Laser ablation of tree-ring isotopes: pinpoint precision

0573826 - ÚVGZ 2024 RIV GB eng J - Journal Article
Marshall, John David
Laser ablation of tree-ring isotopes: pinpoint precision.
Tree Physiology. Roč. 43, č. 5 (2023), s. 691-693. ISSN 0829-318X. E-ISSN 1758-4469
Research Infrastructure: CzeCOS IV - 90248
Institutional support: RVO:86652079
Keywords : dendrochronology * annual rings * xylem cell formation cycle * isotopic composition * weather conditions * physiological state * laser ablation * sample preparation * wood density * stable-isotope analysis
OECD category: Plant sciences, botany
Impact factor: 4, year: 2022
Method of publishing: Open access
https://academic.oup.com/treephys/article/43/5/691/7048652?login=false

Dendrochronology relies on the annual rings of trees as a historical record precisely dated by the xylem cell formation cycle. While ring widths have been extensively studied, the isotopic composition of the cell-wall material offers valuable insights into weather conditions and tree physiology during growth. However, obtaining high-quality isotope data has been challenging and expensive. Laser ablation, a promising technique introduced two decades ago, has recently shown significant progress with advancements presented by Saurer et al. (2022). This study describes two systems used in Switzerland and Finland, detailing their performance and comparing sample preparation methods. Laser ablation enables precise sampling positions on tree rings, providing advantages in dendrochronology where space reflects time. Additionally, this non-invasive technique allows the analysis of high-value or irreplaceable wood samples. The study also explores the conversion of ablated material to CO2, enabling isotopic analysis of both carbon and oxygen, further enhancing climate and physiological reconstructions. The beam strength of laser ablation was found to correlate with wood density, suggesting potential applications in detecting short-term density fluctuations caused by drought events. Moreover, laser ablation facilitates pulse-chase studies with stable-isotope labels, offering new insights into carbon allocation within wood across growing seasons and changing environmental conditions. Overall, the advancements in laser ablation present an opportunity for efficient adoption and standardization of this technique in dendrochronological research.
Permanent Link: https://hdl.handle.net/11104/0344175