Hyun Tak Shin

Distribution of Rare Plants and Endemic Plants in Jirisan National Park

The results of the study of the rare and regional species of the Jirisan (Mt.) Korea National Park has reported 3 CR species, including the Allium victorialis var. platyphyllum, 4 EN species, including Rhododendron tschonoskii, 7 VU species, including Cacalia pseudo-taimingasa, 11 LC species, including Lilium distichum, and 3 DD species, including Aconitum chiisanense, which makes a total of 28 species. In terms of species exclusive to the region, a total of 7 species, including Fraxinus chiisanensis, Pseudostellaria heterophylla, Filipendula formosa and Cirsium chanroenicum, were confirmed, and since they were distributed widely in the Jeonji region of Jirisan (Mt.), there was minimal damage. Since rare species are localized in the region of Agosan (Mt.), there has been continuous damage due to visitors and hikers to the area, and there seems to be the need to handle the decreasing habitat for Allium victorialis var. platyphyllum, Juniperus chinensis var. sargentii and Trientalis europaea.

Community Structure and Environmental Factors of the Major Type of Pinus densiflora Populations in Korea

Abstract The populations of Pinus densiflora in South Korea were grouped into 4 types; Community of Pinus densiflora-Quercus serrata, Community of Pinus densiflora-Quercus mongolica, Community of Pinus densiflora-Fraxinus sieboldiana & Rhus javanica & Quercus mongolica and Community of Pinus densiflora-Prunus sargentii & Rhododendron mucronulatum. The Shannon diversity index was varied between 0.9171 and 1.5016, while the Similarity index was varied between 43.18 and 72.16. The species of Pinus densiflora are correlated positively significant with Carex humilis var. nana, Quercus serrata and Atractylodes ovata and negatively significant with Aster scaber and Sorbus alnifolia in order. According to the Correlation analysis, the relationship between the distribution of Pinus densiflora populations and the environment factors are closely related with the character of forest soil. Thus types for Pinus densiflora are differed. pH, Ex. K and Ex. Ca of Pinus densiflora populations effect No. of species and H’(shannon index). Canopy open effects No. of Individuals of Pinus densiflora community.Key Words: community of Pinus densiflora, vegetation structure, similarity, environmental factors

Distribution of Vascular Plants in the Area of Muryongsan (mt.)

The total number of taxa examined by this study was 489 taxa of 96 families, 395 genus, 394 species, 2 subspecies, 72 mutants, 17 taxa, 1 hybrid and 3 cultivars. Only the Utricularia yakusimensis was an endangered species as designated by the Ministry of Environment in the study area, and 5 species, including the Acorus calamus, Iris ensata var. spontanea, Drosera rotundifolia, Ultricularia racemosa and Lysimachia coreana were found as endangered species as designated by the Korea Forest Service. According to the IUCN standards, a single species of Utricularia yakusimensis among CR species, Drosera rotundifolia and the Pogonia minor among VU species and the Lysimachia coreana, Ultricularia racemosa, Acorus calamus and the Iris ensata var. spontanea among LC species were detected. The specialized plants in this study included 25 species in Class-I, 3 in Class-II, 7 in Class-III and 3 in Class-IV at a total of 38 species. In terms of naturalized plants in Muryongsan (mt.), a total of 27 taxa of 11 families and 24 genus were confirmed, and the naturalization rate of the total 489 species was calculated to be 5.5%. The area studied requires a high level of monitoring and restorative methods, since the area experience high level of nondiscriminatory usage by the residents of the Ulsan region, which has led to high degree of damage.

Selection of Sancho (Zanthoxylum schinifolium S.et Z.) Cultivar for Production of Essential Oils

In this study, a comparative study was made on seed weight and fruiting season in order to improve species of Chinese pepper tree (Zanthoxylum schinifolium S. et Z.) recently used for various purposes and intended to develop a new species. In a test group of Chinese pepper trees, 200 seeds were collected by fruiting seasons and cluster sizes of seeds and their major axis and minor axis and seed weight were measured. Dispersion analysis on difference by cluster size of seeds found that the major and the minor axis and the weight of seeds by cluster had significant differences at 95% of significance level. It was suggested that there were differences in the major and the minor and the weight of a seed by cluster size. It appears that it is more advantageous to develop the species of Chinese pepper tree having smaller cluster of seeds continuously, because a seed of smaller cluster has larger weight. In addition, a dispersion study by precocious, normal, and late ripening species found that there were significant differences in the major and the minor axis and the weight of seeds at 95% of significance level. It found that there were differences in the major and the minor axis and the weight of seeds by precocious, normal, and late ripening species and the weight of a seed and the precocious species had the largest seed weight, so it seems that it is more advantageous to develop the species focused on the precocious species. In conclusion, in order to develop a species of Zanthoxylum schinifolium S. et Z for production of an essential oil, it will be useful to develop species with smaller cluster size and more seeds based on the precocious species.