• Title, Summary, Keyword: Cheju Island

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VULCANOKARST ON CHEJU ISLAND IN SOUTH KOREA

  • Hong, Shyhwan
    • Journal of the speleological society of Korea
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    • v.41 no.1
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    • pp.3-15
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    • 1994
  • Geographically Cheju Island is located in the southmost part of Korea. Cheju Province, the largest. island in Korea, consists of one major island, Cheju, and other minor islands including Chuja Island. The province is located in around 140 km from Mokpo on the north, about 272 km from Pusan. Tsushima Island of Japan on the northeast, and Shanhai of the China across the East China Sea to the west.(omitted)

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Studies on the Floristic Composition and Succession of the Shrub Communities at the Summit of Mt. Halla, Cheju Island, Korea

  • Kim, Moon-Hong;Masato, Yoshikawa;Tukasa, Hukusima
    • The Korean Journal of Ecology
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    • v.22 no.6
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    • pp.325-335
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    • 1999
  • Empetrum nigrum dominant community or Rhododendron mucronulatum and R. yedoense var. poukhanense dominant shrub community are developing above l,500m on Mt. Halla in Cheju Island, Korea. These communities were formed as a result of the forest of Abies koreana regression by grazing or erosion over a long period of time. This study was conducted using the phytosociological method and it clarified the floristic composition of the community in Cheju Island by comparing with a similar community in Japan. Also this study interpreted the development data of these communities and considered community succession. As a result of our interpretation, shrub community of Cheju Island is recognized as two associations, Festuco obinae-Empetretum nigrum ass. nov and Rhododendretum mucronulatum ass. nov. Each association of Cheju Island is composed of endemic species of Cheju Island. related to the Korean peninsula and to Japan. The two associations are divided into 8 sub-units but each community development has been created with longtime grazing and prescribed fire. Maybe the location stability by stoppage of interference and grazing will process community transition Quickly. Comparing the shrub communities of Cheju Island with Maianthemo-Rhododendretum in Kyushu, Japan, which is close geographically, both areas have the species of Miscanthetea sinesis and Ericaceae in common. But Cheju Island has more abundant species and has higher ratio of appearance of alpine plants. The shrub communities of Cheju Island and Kyushu. Japan are identified as having a different rank over Alliance.

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Oceanographic Conditions in the Neighboring Seas of Cheju Island and the Appearance of Low Salinity Surface Water in May 2000 (2000년 5월 제주도 주변해역의 해황 및 표층 저염분수의 출현)

  • KIM Sang Hyun;RHO Hong Kil
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.37 no.2
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    • pp.148-158
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    • 2004
  • In the adjacent seas of Cheju Island, the oceanographic conditions show low salinity surface waters starting in May. This water flows from the southeast part of the China Coastal Water, which flows southeastward along the Great Yangtze Sand Bank until April, with the help of southeasterly winds and flows from the adjacent sea off Cheju Island. In May, the Tsushima Warm Current and the low salinity surface water fluctuate in short and long-term periods as influenced by Yellow Sea Cold Water, which flows to the bottom layer at the western entrance of Cheju Strait. Temperature and salinity fronts in the northeastern sea area of U Island are formed in the boundary area between the Tsushima Warm Current, which expands towards Cheju Island from the southeastern sea area of Cheju Island and Hows out from the eastern entrance of the strait. Seasonally, additional oceanographic conditions, such as coastal counter-currents, which flow southward, appears within limited areas in the adjacent eastern and western seas of Cheju Island.

A research of Cheju Island plain coarse pottery and pantiles magnetism characteristic

  • Yoon, Tae-Gun;Park, Won-Jun;Ko, Jeong-Dae;Hong, Sung-Rak
    • Proceedings of the Korean Magnestics Society Conference
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    • pp.413-420
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    • 2000
  • Cheju Island has nature of typical trass through volcanic activities in many times. The soil in Cheju Island has principally sprung from basalt and partially made up of trachyte, trachyte's nature and site. Also ancient relics, plain coarse pottery's kilns and pantiles kilns are homogeneously distributed all over the Cheju Island. In this study, as a result of X-ray fluorescence spectrometer and Mossbauer spectroscopy of a sample are from plain coarse pottery and pantiles in 5 regions of Cheju Island. It is thought that these samples are partially formed from neutral volcanic rock like trachyte and Atomicity state of iron is almost Fe$\^$3+/. Also the magnetic hyperfine field length of goethite, contained these samples is less than synthetic goethite magnetic hyperfine field length and this result shows that disintegration of inner magnetic order, created by partial substitution of diamagnetic positive ion containing Fe$\^$3+/ and Al$\^$3+/ in goethite lattice.

