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Age determination of coarse woody debris with radiobarbon analysis and dendrochronological cross-dating

Titelangaben

Krüger, Inken ; Muhr, Jan ; Hartl-Meier, Claudia ; Schulz, Christoph ; Borken, Werner:
Age determination of coarse woody debris with radiobarbon analysis and dendrochronological cross-dating.
In: European Journal of Forest Research. Bd. 133 (2014) Heft 5 . - S. 931-939.
ISSN 1612-4677
DOI: https://doi.org/10.1007/s10342-014-0810-x

Abstract

To study the decay of coarse woody debris (CWD) in forest ecosystems, it is necessary to determine the time elapsed since tree death, which is difficult at advanced decay stages. Here, we compare two methods for age determination of CWD logs, dendrochronological cross-dating and radiocarbon analysis of the outermost tree ring. The methods were compared using samples from logs of European beech, Norway spruce and Sessile oak decomposing in situ at three different forest sites. For dendrochronological cross-dating, we prepared wood discs with diameters of 10–80 cm. For radiocarbon analysis, cellulose was isolated from shavings of the outermost tree rings. There was an overall good agreement between timeof death determined by the two methods with median difference of 1 year. The uncertainty of age determination by the radiocarbon approach did not increase with decreasing carbon density, despite incomplete separation of chitinfrom the extracted cellulose. Fungal chitin has the potentialto alter the radiocarbon signature of tree rings as the carbon for chitin synthesis originates from different sources. Significant correlations between year of tree death and carbon density of wood were found for beech and spruce, but not for oak due to relatively small decreases in carbon densitywithin 50–60 years. Total residence times of CWD were calculated from these correlations and revealed 24 years for beech and 62 years for spruce. The uncertainty of total residence times results mainly from huge natural variability in carbon density of CWD rather than uncertainty in the age determination. The results suggest that both methods are suitable for age determination of CWD. Keywords: Radiocarbon, Coarse woody debris, CWD, dendrochronological cross-dating, cellulose extraction, time of tree death

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Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Zusätzliche Informationen: BAYCEER115337
Institutionen der Universität: Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften > Lehrstuhl Bodenökologie
Forschungseinrichtungen > Forschungszentren > Bayreuther Zentrum für Ökologie und Umweltforschung - BayCEER
Fakultäten
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften
Forschungseinrichtungen
Forschungseinrichtungen > Forschungszentren
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 500 Naturwissenschaften und Mathematik
Eingestellt am: 07 Aug 2015 06:59
Letzte Änderung: 07 Aug 2015 06:59
URI: https://eref.uni-bayreuth.de/id/eprint/17634