• Journal of Environmental Science International
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• v.22 no.8
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• pp.979-997
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• 2013

This study aims at classifying and interpreting on the vegetation structure, the correlation between a vegetation and an environment, a species diversity and a life-form of Evergreen Broad-Leaved Forest(EBLF) located in Gageo-do Island. It is also the objective that the estimation of vegetation change founded on the species composition and characteristics. The vegetation of EBLF was classified into three forests or four community units as Machilus thunbergii forest (Polystichum polyblepharon-M. thunbergii community and Phaenosperma globosum-M. thunbergii community), Ilex integra-Castanopsis sieboldii community, Quercus acuta community and Neolitsea sericea stand. The ordination analysis by DCA is analogous with the vegetation structure analysis. As a result of the correlation (Pearson's correlation coefficient) with environmental conditions, the Altitude has the significance with the distribution of communities. The total vegetation change by progress of succession will not be wandered away from the present vegetation structure practically, and the vegetation on the underlayers will be a little changed.

• The Korean Journal of Ecology
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• v.5 no.4
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• pp.164-175
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• 1982

This paper contains the results obtained by the ecological investigation in Bijin island. The investigation was conducted during 3 dyas from Aug. 3 to Aug. 5, 1981. The results are followings. The tracheophyta of this island was recoreded as 64 families, 128 genera, 142 species, 21 varieties and 2 forma. Twenty eight species of ever-green broad-leaved trees comprising Gardenia jasminoides for. grandiflora, Castanopsis cuspidata var. thunbergii, Camellia japonica, etc. wad distributed in the southern area of the island. And there was the wind-break forest mainly consisting of aged Machilus thunbergii, Celtis sinensis and Zelkova serrata in the northern area. The northern area dominated by the second forest of Pinus thunbergii, where the whole residents lead their lives, shows the high population density and pure farming rate, so the natural degree is low. The other hand, there was the well-preserved forest of broad-leaved trees containing Zelkoba serrata. Acer palmatum and Quercus serrata, etc. in southern area having a steep peak, Seonyudai, and no resident. So, the potential vegetation of this island is assumed as the forest of ever-green broad-leaved trees which belongs to the forest of subtropics.

• Korean Journal of Plant Resources
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• v.20 no.1
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• pp.28-37
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• 2007

The flora of vascular plants of these sites were listed 272 taxa; 80 families, 193 genera, 234 species, 32 varieties, 5 forms and 1 hybrid. The naturalized plants were 12 taxa, and naturalization rate was 4.4%. Specific plants by floral region were total 54 taxa; 4 taxa in class IV, 10 taxa in class III, 5 taxa in class II, 35 taxa in class I. There is no taxa in class V. A peculiar point is that we found more than 30 Allium pseudojaponicum in Allium genus which is known as Japanese endemic plant. In Gokdudo, there is large Carex boottiana community, in Daehangdo, Machilus thunbergii community covers the whole island. In Bulgeundo, most of the hundreds of trees including Neolitsea sericea and Machilus thunbergii planted by Korea National Parks in 2003 have been damaged by rabbits.

• Journal of the Society of Cosmetic Scientists of Korea
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• v.43 no.3
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• pp.195-200
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• 2017

This study was conducted to examine the inhibitory effects of meso-dihydroguaretic acid (MDGA, 1) and its synthetic derivatives (compound 2 and 3) against NO production. MDGA is a lignan component isolated from the bark of Machilus thunbergii Sieb. et Zucc. We synthesized dimethylated MDGA (2), diacetylated MDGA (3) and compared NO inhibition of two derivatives with that of MDGA (1). MDGA (1) and compound 3 showed suppressive effects against the generation of NO in LPS-activated macrophages. RT-PCR analysis suggested that MDGA (1) and compound 3 inhibited NO production through the suppression of iNOS mRNA expression. From these results, diacetylated MDGA (3) can be used as a pro-drug for MDGA.

