The suitability of annual tree growth rings as environmental archives: Evidence from Sr,Nd, Pb and Ca isotopes in spruce growth rings from the Strengbach watershed |
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| Authors: | Peter Stille Anne-Désirée Schmitt François Labolle Marie-Claire Pierret Sophie Gangloff Florian Cobert Eric Lucot Florence Guéguen Laure Brioschi Marc Steinmann François Chabaux |
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| Institution: | 1. LHyGeS-UMR7517, EOST, INSU/CNRS, université de Strasbourg, 1, rue Blessig, 67000 Strasbourg, France;2. UMR 6249 chrono-environnement, université de Franche-Comté, 25030 Besançon, France;3. Institut de zoologie et de biologie générale, université de Strasbourg, 12, rue de l’Université, 67000 Strasbourg, France |
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| Abstract: | The combination of the Sr, Nd and Pb isotope systems, recognized as tracers of sources, with the Ca isotope system, known to reveal biology-related fractionations, allowed us to test the reliability of spruce (Picea abies) growth rings as environmental archives through time (from 1916 to 1983) in a forest ecosystem affected by acid atmospheric deposition. Sr and Pb isotopes have already been applied in former tree-ring studies, whereas the suitability of Nd and Ca isotope systems is checked in the present article. Our Sr and Nd isotope data indicate an evolution in the cation origin with a geogenic origin for the oldest rings and an atmospheric origin for the youngest rings. Ca isotopes show, for their part, an isotopic homogeneity which could be linked to the very low weathering flux of Ca. Since this flux is weak the spruces’ root systems have pumped the Ca mainly from the organic matter-rich top-soil over the past century. In contrast, the annual growth rings studied are not reliable and suitable archives of past Pb pollution. |
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| Keywords: | Annual tree growth rings Pb-Nd-Sr-Ca isotopes Atmosphere Soil acidification Soil solutions |
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