• Natural Product Sciences
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• v.14 no.4
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• pp.244-248
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• 2008

It is well known that excessive production of reactive oxygen species (ROS) leads to oxidative stress, loss of cell function, and ultimately apoptosis or necrosis. To search for natural antioxidants able to modulate cellular oxidative stress, we investigated the protective effect of ethanol extracts of 17 medicinal plants selected from the preliminary antioxidant screening on tert-butyl hydroperoxide (t-BuOOH)-induced oxidative stress in human keratinocytes. The result showed that extracts of the four plants, Distylium racemosum, Astilbe chinensis, Cercis chinensis and Sapium japonicum, exhibited significant cytoprotective activity (over 50% protection) against t-BuOOH-induced cellular injury.

• Korean Journal of Pharmacognosy
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• v.40 no.4
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• pp.382-387
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• 2009

Enhanced formation and accumulation of advanced glycation end products (AGEs) have been implicated as a major pathogenesis process leading to diabetic complications, normal aging, atherosclerosis and Alzheimer's disease. In our ongoing project to discover novel treatments for diabetic complications from natural sources, we have investigated on the inhibitory activity of 67 ethanol extracts from 57 Korean herbal medicines against the formation of AGEs in vitro. Of these, 22 extracts were found to have a significant AGEs inhibitory activity ($IC_{50}$<50 ${\mu}g$/ml) compared with aminoguanidine ($IC_{50}$=75.98 ${\mu}g$/ml). Particularly, 6 extracts from 3 herbal medicines, Castanea crenata (flower, leaf, bark-twig), Acer tatarium subsp. ginnala (fruit) and Sapium japonicum (leaf, twig) showed (approximately 8-17 fold) stronger inhibitory activity than that of aminoguanidine.

• Journal of Korean Society of Forest Science
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• v.97 no.3
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• pp.296-304
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• 2008

This study was carried out to analyze vegetation and soil characteristic, and ordination of Stewartia koreana community. The Stewartia koreana community was classified into Acer mono subcommunity, Pinus densiflora subcommunity, Sapium japonicum subcommunity, and Stewartia koreana typical subcommunity. In the study sites, soil organic matter, nitrogen, available phosphorous, exchangeable K, exchangeable Ca, exchangeable Mg concentration, cation exchange capacity, and soil pH were ranged from 14.31~34.27%, 0.33~0.77%, 7.83~22.88(mg/kg), 0.23~1.07(me/100 g), 0.29~2.93(me/100 g), 0.33~1.49(me/100 g), 10.47~22.48(me/100 g), and 4.65~4.96, respectively. The area of the Acer mono subcommunity, found in highlands, showed that contained the highest organic substances, nitrogen, available phosphorous, and cation exchangeable capacity concentration among the communities. The low elevation regions where the Pinus densiflor subcommunity is formed, showed the lowest concentrations of exchangeable Ca, and Mg.

• Korean Journal of Agricultural and Forest Meteorology
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• v.6 no.4
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• pp.265-271
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• 2004

This study was carried out to furnish basic information on the habitat through soil condition and vegetation structure of an Acer mono for. rubripes stand in Geoje, Gyeongnam Province. Soil pH of the A. mono for. rubripes stand was 5.17. The contents of organic matter, total N and available P205 were 8.7%,0.38%, 15.7ppm, respectively. A. mono for. rubripes, Meliosma oldhamii, Zelkova serrata, Styrax japonica, Sapium japonicum, Lindera erythrocarpa and Euonymus oxyphyllus appeared in all layers. The importance values of A. mono for. rubripes, Z. serrata and Quercus serrata in the upper layer were high, S. japonicum and M. myriantha were high in the middle layer and lower layer, respectively. Species diversity and evenness ranged from 0.931 of the middle layer to 1.638 of the lower layer, and from 0.706 of the upper layer to 0.959 of the lower layer, respectively. The study results provide basic information on soil condition and vegetation structure of the Acer mono for. rubripes stand native to Geoje, Korea.