• Korean Journal of Environment and Ecology
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• v.27 no.5
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• pp.592-613
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• 2013

This study was carried out to analyze the vegetation properties, soil characteristic, and ordination of forest in Hongdo island and the results are as follows: Castanopsis cuspidata var. sieboldii community, Quercus acuta community, Machilus thunbergii community, Pinus densiflora community and Carpinus coreana community. The results of importance value on the vegetation of Hongdo island consisted of the following in order: 75.56% of Castanopsis cuspidata var. sieboldii, the highest, 34.84% of Pinus densiflora, 29.11% of Machilus thunbergii, 26.88% of Camellia japonica, 17.79% of Quercus acuta, 15.23% of Dendropanax morbifera, 13.41% of Ligustrum japonicum, 12.67% of Carpinus coreana. Due to the high organic matter, total nitrogen and low pH, the soil properties of Hongdo island are different from those of other forest in Korea. The composition of soil properties in the same areas are as follows: organic matter, total nitrogen, available phosphorous, exchangeable $K^+$, exchangeable $Ca^{2+}$, exchangeable $Mg^{2+}$ contained, and soil pH. The capacities of these chemical properties of the soil ranged from 14.48~25.45%, 0.49~0.90%, 26.00~58.68 mg/kg, $0.64{\sim}1.64cmol^+/kg$, $6.22{\sim}21.5cmol^+/kg$, $2.92{\sim}6.95cmol^+/kg$, and 4.42~5.44 respectively. The results of the correlation between communities and soil conditions of vegetation of Hongdo island by DCCA ordination method are as follows: Castanopsis cuspidata var. sieboldii community was found in the highest soil moisture and followed in order Machilus thunbergii community, Quercus acuta community. The Machilus thunbergii community was found in the highest pH, exchangeable $Ca^{2+}$, exchangeable $Mg^{2+}$, exchangeable $K^+$ and cation exchange capacity. The Carpinus coreana community was found in the highest elevation, total nitrogen, cation exchange capacity, exchangeable $Mg^{2+}$ and followed in order Pinus densiflora community.

• The Korean Journal of Ecology
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• v.23 no.3
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• pp.217-221
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• 2000

The vegetation of Maemul, Somaemul and Eoyu islets in Tongyeong-si was investigated from September, 1996 through August, 1997. In order to analyze the vegetation of this islets, synthesis table, actual vegetation map were prepared. The predominant species of the islets was Camellia japonica. and the vegetation in this study area was classfied into 4 communties (included 1 afforestation) and 7 subcommunities 1 . Camellia japonica community 1) Typical subcommunity 2) Machilus thunbergii subcommunity 3) Castanopsis cuspidata var, thunbergii subcommunity 4) Ligustrum obtusifolium subcommunity 5) Carpinus coreana subcommunity 6) Selaginella tamariscina subcommunity 7) Pinus thunbergii subcommunity 2. Pinus thunbergii community 3. Alnus firma afforestation 4. Miscanthus sinensis var. purpurascens community.

• Journal of agriculture & life science
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• v.45 no.6
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• pp.89-94
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• 2011

In this study, the amount of seedlings and seed dispersal of evergreen broad-leaved trees in forest community adjacent to Camellia japonica forest were studied to provide basic information for effective management of evergreen broad-leaved forest. Evergreen broad-leaved trees including C. japonica, Neolitsea sericea, Machilus thunbergii, Ligustrum japonicum, Cinnamomum japonicum, Litsea japonica, Pittosporum tobira showed high density and ratio of seedlings in community adjacent to C. japonica forest. Although individual densities of N. sericea, M. thunbergii, L. japonicum were low, their seedlings were distributed up to Pinus thunbergii and coniferous broad-leaved forest at a distance of 100m and 200m from C. japonica forest. Distribution of DBH class of C. japonica suggested a continuous spread from higher frequency of young individuals, N. sericea, M. thunbergii and L. japonicum did not showed an obvious trend. Seed of C. japonica mainly dispersed within 50m from mother tree.

