Biological and topochemical studies on the resistance of excavated oak piles (Quercus sp.) from a historical bridge in Bavaria
Author:
Koch Gerald1, Melcher Eckhard1, Lenz Marie-Therese2, Bauch Josef2
Affiliation:
1. Thünen Institute of Wood Research , Leuschnerstr. 91 , 21031 Hamburg , Germany 2. Department of Wood Biology , Center for Wood Science, University of Hamburg , Leuschnerstr. 91 , 21031 Hamburg , Germany
Abstract
Abstract
Archaeological wood of 13 excavated oak piles from five historical bridge generations in Bavaria, dated from 1447 to 1787, was investigated by means of light microscopy (LM) and cellular UV-microspectrophotometry (UMSP) to study the ageing and natural resistance of the excavated wood. Furthermore, the mineral content of the ancient wood was determined to evaluate the impact of mineral inclusions on microbial resistance, tested using a mini block fungal test. The LM and UMSP analyses revealed well preserved cell wall structures and no significant modification of the lignin composition and distribution in predominant parts of the piles. Slight microbial decay caused by soft rot and erosion bacteria was only detectable at the outermost millimetres of individual piles. The fungal mini block tests yielded mass losses of ancient oak samples between 15% and 30%, independent of their analysed mineral content. The results provided evidence that the fungal resistance of the investigated ancient wood is mainly determined from the special soil with its high mineral content.
Publisher
Walter de Gruyter GmbH
Reference52 articles.
1. Almkvist, G., Norbakhsh, S., Bjurhager, I., Varmuza, K. (2016) Prediction of tensile strength in iron-contaminated archaeological wood by FT-IR spectroscopy – a study of degradation in recent oak and Vasa oak. Holzforschung 70:855–865. 2. Andersons, B., Noldt, G., Koch, G., Andersone, I., Meija-Feldmane, A., Biziks, V., Grinins, J. (2016) Scanning UV microspectrophotometry as a tool to study the changes of lignin in hydrothermally modified wood. Holzforschung 70:215–221. 3. Bauch, J., Eissing, T., Bauch, H., Rehm, H. (2012/2013) Dendrochronologische Untersuchung von Eichenpfählen historischer Brücken in Dollnstein/Altmühl. Jahrbuch Bayerischen Denkmalpflege Band 66/67:27–36. 4. Bianchi, S., Koch, G., Janzon, R., Mayer, I., Saake, B., Pichelin, F. (2016) Hot water extraction of Norway spruce (Picea abies [Karst.]) bark: analyses of the influence of bark aging and process parameters on the extract composition. Holzforschung 70:619–631. 5. Björdal, C.G., Daniel, G., Nilsson, T. (2000) Depth of burial, an important factor in controlling bacterial decay of waterlogged archaeological poles. Int. Biodeterior. Biodegrad. 45:15–26.
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