Abstract
In order to examine the natural distribution variations between groups of the Stewartia koreana, the leaf form characteristics of the investigation sites were analyzed by each group. As a result, the Mt. Kumsan group showed a smaller value in leaf length, width, area, and the number of veins, but not in the petiole length and serration number. Among each character, the coefficient of variation(CV) of the characters excluding petiole length and leaf area was in a comparatively narrow range, from 11.6~17.4%. On the other hand, the CV of petiole length and leaf area between the groups was 34.9% and 28.4% respectively. The CV of these characters within the group was also extraordinary- petiole length showed 29.5~42% and leaf area showed 27.7~40.7%. Also, the simple correlation analysis between 12 leaf characteristics showed that the correlation between leaf width and leaf area was high (r=0.975). The correlations between leaf length and leaf area, between leaf length and leaf width were 0.971 and 0.969, respectively. A negative correlation between angle of leaf base and ratio of leaf length to leaf width was discovered (r= -0.843), meaning that the ratio of leaf length to leaf width decreases as angle of leaf base increases. A cluster analysis was enforced among leaf characteristics of the selected group as a standard on the similarity of quantitative, qualitative measurements. The results showed that at a 0.4 distance level, the subjects could be classified into 4 groups. Group 1 was the Mt. Jogyesan and Mt. Kayasan group, group 2 was Mt. Paegunsan, group 3 was Mt. Unmunsan and Mt. Mudungsan, and group 4 was Mt. Kumsan. At a distance level of 0.6, the subjects were classified into two groups. Group 1 was the Mt. Ktimsan group and group 2 was Mt. Mudungsan, Unmunsan, Paegunsan, Kayasan, and Cogyesan. Especially the Mt. Kumsan group had the smallest value in the leaf characteristics of leaf length, width, area, and the number of veins, showing an obvious difference from the other five groups. There were five principal components that had a meaningful eigenvalue over 1.0 among the 12 extracted components. The explanatory power of the top two main components (leaf length and width) on the total variation was 52.7%. The explanatory power was 91.3% when all 5 main components were included.
노각나무의 천연분포지의 집단간 변이를 알아보기 위하여 조사지의 집단별 엽형질 형태적 특성을 분석한 결과, 엽병장과 거치수를 제의한 엽장, 엽폭, 엽면적, 엽맥수에서 금산 집단이 타 집단보다 비교적 적게 나타나는 경향을 보였다. 각 형질중 엽병장과 엽면적을 제외한 형질의 변이 계수는 11.6~17.4%로 비교적 변이의 폭이 적은 반면, 엽병장과 엽면적은 집단간 변이계수가 각각 34.9%, 28.4%로 그 변이가 심하였으며, 이들 형질의 집단내 변이계수도 엽병장이 29.5~42%, 엽면적은 27.7~40.7%의 범위로 변이폭이 크게 나타났다. 또한, 12개 엽특성간 단순상관 분석결과, 엽폭과 엽면적이 상관관계가 가장 높고(r=0.975) 다음이 엽장${\times}$엽면적, 엽장${\times}$엽폭이 각각 상관계수 0.971과 0.969로 매우 높았으며, 엽저각과 엽형지수간에는 높은 부의상관(r=-0.843)을 나타내어 엽저각이 커질수록 엽형지수는 작아지는 관계를 나타냈다. 양적 질적 측정치의 유이성(similarity)에 대한 척도로서 선발집단의 엽특성을 대상으로 군집분석을 실시한 결과, 거리수준 0.4에서 제 1군은 조계산, 가야산 집단, 제2군은 백운산집단, 제 3군은 운문산, 무등산집단 그리고 제 4군은 금산집단으로 4개의 군으로 구분할 수 있었다. 거리수준 0.6에서 2군으로 구분할 수 있었으며, 제 1군은 금산집단, 제 2군은 무등산, 운문산, 백운산, 가야산, 조계산 집단으로 구분되었다. 특히, 금산 집단은 엽장, 엽족, 엽면적 그리고 엽맥수의 엽형질 특성에 있어서 나머지 5개의 집단과 분명한 차이를 보이고 있었다. 추출된 12개 주성분 중에서 고유값(eigenvalue)이 1.0이상으로 의미를 갖는 주성분은 5가지 나타났으며, 전체분산에 대한 상위 2개 주성분의 설명력은 52.7%로 엽장, 엽폭의 엽형질이 기여도가 가장 높게 나타났으며, 5개 주성분을 모두 포함할 경우의 설명력은 91.3%였다.
