남부지방 해송의 지위지수 추정
Estimation of site index for Pinus thunbergii in southern region of Korea
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초록
본 연구의 목적은 우리나라 남부지역 해송에 적합한 지위지수를 개발하는데 있다. 남부지역에 분포하는 해송림을 대상으로 우세목과 준우세목의 수고와 임령을 측정하였다. 5개의 생장모형을 비교하고 수집된 자료에서 40%는 모형의 개발, 나머지는 모형의 검정에 이용하였다. 지위지수식의 개발을 위한 생장모형의 적합도는 적합도 지수, 편차, 평균오차제곱근을 이용하였다. 남부 지방 해송의 지위지수 추정을 위하여 5종의 생장모형을 비교한 결과, Gompertz 식에서 높은 적합도를 보였으며 적합도 지수, 편차, 평균오차제곱근은 각각 0.618, -0.281, 2.266으로 나타났다. Gompertz 모형을 이용하여 지우지수를 유도하고 기준임령은 해송 벌기령을 고려하여 50년으로 정하였다. 남부지방 해송의 지위지수(기준임령 50년)는 16에서 24의 범위를 나타내었다. 본 연구는 남부지역 해송의 경영에 기초 정보를 제공할 것으로 판단된다.
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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