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The present paper is an introduction to the whole project of "The systematic studies on Korean Betulaceae". Three studies under the project were performed this year and presented in this report : a review of taxonomic literatures and the construction of distribution maps by Woo-Tchul Lee, pollen morphology by Sang-Tae Lee and Moo-Yeol Kim, and wood anatomy by Woong-Young Soh and Kwan-Bae Jeon.
A phytosociological study on the Mongolian oak forest was carried out on Mt, Sorak by the Z-M method. The Mongolian oak forest was classified into one oder, two alliances, one association and three communities : Rhododendro-Quercetalia mongolicae Kim 1990 Lindero-Quercion mongolicae Kim 1990 Vaccinium hirtum v. koreanum-Quercus mongolica Community Lespedeza maximowiczii-Quercus mongolica Community Pino koraiensis-Quercion mongolicae Kim 1992 Typical community Lichno-Quercetum mongolicae Kim 1992 Total vascular plant species in investigatied sites consisted of 193 taxa, and their life-farm composition Was H-D_(1)-R_(5)-e type.
Distribtion and re-examination of Betulaceae species were reported as a part of systematic study on Korean-Betulaceae. The previous study on the composition of Betulaceae in 1981 was revised to be 5 genera, 23 species, 13 varietie and 9 formae. The identification key was also re-constructed.
As for 22 species and 6 varieties of 5 genera of the Korean Betulaceae, an identification key was constructed on the basis of flower, seed and leaf characters and distribution maps were provided. The most widely distributed species throughout Korea included Alnus japonica, Betula chinensis, B. davurica, Corylus heterophylla and C. sieboldiana. Species distributed along the mountain ranges in general were Betula costata, B. ermanii var. saitoana, B. schmidtii, and B. platyphyhlla var. japonica ; however, those somewhat restricted along the nothern high alpine area were Almus friticosa var. mandshurica, A. maximowiczii, A. vermicularis, Betula platyphylla, B. fruticosa, B. paishanensis, and B. microphylla var. coreana. Carpinus tschonoskii, and C. latiflora south to the middle province ; C. turczaninovii along the coast south to the middle province ; Corylus hallaisanensis and Ostrya japonica along the southern coast of Korean penninsula.
The flora of vascular plants and the forest structure in Mt. Chombong were studied from 1987 to 1990. 106 families, 413 genera, 801 species, 36 varieties, 17 formaties of vascular plants were classified. Of these, 35 taxa including Megaleranthis saniculifolia and Hanabusaya asiatica are endemics. Phytosociological studies indicated that the vegetation were divided into Quercus mongolica association two subassociation, Abies holophylla and Acer mono. Along the altitude gradient, the importance value of Q. mongolica was the highest at all the stand except for Betula davurica and Acer mono at 800m. Frequency distribution of DBH showed convex form in Q. mongolica but L form in Acer pseudo-sisboldianum. This means there are no natural regeneration fo Q. mongolica, recently.
Vascular plants of Hwangcheolbong were composed of 84 families, 250 genera, 325 species, 2 subspecies, 54 varieties and 12 forma, totaling 393 taxa. Among the 393 taxa. Thirteen species such as Deutzia uniflora, Filipendula palmata var. glabra, Lespedeza intermedza var. retusa, Lespedeza thunbergii for. angustifolia, Vicia venosissima, Viola diamantiaca, Vaccinium koreanum, Patrinia saniculaefolia, Hanabusaya asiatica, Aster ciliosus, Cirsium setidens, Saussurea diamantiaca, and Carex okamotoi were Korean endemic. The specific plants based on the distribution pattern appointen by Ministry of Environment were 69 taxa, and estimated 328 points. The naturalized plants were 7families, 11 genera, 12 species, 1 variety, totaling 13 taxa.
This study was carried out to characterize pinus densiflora forests in middle province (Mt. Seolag, Mt. Taebaik) south province (Mt. Sokli, Mt. Jiri) and south-coast province (Mt. Daedun) of Korea. The appearance species in the P. densiflora alliance included 325 taxa and varied according to the direction of slopes. The steeper the slope was, the fewer number of taxa were observed. The floristic composition of south-coast province was gradually changing to the south hemispheric factors. Dominant species groups of P. densiflora alliance were classified into P. densiflora, Quercus serrata ( layer), Rhus trichocarpa ( layer), Lespedeza maximowiczii var. tomentella (S layer), Artemisia keiskeana, Carex humilis var. nana, Spodiopogon sibiricus (K layer). Quercus variabilis, Fraxinus sieboldiana and Styrax japonica association were formed under the P. densiflora alliance. Quercus, Rhus, Lespedeza and Rhododendron groups maintained high ecological relationships one another. The soil factors (pH, organic matters, and water field capacity)and relative light intensity tended to show negative correlation, which were significantly different among provinces. The P. densiflora forests of Korea were classified into one alliance and four associations, that is, pinion densiflorae Suz.-Tok. 1966, Quercetum variabilae ass. nov., Quercetum mongolicae ass. nov. Fraxinetum sieboldianae ass. nov. and Styraxetum japonicae ass. nov.
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This study was carried out to determine degree of geeen naturality, in Cheolweon- gun, Hwacheon-gun, and Chunseong- gun, to surveyed the floristic composition of Mt. Myeongseong in Cheolweon- gun, Mt Seokryong in Hwacheon-gun, and Mt. Obong in Chunseon- gun, concentrated on this studied areas. The squre of studied areas were 2, 820㎢ and this area composed of 2, 665 meshes Nine different grades of green naturality; (1),(2),(3),(4),(5),(6),(7),(8),(9),(0) have been registered 1,673 meshes (62. 78%) out of 2, 665 were classified as the grade 8 and 389 meshes (14.6%) were the grade 7. The above data indicate that this areas composed of 20-50 years forests. Plant biomass, net production and oxygen production were estimated to be 15, 657, 330ton/year, 1,609, 590 ton/year, 1,706, 165.4ton/year in this area. Floristic composition of Mt. myeongseong (922.6m) was revealed to be 372 taxa, and that of Mt. Seokryong(1300m) wes 471 taxa, and that of Mt. Obong was 562 taxa. Among them 24 species were indigenous to Korea, including genera of Hanabusaya. It is interesting that north hemispheric plant. Astilboides tabularis was distributed at Mt. Seokryong.