Abstract
The purpose of this study was to develop site index for Pinus thunbergii in southern region of Korea. Collected data to dominant, or co-dominant 59 trees measures the age, and height was conducted to using five growth models. To verify the accuracy of estimates, models were developed using 40% of the total data and validation data was the remaining 60%. For the verification of the selected model, the fitness index, the root mean square error, and the bias were used. The main results showed that the Gompertz model provided the best fit index, bias, and root mean square error with 0.618, -0.281, 2.266, respectively. The index age of site index derived from Gompertz model choose 50 years, which refer to cutting age for Pinus thunbergii. The site index for Pinus thunbergii in southern region of Korea was range from 16 to 24. The results obtained from this study may provide useful information about the forest management for Pinus thunbergii in southern region of Korea.
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