Co-occurring species differ in tree-ring delta(18)O trends.

  title={Co-occurring species differ in tree-ring delta(18)O trends.},
  author={John David Marshall and Robert A. Monserud},
  journal={Tree physiology},
  volume={26 8},
The stable oxygen isotope ratio (delta(18)O) of tree-ring cellulose is jointly determined by the delta(18)O of xylem water, the delta(18)O of atmospheric water vapor, the humidity of the atmosphere and perhaps by species-specific differences in leaf structure and function. Atmospheric humidity and the delta(18)O of water vapor vary seasonally and annually, but if the canopy atmosphere is well mixed, atmospheric characteristics should be uniform among co-occurring trees. In contrast, xylem water… CONTINUE READING