• Korean Journal of Agricultural Science
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• v.6 no.2
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• pp.134-147
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• 1979

Mt. Kyeryong(828 meters in height) is located at $36^{\circ}18^{\prime}{\sim}36^{\circ}23^{\prime}$ N.L. and $127^{\circ}10^{\prime}{\sim}127^{\circ}17^{\prime}$ E.L., and also occupies three districts: Gongju-Gun, Nonsan-Gun, Daedeok-Gun. Authors surveyed the flora of the areas ten times from May to October, 1979. Variability of floras is rather high and dominant species are such as Pinus densiflora, Quercus mongolica, Quercus serrata, Quercus variabilis, Lindera erythrocarpa, Carpinus cordata, Acer pseudo-sieboldianum var. koreanum, Strax japonica, Sapium japonicum, Euonymus oxyphyllus, Sorbus alnifolia, Stephanandra incisa, Weigela subsessilis, Rhododendron mutcronulatum, Lespedeza bicolor, Sasa borealis, Celastrus orbiculatus, Arundinella hirta, Miscanthus sinensis var. purpurascans, and so on. There are 105 families, 355 genera, 679 species. According to the use of floras, they can be classified as follows; 69 familia and 287 species for edible source, 83 familia and 227 species of medicinal, 60 familia and 253 species for forage, 44 familia and 132 species for ornamental and 12 familia and 39 species for timber source.

• Journal of Korean Society of Forest Science
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• v.77 no.2
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• pp.166-177
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• 1988

To investigate the structure of the plant community of the Naejang Temple District in Mt. Naejang National Park, 22 plots were set up by the vegetation physiognomy and vegetation analysis by four kinds of ordination techniques(PO, PCA, RA and DCA) was carried out. Pure and mixed forest community of Quercus variabilis and Q. mongolica were major forest communities and each of them covered 31.27 and 20.77%, respectively. The degree of human disturbance of vegetation 9, 8, 7 and 6 area covered 30.9, 67.0, 0 and 0.02%, respectively. According to stand dynamic analysis by DBH class distribution, the present Pinus densiflora and Quercus communities may be succeeded to Carpinus laxiflora communities. DCA was the most effective method of this study. DCA ordination showed that successional trends of tree species seem to be from P. densiflora through Q. variabilis, Q. aliena, Sorbus alnifolia, Platycarya strobilacea to Carpinus laxiflora, Fraxinus rhynchophylla, Zelkova serrata, Cornus controversa in the tree layer, and from Rhododendron mucronulatum, Rh. schlippenbachii, Lespedeza cyrtobotrya, Rhus trichocarpa through Styrax japonica, Daphniphyllum macropodum, Sapium japonicum to Euonymus oxyphyllum, E. sieboldiana, Lindera erythrocarpa in the subtree layer.

• Journal of Korean Society of Forest Science
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• v.90 no.3
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• pp.249-256
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• 2001

The objective of this study was to analyze characters of the vegetation structure, vegetation-environment relationships of Kyeryongsan forest community. Fifty plots were sampled in the valley forest of Donghaksa, Gabsa, Sanghasinri and Shinwonsa regions in Kyeryongsan. Field survey was carried out in August of 1999 to examine a vegetation type and measure a diameter. The classification by TWINSPAN, the DCCA ordination, and structure of stand were used to analyze data. The results of this study are as follows : 1. With the classification by TWINSPAN, the community was categorized into four groups, such as Carpinus laxiflora, Quercus variabilis-Quercus serrata, Zelkova serrata-Celtis jessoensis and Carpinus cordata communities. 2. The dominant species in Carpinus laxiflora community were Carpinus laxiflora, Quercus variabilis, Quercus serrata, Pinus densiflora and Styrax japonica. The dominant species in Quercus variabilis-Quercus serrata community were Quercus variabilis, Quercus serrata, Styrax japonica, Castanea crenata and Platycarya strobilacea. The dominant species in Zelkova serrata-Celtic jessoensis community were Quercus serrata, Castanea crenata, Lindera erythrocarpa, Zelkova serrata and Styrax japonica. The dominant species in Carpinus cordata community were Carpinus cordata, Carpinus laxiflora, Sapium japonicum, Cornus controversa and Zelkova serrata. 3. The results of the correlation between Kyeryongsan valley forest community and environmental factors by DCCA ordination method are as follows; The Carpinus laxiflora community was found in low elevation and steep slope area. The Quercus variabilis-Quercus serrata community was found in low elevation and lower slope area. The Zelkova serrata-Celtis jessoensis community was found in high elevation and lower slope area. The Carpinus cordata community was found in high elevation and midium slope area.

• Korean Journal of Ecology and Environment
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• v.50 no.1
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• pp.126-136
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• 2017

We describe characteristics of diversity and distribution of oak forests on the Daegok-cheon gorge of the Southeastern Korean Peninsula, the oldest prehistoric site, in view of a sort of food resources of acorns. The $Z{\ddot{u}}rich$-Montpellier School's method was adopted for field investigation on the oak dominant stands. A total of 20 phytosociological $relev\acute{e}s$ composed of 193 taxa were analyzed by syntaxonomy and ecological flora. The Daegok-cheon's oak forests occupied 36.9% ($513,374m^2$) of the surveyed area, and its 99% ($507,677m^2$) was Quercus variabilis and Q. serrata stands. Oak forests of the Daegok-cheon gorge are a kind of regional vegetation type characterizing by the high relative net contribution degree (r-NCD) of Platycarya strobilacea and Sapium japonicum, which are an edaphic type of the xerophilous and thermophilic oak forests. The region of the Daegok-cheon petroglyphs is defined as an ecoregion with rich acorn supply and abundant water resources, and the warmer environment, which attracts prehistoric man.