• YAKHAK HOEJI
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• v.41 no.2
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• pp.153-160
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• 1997

One hundred and seventy crude drugs were screened for prolyl endopeptidase (PEP) inhibitors. Among them, 80% methanolic extract of 18 medicinal plants such as Polygonum cuspi data, Sanguisorba officinalis, Eugenia caryophyllata, Rubus coreanus, Cinnamomum cassia (Cassiae Cortex and Cinammomi Ramulus), Rheum palmatum, Ulmus pumila, Sorbus commixta, Areca catechu, Uncaria sinensis, Terminalia chebula, Caesalpinia sappan, Nelumbo nucifera, Machilus thunbergii, Paeonia moutan, Elscholtzia patrini and Cynomorium coccineum inhibited more than 70% of PEP activity at a concentration of 40 ppm. The active principles of P. moutan, M. thunbergii, T chebula, A. catechu, S. commixta, R. palmatum, R. coreanus, E. caryophyllata and P. cuspidata were transferred into organic solvents, which showed more than 75% inhibition at 5 ppm.

• The Korean Journal of Ecology
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• v.5 no.4
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• pp.187-203
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• 1982

The results obtained from te field investigations of Chuja Island conducted for 5 days from July 18 to 22, 1980 and from August 12 to 16, 1981 are summarized as follows: Vascular plants of this island disclosed by the present study consisted of 86 families, 210 genera, 228 species, 38 varieties and 4 래금. Nineteen species of evergreen broad-leaved trees were discovered, including Litsea japonica Juss, Camellia japonica L. and Machilus thunbergii Sieb. et Zucc. These indeciduous latifoliate trees were preserved in poor condition. Ten-twenty years old Pinus thunbergii was confirmed to be the predominant species. Seaside plants encountered were 6 species, including Vitex rotundifolia L. Fil. and Asterspathullfoius Max., but they were poorly distributed. Naturalized plants comprised a total of 12 species. This varied number of species is considered attributable to the frequent access of men owing to convenient marine traffic. the destruction of vegetation of this island may be attributed to human interference (loggin for boat construction, building and charcoal materials) ever escalated by high population density. It is worthy of noting that Bochmeria penosa Nakai et Stake which forms a large community in this island can be used as textile resources.

• Korean Journal of Environment and Ecology
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• v.30 no.2
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• pp.228-242
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• 2016

This research was conducted for understanding the evergreen forest community structure of the Bijin Island. The island was worth of vegetational value because of the representative warm temperate species such as Castanopsis cuspidata was distribute there. According to the results of community classification by TWINSPAN and DCA, the Bijin Island evergreen forest were classified by 9 communities, such as C. cuspidata, C. cuspidata-Pinus thunbergii, Neolitsea sericea-Camellia japonica, Platycarya strobilacea, Quercus serrata-Decidus broad-leaved, Alnus firma, P. thunbergii. Due to the C. cuspidata, N. sericea, Ca. japonica etc. were still dominated at canopy and under-canopy layer, so the evergreen forest will be sustain current conditions for a while if there is no artificial disturbances that were caused by human. Pl. strobilacea community will be expected to replace N. sericea and also Q. serrata-Decidus broad-leaved community will be changing caused by mutual competition. Normally, in the way of the succession process of the warm temperate forest, P. thunbergii will be expect via deciduous broad-leaved to evergreen forest such as Machilus thunbergii, C. cuspidata var. sieboldii, and N. sericea. In case of species diversity index, P. thunbergii comm.(1.2739), Q. serrata-Decidus broad-leaved comm.(1.2325), Decidus broad-leaved comm.(1.1807), and A. firma comm.(1.0854) are relatively high, while C. cuspidata and N. sericea-Ca. japonica that was dominated by evergreen species at canopy layer and P. thunbergii that was damaged by fire are relatively low(0.7380~0.8416). Soil pH was 4.72~6.33, electric conductance was 0.035~0.128dS/m, and content of organic matter was 3.4~17.4%.