In this talk, I would like to introduce four topics, (1) how we sample increment cores by using cordless impact wrench, (2) how to estimate the geographic origin of wood using tree-ring carbon and oxygen isotopes, (3) how to make the cellulose extraction process for tree-ring isotope analysis more efficient, and (4) how spring, summer and autumn photoassimilates are used for tree-ring formation.
References:
(1) Kagawa, A., & Fujiwara, T. (2018). Smart increment borer: a portable device for automated sampling of tree-ring cores. Journal of Wood Science, 64(1), 52–58.
(2) Kagawa, A., & Leavitt, S. W. (2010). Stable carbon isotopes of tree rings as a tool to pinpoint the geographic origin of timber. Journal of Wood Science, 56(3), 175–183.
(3) Kagawa, A., Sano, M., Nakatsuka, T., Ikeda, T., & Kubo, S. (2015). An optimized method for stable isotope analysis of tree rings by extracting cellulose directly from cross-sectional laths. Chemical Geology, 393, 16–25.
(4) Kagawa, A., Sugimoto, A., & Maximov, T. C. (2006). ¹³CO₂ pulse‐labelling of photoassimilates reveals carbon allocation within and between tree rings. Plant, Cell & Environment, 29(8), 1571–1584.