• Korean Journal of Environment and Ecology
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• v.20 no.2
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• pp.114-121
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• 2006

To investigate the vegetation structure of mountain ridge from Miwangjae to Cheonwhangbong, 11 plots($2000m^2$) set up with random sampling method were surveyed. Three groups of Quercus mongolica community, Quercus mongolica-Styrax japonica community, Q. mongolica-Pinus densiflora community were classified by cluster analysis. Quercus mongolica was a major woody plant species in the ridge area from Miwangjae to Cheonwhangbong, and Styrax japonica and Pinus densiflora was partly occupied. High positive correlations was proved between Prunus sargentii and Euonymus alatus for. ciliato-dentatus; Quercus serrata and Euonymus alatus; Sorbus alnifolia and Euonymus alatus, Magnolia sieboldii; Acer pseudo-sieboldianum and Euonymus alatus for. ciliato-dentatus; Rhododendron schlippenbachii and Euonymus alatus for. ciliato-dentatandus; Euonymus alatus and Lindera obtusiloba, Castanea crenata, Lindera erythrocarpa; Lespedeza bicolor and Rhododendron schlippenbachii; Castanea crenata and Magnolia sieboldii; Magnolia sieboldii and Lindera erythrocarpa, and relatively high negative correlations was proved between Rhododendron schlippenbachii and Euonymus alatus; Lespedeza bicolor and Castanea crenata; Stephanandra incisa and Magnolia sieboldii; Rhododendron yedoense var. poukhanense and Lindera erythrocarpa; Euonymus alatus for. ciliato-dentatus and Magnolia sieboldii; Fraxinus sieboldiana and Sapium japonicum; Prunus sargentii and Lespedeza maximowiczii; Lespedeza maximowiczii and Lindera erythrocarpa. Species diversity(H') of investigated groups was ranged $2.3225{\sim}2.7721$, and it was relatively low value compared to that of mountain ridge area of other national parks.

• Journal of the Korean Society of Environmental Restoration Technology
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• v.19 no.3
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• pp.45-57
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• 2016

This study was focused on the northernmost limit of the distribution changing of Daphniphyllum macropodum and studied characteristic of plant communities of natural monument No. 91 in Najangsan national park, Korea. The results of this study were as follows : 1. The highest importance percentage(I.P.) value at tree layer in Quercus. mongolica community was Q. mongolica, 37.8%. But the highest value of mean importance percentage(M.I.P.) was D. macropodum, 32.8%. 2. The highest I.P. value at tree layer in Carpinus laxiflora community was C. laxiflora, 47.4%. The highest M.I.P. value was C. laxiflora, 28.8% and M.I.P. value of D. macropodum was 24.0%. 3. The highest I.P. value at tree layer in D. macropodum community was D. macropodum, 55.6%. C. laxiflora and Q. mogolica I.P. value was 14.8% and 6.8%, respectively. The highest M.I.P. value was D. macropodum, 47.9%. Sapium japonicum and C. laxiflora M.I.P. value was 11.4% and 10.7%, respectively. 4. The highest I.P. value at tree layer in Quercus variabilis community was C. laxiflora, 20.8%. Q. variabilis and Acer pseudosieboldianum I.P. value was 15.3% and 12.5%, respectively. The highest M.I.P. value was D. macropodum, 21.5%. It needs to the continuous monitoring of vegetation and importance percentage change in tree layer and subtree layer of D. macropodum. The researching results of D. macropodum distribution, the distribution range of D. macropodum showed expanded more than range of Lim and Oh' result(1999). In other words, it was distributed low density level between Najangsa temple and Byeokryeonam, and distributed in upper Keumsun waterfall and Wonjeok upper valley. D. macropodum was appeared on hiking trails around from Wonjeokam to Bulchulbong. Especially, it was found in this study that D. macropodum was distributed on Seoraebong's north which placed outside area of Naejangsa region. In this study, it was considered that distribution range of D. macropodum was expanded. Also, it is expected to be used as a result of the field study of changing distribution study of broad leaved evergreen forest due to global warming.