Abstract:The stable-carbon isotope ratio (()~(13)C/()~(12)C) of tree rings is an important proxy to research past climate change. Frequently, δ~(13)C has been measured on the cellulose component of wood xylem, but the question arises as to whether other wood components or even whole wood, could be analyzed to produce similar results. In this paper, cores were sampled from six Pinus tabulacforms trees at Mountain Helan, which is located at 38°31′N 105°46′E at an elevation 2400~2500 m above sea level. The area is one...