Differences in stem form and bark anomalies of northern red oak trees in forest stands in Canada and Germany

2021 | journal article. A publication with affiliation to the University of Göttingen.

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​Differences in stem form and bark anomalies of northern red oak trees in forest stands in Canada and Germany​
Burkardt, K.; Ammer, C. ; Seidel, D.   & Vor, T.​ (2021) 
Canadian Journal of Forest Research51(11) pp. 1732​-1739​.​ DOI: https://doi.org/10.1139/cjfr-2020-0497 

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Burkardt, Katharina; Ammer, Christian ; Seidel, Dominik ; Vor, Torsten
Northern red oak (Quercus rubra L.) wood is valuable for a variety of applications not only in its natural distribution range in North America but also in Europe. Timber quality and stem diameter largely determine timber prices and respective uses. Silvicultural management is key to influencing tree growth and stem quality. In Germany, crop tree thinning is currently the standard treatment, while in Canada the shelterwood system is common practice. The objective of this study was to compare stem characteristics related to stem quality of northern red oaks from Canada with those from Germany to determine effects of different silvicultural treatments on stem quality. We examined stem characteristics from a total of 150 dominant northern red oaks in Canadian and German forest stands using the terrestrial laser scanning approach. Northern red oak stems in Canada (shelterwood system) were significantly straighter, whereas German stems (crop tree thinning approach) were significantly smoother on the surface and rounder on the upper parts of the stems (height 4–8 m). The number of bark anomalies decreased with increasing tree competition, indicating that competition is the main driver influencing external stem form and the occurrence or persistence of bark anomalies.
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Canadian Journal of Forest Research 
Fakultät für Forstwissenschaften und Waldökologie ; Burckhardt-Institut ; Abteilung Räumliche Strukturen und Digitalisierung von Wäldern ; Abteilung Waldbau und Waldökologie der gemäßigten Zonen 



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