Evaluating similarity of radial increments around tree stem circumference of European beech and Norway spruce from Central Europe

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Abstract

Extracting cores from a tree using an increment borer has been standard practice in dendrochronological studies for a long time. Although empirical rules exist regarding how many samples to take and which methodology to apply, comparatively few studies provide quantification of the similarity of relative tree-ring-widths (TRW) around the stem circumference. The aim of this study was therefore to precisely measure the similarity of standardised TRWs around the stem circumference and to provide objective suggestions for optimal core sampling of Norway spruce (Picea abies Karst. [L.]) and European beech (Fagus sylvatica L.) growing in Central European temperate forests. A large sample of cross-sectional discs was used from Norway spruce and European beech trees growing on various slopes, at different altitudes and biogeographic regions across the Czech Republic and Slovakia. The similarity of TRWs measured in different coring directions was analysed by testing the relativized TRW around the trunk (rTRW). Comparison of rTRWs revealed no significant differences between coring directions, indicating that the relative increment was the same around the radius. The results also showed the high similarity between the rTRWs to be independent of both slope inclination and altitude. Moreover, the reconstruction of proportional tree diameters and basal areas backward in time from one core sample and one measurement of tree diameter (basal area) at the time of sample extraction is possible with reasonable precision. © 2013 Versita Warsaw and Springer-Verlag Wien.

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Bošeľa, M., Sedmák, R., Marušák, R., Sedmáková, D., Petráš, R., & Barna, M. (2014). Evaluating similarity of radial increments around tree stem circumference of European beech and Norway spruce from Central Europe. Geochronometria, 41(2), 136–146. https://doi.org/10.2478/s13386-013-0152-3

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