dendrochemical data from PCCVC
Description
This dataset contains concentrations of 15 trace elements in micro-grams per gram (µg/g), analyzed using ICP-MS in tree rings of Nothofagus pumilio, a tree species from the Andean region of Northern Patagonia. The analyzed elements include: Na, Mg, Al, K, Ca, Cr, Mn, Fe, Co, Ni, Cu, Zn, Se, Cd, and Ba. The data were obtained from tree ring samples of N. pumilio collected after two major volcanic eruptions of the Puyehue-Cordón Caulle Volcanic Complex (PCCVC) in 1921-22 and 2011. These results provide information on the concentrations of these elements in the trees' xylem, helping to understand the effects of volcanic eruptions and the biochemical processes that occur in trees after tephra fall. Data File: The concentration values for each element per sample, expressed in µg/g. Year: Year corresponding to the tree ring. Sapwood from 1916 to 1926; heartwood from 2005 to 2013. Location: Geographical location of the samples: 40°42'14" S, 71°57'31" W. Purpose of the data: These data can be used to study dendrochemical variations in Nothofagus pumilio trees, especially in response to volcanic eruptions, and to reconstruct past volcanic events based on the chemistry of tree rings. Expected Use: Researchers can use this data to assess how volcanic eruptions affect the absorption and distribution of trace elements in trees, providing new insights into the interaction between the environment and plants. These data can also be useful in studies of biogeography, climate change, and the biogeochemical cycling of elements in forest ecosystems.
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Steps to reproduce
Each segment was cut under binocular microscopy using a ceramic blade and polished with diamond tools to remove the surface that was in contact with the extraction and sanding tools. The samples were then sent to the Arizona Laboratory for Emerging Contaminants (ALEC) at the University of Arizona for chemical measurements. At ALEC, samples were weighed into pre–cleaned, weighed, and trace metal–free polypropylene centrifuge tubes. Then 3 mL of 70% nitric acid was added for predigestion for 24 hours at room temperature, while complete digestion was performed at 90° temperature for 1 hour in a thermal digestion block system. After digestion, sample tubes containing the digestate were reweighed to calculate dilution factors. Subsequently, ultrapure water of 18.2 MΩ/cm from a Milli–Q system was added to each tube to complete the 15 mL and a second procedure to obtain a dilution factor of approximately 10. For the measurement of major cations, the dilution factor was approximately 100. To check the accuracy of the analytical procedures, pine needles were also measured as standard reference material (NIST 1575a) as well as a blank. Finally, all liquid samples were analyzed using a 7700 ICP–MS system.