Abstract
This experiment was carried out to investigate the effects of physico-chemical properties of soil on the growth of Chamaecyparis obtusa and to apply the results to such rational forest management as yield forecast and selection of suitable species for a given forest stand. The soil properties observed in this experiment were soil pH, exchangeable pH organic matter, total nitrogen, available $P_2O_5$, cation exchange capacity, exchangeable $H^+$, total base and base saturation. Diameter at breast height (DBH), height and volume growth of C. obtusa were observed at 78 sampling sites. Data were processed into the following series for the analysis of multivariates : inner correlation matrix, multiple correlation coefficients, regression coefficients and partial correlation coefficients. The results are summerized as follows : 1. Multiple correlation coefficients between soil properties and DBH of C. obtusa were .364 for 20-year trees, resulting less efficient for estimating the growth of C. obtusa. However, total base, soil pH and base saturation were considerable characters for better estimation. 2. More efficient multiple correlation coefficients were observed between soil properties and height growth than those between soil properties and DBH, showing .443 for 20-year trees and factors affecting the height growth were similar to those of DBH. 3. Extremely low values of multiple correlation coefficients were estimated between physico-chemical properties of soil and volume growth of C. obtusa resulting low efficient estimation. However, total base contributed highly to volume growth of C. obtusa. Accordingly the most contributable factor for estimating the growth of C. obtusa were total base, soil pH and base saturation. Consequently, these results can be effective for selecting of the reforesting site, and less effective for estimating the growth of C. obtusa.
본연구(本硏究)는 토양(土壤)의 이화학적성질(理化學的性質)이 임목생장(林木生長)에 미치는 영향(影響)의 정도(程度)를 구명(究明)하여 적지(適地) 적수조림(適樹造林), 삼림생산예측(森林生産豫測) 등 합리적(合理的)인 임업경영(林業經營)을 유도(誘導)하고져 실시(實施)되었다. 대상수종(對象樹種)은 편백나무림(林) 78 plots를 선정(選定)하였다. 조사분석(調査分析)된 토양(土壤)의 이화학적성질(理化學的性質)은 토양(土壤)pH, 치환(置換)pH, 유기물(有機物), 전질소(全窒素), 유효(有效)$P_2O_5$, 치환성(置換性)$H^+$, 염기총량(塩基總量) 및 염기포화율(塩基飽和率)이며 흉고직경(胸高直徑), 수고(樹高) 및 재적생장량(材積生長量)을 외적기준(外的基準)으로 하였다. 측정치(測定値)의 통계적(統計的) 분석(分析)은 내부상관행열(內部相關行列), 중상관계수(重相關係數), 중회귀계수(重回歸係數), 편상관계수계산(偏相關係數計算) 과정(過程)으로 실시(實施)되어졌으며 결과(結果)를 요약(要約)하면 다음과 같다. 1. 토양(土壤)의 이화학적성질(理化學的性質)과 편백나무 흉고직경생장량(胸高直徑生長量)과의 회귀관계(回歸關係)에서 중상관계수(重相關係數)는 .364로서 추정효율(推定效率)이 낮았다. 그러나 염기총량(塩基總量), 토양(土壤)pH 그리고 염기포화율(塩基飽和率)은 임목생장(林木生長)에 기여(寄與)하고 있는 인자(因子)로 나타났다. 2. 수고생장량(樹高生長量)과 토양성질(土壤性質)과의 중상관계수(重相關係數)는 .443이며 관여인자(關與因子)는 흉고직경(胸高直徑)에 대(對)한 경우와 유사(類似)한 경향(傾向)을 나타내었다. 3. 재적생장량(材積生長量)과의 관계추정효율(關係推定效率)은 극(極)히 낮으나 염기총량(塩基總量)이 편백나무의 재적생장(材積生長)에 관여(關與)하는 인자(因子)로 나타났다. 따라서 편백나무생장(生長)에 관여(關與)하는 인자(因子)는 염기총량(塩基總量), 토양(土壤)pH, 염기포화율순(塩基飽和率順)이며, 토양(土壤)의 이화학적성질(理化學的性質)에 의(依)한 재적생장량(材積生長量) 추정효율(推定效率)은 극(極)히 낮으나 무입목지(無立木地)의 조림지(造林地) 선정(選定) 등에는 유용(有用)할 것으로 판단(判斷)된다.