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CORRELATION ANALYSIS OF RAINFALL AND ANNUAL RING INDEX OF CENTRAL OKLAHOMA BLACKJACK AND POST OAK

A B S T R A C T Yearly ring-width indices were determined for Quercus stellata and Q. marilandica in central Oklahoma for the period 1892-1971 and were used as dependent variables in correlation analyses with corresponding series of previous growth rates and various precipitation totals as independent variables. Results of multiple correlation show that approximately 60% of the variance in ring indices of both species can be accounted for by precipitation and previous growth rates. Simple linear correlation analysis of precipitation data shows that the ring index value for a year is significantly correlated with rainfall in the current spring and in the previous summer. THIS STUDY represents a continuation of the series