This study was conducted to develop local stem volume tables reflecting the local growth pattern and climate condition using stem taper equations for Pinus rigida. We developed the local stem volume table for P. rigida, which is the widely planted species following Pinus denisflora and Larix kamepferi in South Korea. Three Functions of Max & Burkhart, Kozak and Parresol et al. were applied and compared to derive the most suitable taper function. Their suitability was statistically analyzed by using the Fitness Index, Bias and Standard Error of Bias. The result showed that there was a significant difference in all three functions, and the Fitness Index of the Kozak’s function was the highest among the three functions for estimating the tree growth pattern of P. rigida. Therefore, the Kozak’s function was chosen for generating stem taper equation and local stem volume tables for P. rigida. The developed stem volume tables of each region were compared to the standard stem volume table that was driven by the data of tree growth obtained throughout the nation. The result showed that the local stem volume table was higher than standard volume tables in two regions of Muju and Boeun. There was a statistically significant difference (p<α=0.05), but there was no significant (p >α=0.05) between the local stem volume.

본 연구는 제주시험림 일대의 삼나무 임분을 대상으로 간곡선식을 추정하여 임목의 간재적표를 작성하였다. 조사대상지는 제주시험림 내 삼나무조림지에서 임분을 대표할 수 있는 표준지를 선정하여 직경이 골고루 분포하도록 총 20그루의 표본목을 공시목으로 사용하였다. 본 연구에서 간곡선식은 Kozak 모형을 이용하여 모수를 추정하였다. 추정된 모형의 적합성 지수는 99%, 오차는 0.008, 절대평균편차는 0.832로 나타났다. 본 연구에서 제시된 삼나무림 간재적표는 제주도 지역에 분포하고 있는 삼나무림의 합리적 경영을 위한 정보를 제공해 줄 것으로 사료된다.

본 연구는 난대산림연구소의 제주시험림에 있는 서어나무 (Carpinus laxiflora)에 대한 개체목의 수간곡 선식 추정 및 재적표를 개발하기 위하여 수행하였다. 최적의 추정식을 선택하기 위하여 Max & Burkhart 식, Kozak식 및 Lee식을 적용하여 수간곡선식을 유도한 후, 각 식의 직경 추정에 대한 검정 통계량 및 실측치와 추정치간의 오차분포를 검증하였다. 그 결과 Max & Burkhart식 및 Lee식이 특정 구간에서 과대 치 또는 과소 추정치를 보인데 반하여 Kozak식은 전구간에서 고른 분포를 보였다. 추정력이 가장 좋은 Kozak식을 활용하여 수피포함 재적표를 작성하였다.

This study was conducted to provide data and stem information to establish a local volume table of Cryptomeria japonica in Jeju Island. Stem analysis was performed on 26 trees by selecting two average trees from each site of the 13 plots of C. japonica stands in 2021 and 2022. During the analysis stage, one outlier tree was rejected, and a total of 260 observations of the specific stem height of 25 trees were used. Of the seven major taper equation models applied for parameter estimation and statistical verification, the Muhairwe 1999 model was found to be the best fit and selected as the optimal model. Stem shape-related estimates were acquired through the selected model, and sectional measurements according to the Smalian formula applied at an interval of 10 cm from the height of the stem were used to develop a volume table. A paired t-test comparison between the C. japonica volume obtained from the present study and those selected from the current yield table by NIFoS(2020), revealed significant differences (p<0.05), highlighting the necessity of a local volume table for C. japonica in Jeju Island.