본 연구는 우리나라 곰솔 현실림의 생장특성을 반영한 지위지수곡선을 개발하고자 최근 산림자원조사를 통해 획득한 493 plots의 곰솔 임분 자료를 수집하여 진행되었다. 수고생장모델 개발을 위해 생장추정에 널리 쓰이고 있는 Chapman-Richards, Schumacher, Gompertz 및 Weibull 대수차분방정식을 적용한 결과, 적합도가 가장 높은 Weibull식을 수고 생장모델에 대한 최적합식으로 선정하였으며, 유도곡선법을 이용하여 지위지수 곡선을 개발하였다. 개발된 해안⋅내륙 각각의 곰솔 지위지수 분류곡선을 이용하여 임령에 따른 독립된 두 집단의 우세목 수고생장을 비교 분석한 결과, 임령 50년 이후에서 유의적 차이가 있는 것으로 나타났다(p<0.05). 따라서 본 연구는 변화된 곰솔 현실림의 생장특성을 반영한 지위지수를 통해 지역 간 생장특성 차이를 구명함으로써 지역별 맞춤형 임분관리계획 수립 시 활용가치가 더욱 기대되는 바이다.

This study was carried out to provide basic data for logical forest management by developing a site index curve reflecting the current growth characteristics of Cryptomeria japonica stands in Korea. The height growth model was developed using the Chapman-Richards, Schumacher, Gompertz, and Weibull algebraic difference equations, which are widely used in growth estimation, for data collected from 119 plots through the 7th National Forest Inventory and stand survey. The Chapman-Richards equation, with the highest model fit, was selected as the best equation for the height growth model, and a site index curve was developed using the guide curve method. To compare the developed site index curve with that on the yield table, paired T-tests with a significance level of 5% were performed. The results indicated that there were no significant differences between the site index curve values at all ages, and the p-value was smaller after the reference age than before. Therefore, the site index curve developed through this study reflects the characteristics of the changing growth environment of C. japonica stands and can be used in accordance with the site index curve on the current yield table. Thus, this information can be considered valuable as basic data for reasonable forest management.