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Tree-ring series can be classified as either complacent (uniform ring widths where moisture and heat are sufficient throughout the growing season) or sensitive (pronounced year to year variation in ring width, where conditions are frequently near the limits of the trees tolerance, e.g. The search for proxy climatic data was the original application of tree rings. In 1901, he noticed ring-width variations on a cut log and reasoned that these were controlled by the tree's environment (Fritts, 1976).Douglass (1920) illustrated the relationship between climate and ring width by plotting both against time, and introduced the technique of cross dating by correlating ring-width signatures (sequences of wide and narrow rings) among trees distributed over large areas.A crossdating program for tree-ring research has been written to compare ring patterns of individual trees and composites.

As the chronologies must be free from errors, the program is more suited to the study of oaks than coniferous trees.It was digitized from a physical copy provided by the Laboratory of Tree-Ring research at The University of Arizona.For more information about this peer-reviewed scholarly journal, please email the Editor of Tree-Ring Research at [email protected] analysis between the verified chronologies and climate data revealed no significant correlation between precipitation and ring width for either species.chronology was significantly correlated with air temperature and frequency of frost during the preceding winter.




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