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Magnetic Characteristics of Ancient Plain Coarse Pottery and Pantiles from Cheju Island

  • Yoon, Tae Gun;Ko, Jeong Dae;Hong, Sung Rak
    • Journal of Magnetics
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    • v.6 no.1
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    • pp.5-8
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    • 2001
  • Cheju island is composed of volcanic tuff. The soil in Cheju island has principally sprung from basalt and partially made up of trachyte, and andesite. Also ancient relics, plain coarse pottery kilns and pantiles kilns are homogeneously distributed all over the Cheju island. In this study samples of plain coarse pottery and pantiles from five regions of Cheju island have been examined through X-ray fluorescence spectrometer and Mossbauer spectroscopy. It is thought that these samples be partially formed from neutral volcanic rock like trachyte and the valence state of iron is almost $Fe^{3+}$. Also the magnetic hyperfine field of goethite contained in these samples is less than synthetic goethite. This result shows the degradation of magnetic order caused by the partial substitution of diamagnetic positive ion $Fe^{3+}$ by $Al^{3+}$ in the goethite lattice.

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Residue of Organophosphorus Pesticides in the Coastal Environment on the Cheju Island (제주도 연안 해양환경 중 유기린계 농약의 잔류)

  • Kim, Jeong-Ho;O, Yun-Geun;Park, Byeong-Yun
    • Journal of Environmental Science International
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    • v.8 no.4
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    • pp.503-507
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    • 1999
  • To study the residue of organophosphorus pesticides in the ocean environment on the Cheju island, EPN[O-ethyl-O-4-nitrophenyl phenylphosphonothioate] and monocrotophos [Dimethyl-1-methyl-2-methyl carba-moylvinylphosphate] of organophosphorus pesticides are surveyed on coastal environment of Cheju city and Wimi in May and October 1996. The qualified limit detection of EPN and monocrotophos are 0.005ng/mL and 0.006ng/mL in the water by GC-FPD, respectively. The qualified limit detection of EPN and monocrotophos are 0.010ng/g and 0.012ng/g in the solid such as sediment and sea organism by GC-FPD, respectively. EPN and monocrotophos are not detected in seawater and sedimnet. Moreover EPN and monocrotophos are neither detected in seaweed cava (Ecklonia cava), Agar (Gelidium amansii), turban sell(Batillus cornutus) and sea urchin(Anthocidaris Crassispina). EPN, monocrotophos used in the farm on the Cheju island are not residued in the coastal environment in the Cheju island.

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Sequence Analysis of the Coat Protein Gene of Citrus Tristeza Virus Isolated form Cheju Island

  • Park, Hyoun-Hyang;Kim, Dae-Hyun;Hyun, Woo-Taek;Moon, Doo-Khil;Koh, Young-jin;Park, Tae-Jin
    • The Plant Pathology Journal
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    • v.16 no.1
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    • pp.43-47
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    • 2000
  • Citrus tristeza virus (CTV) is the causal agent of one of the most important diseases of citrus. Recently, CTV has been detected in Cheju Island by ELISA. The coat protein (CP) gene of CTV isolated form Cheju Island was cloned by RT-PCR and the nucleotide was analyzed in this study. Citrus leaves were collected from trees showing decline symptoms from various region of Cheju Island in the summer of 1998 and 1999. The CP gene open reading frame is composed of 670 nucleotides and encodes a polypeptide of 223 amono acids. Sequence analysis the CP gene revealed that two CTV strains present in Cheju Island. Viruses collected form Sogwipo area and Cheju City area in 1999 ahowed 91-93% nucleotide sequence homology with CTV T36 strain. Viruses collected form Cheju City area in 1999 and Sogwipo City in 1998 showed 94-98% nucleotide sequence homology with CTV SY568 strain. A efficient viral RNA extraction methods was developed by modifying procedure for animal virus RNA purification methods and PCR product was detected form one tenth of RNA purified from as small as 45 mg fresh or frozen tissue.

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Research on the Plant Distributions in Na-Ree Dong in Dagelet Island and Baik-Rok Dam in Cheju Island (울릉도의 나리동 및 제주도의 백녹담 식물분포에 관한 연구(硏究))

  • Do, Sang-Hak;Park, Su-Hyun
    • Korean Journal of Pharmacognosy
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    • v.7 no.1
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    • pp.35-40
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    • 1976
  • The plant distributions in the Na-Ree Dong in Dagelet Island and Baik-Rok Dam in Cheju Island were investigated and 143 genera, 187 species of plants were found in the Na-Ree Dong in Dagelet Island during 15 years from 1961 to 1975. From 1957 to 1975, 113 genera, 174 species of plants were found in Baik-Rok Dam in Cheju Island.

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Water Mass Distribution and Seasonal Circulation Northwest of Cheju Island in 1994

  • PANG Ig-Chan;RHO Hong-Kil;LEE Jae-Hak;LIE Heung-Jae
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.29 no.6
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    • pp.862-875
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    • 1996
  • The CTD data observed in the sea northwest of Cheju Island have been analyzed to figure out the seasonal circulation around Cheju Island. Warm and saline waters flow into the Yellow Sea through the middle region of the Yellow Sea in winter and along the west coast of Korean Peninsula in summer. On the other hand, cold and less saline waters flow out of the Yellow Sea through the middle region in summer and along the west coast of Korean Peninsula in winter. These flows make the seasonal circulation around Cheju Island. As dynamics, the monsoon wind and the variation of Kuroshio transport have been suggested. Comparing the observational result, the circulation driven by the variation of Kuroshio transport is strengthened by monsoon winds in the numerical model.

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