pruned knots as well as the presence of decay. No significant differences between the branch diameters determined by CT scanning and manual measurement were found, proving the reliability of measurements from CT scans. Decay reduced the wood density by 40–60% compared to sound wood. Even small fluctuations in wood density caused by decay that were not visually recognisable could be detected in the CT images. The results suggest that the speed of stub occlusion is significantly positively affected by the diameter growth of the tree stem. The average wound occlusion was 1.3 mm per 1 mm stem diameter growth with a significant difference between sites. A relation between stub occlusion duration and the presence of decay was also found. Serious decay was detected after 3 years on the better, and after 4 years on the less favourable site. Based on these results, reliable pruning recommendations could be derived with regards to maximum branch diameter for pruning depending on a tree’s specific diameter growth, without risking severe stem decay.

Keywords

Prunus avium CT scanning Wound occlusion Stub occlusion Decay Guidelines for pruning Non-destructive testing of wood 

Notes

Acknowledgments

The authors wish to thank the Deutsche Forschungsgemeinschaft DFG for providing funds for forest growth and yield research as part of the Sonderforschungsbereich SFB 607 “Growth and Parasite Defense”, the Bavarian State Ministry for Agriculture and Forestry for permanent support of the project W 07 “Long-term experimental plots for forest growth and yield research”, and Siemens AG for the generous donation of the CT scanner for forest science purposes. We also wish to express our gratitude to Dr Martina Meincken from the Department of Forest and Wood Science, Stellenbosch University, for her helpful comments on the manuscript and Mr William Esler and Mr Iain Cottontail for the language revision. We also wish to thank the two anonymous reviewers for their helpful comments.

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Copyright information

© Springer-Verlag 2010

Authors and Affiliations

  1. 1.Department of Forest and Wood ScienceStellenbosch UniversityMatielandSouth Africa
  2. 2.Chair of Forest Growth and Yield ScienceTechnische Universität MünchenFreisingGermany

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