Climate change has the potential to alter the structure, composition, and function of forest ecosystems. In northern Arizona, climate change is predicted to increase the frequency and intensity of drought. A better understanding of tree species responses to past variation in climate, including drought, could provide insight into future forest responses to climate change. In this project, we investigated within- and among-species differences in drought sensitivity and climate-growth relationships of trees using tree-ring measurements. We sampled trees of 8 different species and at 24 sites on and around the San Francisco Peaks.
  This website makes available site location, soil data, slope, aspect, and forest basal area information for each site used in the study. At each site in the study, species-specific tree-ring measurements are available for download. These files contain raw ring-width measurements, not standardized (not detrended) for the effects of tree age and geometry. The ring width list (.rwl) files are in Tucson decadal format required for use with tree-ring software such as programs COFECHA and ARSTAN, available from the International Tree-Ring Data Bank.
  This project was completed as part of the requirements of Henry Adams’ MS degree in the School of Forestry at Northern Arizona University, with Dr. Thomas E. Kolb advising. This research was supported by the McIntyre-Stennis Program and the School of Forestry. Results of this research were published as:

Adams HD and Kolb TE. 2004. Drought responses of conifers in ecotone forests of northern Arizona: tree ring growth and leaf δ13C. Oecologia 140:217-225.

Adams HD and Kolb TE. 2005. Tree growth response to drought and temperature in a mountain landscape in northern Arizona, USA. Journal of Biogeography 32:1629-1640.