본 연구는 2007년도 조사된 국가산림자원조사 자료를 이용하여 충북지방에 분포하는 주요 수종에 대하여 평균 연륜생장량과 연륜생장량에 영향을 미치는 인자들과의 상관관계를 분석하고자 하였다. 충북지역에서 조사된 고정표본점은 총 56개소로 다양한 수종이 분포하였으며 그 중 개체수 분포 비율이 높은 10개 수종에 대하여 총 800본의 연륜생장량이 조사된 목편 자료를 대상으로 분석하였다. 충북지방에서 평균 연륜생장량이 가장 높은 수종은 아까시나무(2.30mm/yr)로 나타났고, 그 다음으로는 졸참나무(2.27mm/yr)>산벚나무(1.98mm/yr)>일본 잎갈나무(1.98mm/yr) 순으로 나타났다. 대부분 주요 수종들의 경우, 영급과 임분밀도가 증가함에 따라 평균 연륜생장량은 감소하는 경향으로 나타났다.

In order to investigate the basic vegetation information for the efficient management of the Sorbus commixta habitat in Korea, 31 plots in Mt. Chiri area were selected of which vegetation types were classified in phytosociological method and ecological characteristics were identified. As a result, the habitat was classified as S. commixta community group which was then subdivided to Prunus padus group and Picea jezoensis group. Prunus padus group was classified in Ainsliaea acerifolia subgroup and Magnolia sieboldii subgroup, while the Picea jezoensis group was classified in Rhododendron mucronulatum subgroup and Echinopanax horridum subgroup. Thus, the forest vegetation of S. commixta was classified in 1 community, 2 groups and 4 subgroups, and found to have 4 vegetation units in total.

The purpose of this study was to establish basic database on Sorbus alnifolia by investigating, analyzing and comparing characteristics of leaf, and then foster good cultivar on each morphological characteristics - leaf length, leaf width, petiole length, left lateral vein, right lateral vein. Leaf length and leaf width in Osan showed distinct tendency in comparison with the whole mean : 103.4mm and 63.3mm, 86.4mm and 62.9mm, respectively. Populations of Mt. Dukyoo and Mt. Halla showed leaf length of 52.8mm and 58.2mm respectively 32.6% and 39% lower than the mean of ten population. Leaf width of Mt. Gwangyang and Mt. Chink was 52.8mm and 51.9mm, respectively 17.6% and 16.2% lower than whole mean, respectively, and showed the lowest tendency among ten selected populations.

The objectives of this study were to examine the genetic variation of 20-year-old tree height and to estimate heritabilities and genetic gains of Korean white pine. Analysis of variance showed that families and family x block interaction had the significant (p=0.01) effects on tree height. However, family variation appears to be much greater than the variation due to family x block interaction. Individual tree heritability was higher (hI2=0.73) than family heritability, (hF2=0.83) therefore, combined selection showed the largest genetic gain (17.76%) in a given equal intensity of selection.

This study was performed to provide basic information of the development and breeding of new cultivars of Hibiscus syriacus L., which have more beautiful and diverse flowers. Morphological characteristics of the flowers and leaves, and genetic variation of the flowers color of two Jeoktanshim-line cultivars, Bulsae and Pyungsung, were crossed each other. The result of the cross between Bulsae and Pyungsung are as follows: Mean flower height and width were 5.35 cm and 7.69 cm, respectively. Mean length and width of petal were 5.43 cm and 3.80 cm respectively, and mean length and width of flower pistil were 4.67 cm and 0.44 cm, respectively. The flower color of all ten individuals was the color of the Jeoktanshim-line, and Pyungsung, and all flower type were I-c type.

The purpose of this research is to establish basic database on Cornus kousa by way of investigation, analysis and comparison of characteristics of leaf and flower, then fostering good cultivar on each morphological characteristics - leaf length, leaf width, petiole length, left lateral vein, right lateral vein. Leaf length and leaf width in Mt. Jiri shows big tendency which is 83.5 mm, 52.4 mm each in comparison with the whole mean of 72.5 mm, 41.2 mm, whereas populations of Suwon and Mt. Halla has leaf length of 66.0 mm, 65.7 mm - 9.8%, 10.4% lower value in comparison with seven mean population; leaf width is 38.4 mm, 35.3 mm - 7.3%, 16.7% lower than whole mean and shows lowest tendency among seven selected populations. Long width of flower and short width of flower in Boeun shows big tendency which is 99.9mm, 96.5 mm each in comparison with the whole mean of 76.0 mm, 73.6 mm, whereas populations of Mt. Halla has 50.1 mm, 48.2 mm which shows lowest tendency. On petal length, petal width and length of flower petiole, Boeun populations have bigger and Mt. Halla shows little tendency. The measurement result of flower colors on each population by using Spectrum Color Mater shows followings: populations of Mt. Duckyoo and Mt. Halla shows lower lightness than any other populations, but wholly shows higher lightness which is refers brightness in seven selected populations. Thus it shows peculiarities of white flower color.