A guideline for sample preparation in modern tree-ring stable isotope research


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karina.schollaen [ at ] awi.de

Abstract

The comprehensive procedure of wood sample preparation, including tree-ring dissection, cellulose extraction, homogenization and packing for stable isotope analysis, is labour intensive and time consuming. Based on a brief compilation of existing methods, we present a methodological approach from pre-analyses considerations to wood sample preparation, semi-automated chemical extraction of cellulose from tree-ring cross-sections, and tree-ring dissection for stable isotope ratio mass spectrometry: the Cross-Section Extraction and Dissection (CSED) guideline. Following the CSED guideline can considerably increase efficiency of tree-ring stable isotope measurement compared to classical methods<ABS-P>We introduce a user-friendly device for cellulose extraction, allowing simultaneous treatment of wood cross-sections of a total length of 180 cm (equivalent to 6 increment cores of 30 cm length) and thickness of 0.6–2.0 mm. After cellulose extraction, treering structures of 10 tree species (coniferous and angiosperm wood) with different wood growth rates and treering boundaries, largely remained well identifiable. Further, we demonstrate that tree rings from cellulose cross-sections can be dissected at annual to intraseasonal resolution, utilizing simple manual devices as well as sophisticated UV-laser microdissection microscopes in a way that sample homogenization is no longer necessary in most cases. We investigate seasonal precipitation signals in high-resolution intra-annual δ18O cellulose values from African baobab, performed by using UV-laser microdissection microscopes.



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Scopus/ISI peer-reviewed
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Published
Eprint ID
44995
DOI 10.1016/j.dendro.2017.05.002

Cite as
Schollaen, K. , Baschek, H. , Heinrich, I. , Slotta, F. , Pauly, M. and Helle, G. (2017): A guideline for sample preparation in modern tree-ring stable isotope research , Dendrochronologia, 44 , pp. 133-145 . doi: 10.1016/j.dendro.2017.05.002


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