Limits and Strengths of Tree-Ring Stable Isotopes

Abstract This chapter aims at summarizing strengths and caveats on the suitability of stable carbon oxygen isotopes in tree rings as recorders for fingerprints environmental influences. First, constraints limiting growth shaping species distribution worldwide are discussed. Second, examples presented conditions under which tree-ring record signals particularly well, but also cases where physiological processes can mask climate signals. Third, link between leaf-level assimilation investment assimilates stem during annual ring formation discussed light resulting deviations isotopic values leaves rings. Finally, difficulties pitfalls interpretation isotope reviewed. These problems often result from a poor understanding when how canopy, stems roots physiologically interconnected. Current literature suggests that photosynthesis radial only loosely coupled, if all, challenging recorded isotopes. Harsh (e.g. low temperatures, drought) decoupling growth. The closes by providing possible solutions to improve detection information integrating scales different methodological approaches.