본 연구는 국내 사스레피나무 군락의 임지생산력 평가를 위한 지위지수 추정식 개발과 입지환경인자와의 수량화 분석으로 적지 선정 기준을 마련하고자 수행하였다. 경남과 전남 지역에서 총 18개 표준지를 조사한 결과, 평균 임령은 13년, 흉고직경은 2.7 cm, 수고는 3.6 m였다. 지위지수 추정을 위해 Chapman-Richards와 Schumacher 모델을 적용하였으며, 기준임령은 수고 생장의 안정화 시기인 20년으로 설정하여 분석하였다. 두 모델에 대한 적합도 지수(FI), 표준오차(SEE), 편의(bias), 잔차(residuals)를 종합적으로 검토한 결과 Schumacher 모델이 최적 모형으로 선정되었 다(FI=0.4074, SEE=1.5624, bias=–0.0034). 또한 사스레피나무 군락의 지위지수와 입지환경인자 간 수량화 분석 결과, 모형의 설명력은 R²=0.8918 (유의수준 1%)로 나타났다. 다만 지위지수에 실제적으로 영향을 미치는 설명변수는 다중공선성을 제거한 편상관계수를 통해서만 확인할 수 있었다. 그 결과 토심(r=0.3890)과 경사도(r=0.2265)가 5% 수준에서 통계적으로 유의하게 나타났고, 사면 방위는 통계적 유의성이 나타나지 않았다.

This study was conducted to develop the effects of site environmental factors on estimation of site index function for Chamaecyparis obtusa Endlicher stands. We derived nonlinear growth equation and the draw site index curves by applying this estimated equation. This study with Chapman-Richards function showed significant P-value which was less then 0.0001 and R2 value 0.5947. This study was conducted to develop the feasible site index equation of Chamaecyparis obtusa Endlicher. For the table, the data of 82 sample areas that were thought to be without errors among the data of Chamaecyparis obtusa Endlicher sample area located on the value-oriented forest location chart were used and estimated. After analyzing the quantification method I based on 13 environmental factors to develop the score table for the site-index estimation of Chamaecyparis obtusa Endlicher, R2 value of the model was 0.7555. It has been analyzed that the scope value of Soil moisture in horizon A was 7.5045, that of total soil depth was 6.3896, that of topography was 5.3471, that of slope was 4.7000 and that of aspect was 3.2038. After analyzing the partial correlation to examine the factors that affected most the site-index of Chamaecyparis obtusa Endlicher, it has been noted that the partial correlation of climatic zone was 0.4987, which was highest, and it was followed by Soil moisture in horizon A (0.4592), slope (0.4537), topography (0.3299) and total soil depth (0.1035). As a result of conducting the significance test for partial correlation, it has been found that topography, climatic zone, parent rock, slope, altitude, aspect, Soil moisture in horizon A, soil hardness in horizon A and total soil depth were recognized significant with 1% of significance level and sedimentary type and soil texture in horizon A were recognized significant with 5% of significance level.