• Title/Summary/Keyword: Jeju-do, Korea

Search Result 628, Processing Time 0.025 seconds

Habitats Ecological Characteristics of Asplenium scolopendrium L. and its RAPD Analysis

  • Ok, Gil-Hwan;Yoo, Ki-Oug
    • Korean Journal of Plant Resources
    • /
    • v.25 no.6
    • /
    • pp.719-730
    • /
    • 2012
  • This study was conducted to investigate the environmental characteristics of natural habitats, and the genetic variations in samples from 19 different quadrates of Asplenium scolopendrium 10 habitats. The natural habitats of A. scolopendrium were located at an altitudes 110-973 m with inclinations of $7-30^{\circ}$. All the quadrates were located on north facing slopes. The average field capacity of the soil is 31.4%, with organic matter at 16.7%, and the pH is 5.84. The soil texture was confirmed as sandy loam in 8 habitats and silt loam in 2 habitats. A total of 214 vascular plants were identified from 10 habitats. The importance value of the herbaceous layer (H) was the highest in A. scolopendrium, at 10.4%, followed by Arachniodes standishii (7.3%), Dryopteris crassirhizoma (6.5%), and Polystichum tripteron (5.3%), which implies that the natural habitats of A. scolopendrium are affinity with ferns. The species diversity of A. scolopendrium was estimated as on average 1.09, while the dominance and evenness were 0.12 and 0.87, respectively. The result of the RAPD analysis, among 59 bands amplified with a primer, 25 (42.4%) showed polymorphism. Twenty-one individuals of 10 habitats could be classified into four groups with similarity coefficient values ranging from 0.74 to 1.0. Mt. Mullae and Geumdaebong populations shows basal branching within the 21 individuals. Ulleung-do island and Jeju-do island population forms an independent clade, respectively. Mt. Moak and Byeonsan-bando clade formed a sister to the Ulleung-do island and Jeju-do island clade.

Age and life history of an old black pine (Pinus thunbergii Parl.) tree at Cave Temple on Mt. Sanbangsan, Jeju Island, Korea, died due to pine wilt disease in 2013

  • Kim, Eun-Shik;Lee, So-Hee;Kim, Joon-Bum;Kim, Chan-Soo;Yoon, Bong-Taek;Lee, Sung-Hoon;Lim, Wontaek;Kim, Hyojung;Choi, Junghwan;Han, Hyerim
    • Journal of Ecology and Environment
    • /
    • v.38 no.1
    • /
    • pp.85-93
    • /
    • 2015
  • In 2013, the epidemics of pine wilt disease caused by the pine wood nematodes (Bursaphelenchus xylophilus) resulted in damages to the forests of black pine (Pinus thunbergii Parl.) trees in Jeju Island, Korea. Among the affected trees, an old black pine tree at Cave Temple on Mt. Sanbangsan was included and died due to the prevalence of pine wilt disease. The tree was on Mt. Sanbangsan, which was designated as a National Scenic Place with the Number 77 and was believed to be more than 400 years old in age. By examining the disc of the tree stem obtained from the height of 2 m, we counted the tree rings from 4 different directions and cross-dated the readings by comparing the records of drought simulated from the BROOK Model. Our analysis indicates that the tree seems to have grown since late 1860s. Contrary to the belief of the general public, we can conclude that the age of the tree was estimated to be at maximum 150 years, which means that it was not the same old tree as was shown in the painting of the Tam-Ra-Sun-Ryeok-Do (an old painting book for the Inspection Tour of Jeju Island) published in 1702. Discussion was extended to the life history of the tree in growth and leaning and the measures to protect the tree species from the damages of the pine wilt disease caused by pine wood nematodes.

Energy Content and Photosynthetic Efficiency of Quercus mongolica Stands in Korea

  • Kwon, Ki-Cheol;Lee, Don Koo
    • Journal of Korean Society of Forest Science
    • /
    • v.95 no.5
    • /
    • pp.562-568
    • /
    • 2006
  • This study was conducted to examine the energy content and photosynthetic efficiency of Quercus mongolica stands in Korea. Study sites were located in Mt. Joongwang, Gangwon-do (1,000 m and 800 m above sea level), Mt. Baekwoon, Jeollanam-do (800 m a.s.l.), Mt. Halla, Jeju-do (1,000 m a.s.l.), Mt. Taehwa, Gyeonggi-do (350 m a.s.l.), and Mt. Wolak, Chungcheongbuk-do (300 m a.s.l.). Total energy content and annual energy accumulation in Q. mongolica stands were 2,916-6,435 GJ/ha and 284-441 GJ/ha, respectively. Lower latitude (N.L.) stands of Q. mongolica showed higher energy contents than higher latitude stands, but Quercus stands in Mt. Baekwoon had higher annual energy accumulation than those in Mt. Halla located at a lower latitude. During the growing season, the photosynthetic efficiency of 60 to 70-year-old Q. mongolica stands ranged from 1.19 to 1.34% while that of 35-year-old stands did from 1.87 to 1.95%. There were no significant differences in photosynthetic efficiency among the latitudes because solar radiation was higher in low latitudes.

A New Record of Collix stellata (Lepidoptera: Geometridae) from Korea

  • Choi, Sei-Woong;Na, Sang-Hyun
    • Animal Systematics, Evolution and Diversity
    • /
    • v.27 no.2
    • /
    • pp.164-166
    • /
    • 2011
  • We report a larentiine species, Collix stellata Warren, for the first time from Korea. Two males and one female were collected from Jeju-do Island, South Korea. Collix stellata is similar to Collix ghosa Walker in external appearances, but can be distinguished by the relatively larger discal dot on forewing and the relatively slender valva with distally projected margin of male genitalia. Diagnosis and description of the species are given with the figures of the genitalia.

Three Unrecorded Triphorid Snails of Genus Triphora (Caenogastropoda, Triphoridae) from Korea

  • Kil, Hyun-Jong;Lee, Yong-Seok;Lee, Jun-Sang
    • The Korean Journal of Malacology
    • /
    • v.29 no.3
    • /
    • pp.259-262
    • /
    • 2013
  • The specimens of three unrecorded triphorid snails, Mastonia millepunctata, Monophorus testaceus, and Obesula turricula were collected from Jeju-do, Korea and diagnostic characters were analysed. As a result, the family Triphoridae in Korea turned out to be 18 species revised species catalogue are listed.

Local Relations between Precipitation and Underwater Level and Efficient Management Plan of Underwater in Jeju-do (제주도 지역별 강수량과 지하수위의 관계와 효율적 관리 방안)

  • Pang, Ig-Chan;Kim, Ki-Pyo;Lee, Joon-Ho;Kim, Seong-Baeg
    • Proceedings of the KAIS Fall Conference
    • /
    • 2010.11b
    • /
    • pp.1029-1032
    • /
    • 2010
  • 제주도의 강수량과 지하수위 상승의 관계와 비강수 때의 지하수위의 하강속도를 분석한 결과 제주도 동쪽 지역은 강우가 왔을 때 지하수위의 상승이 높지 않은데 비해 하강속도는 느리며 서쪽 지역은 강우에 의해 지하수위가 많이 상승하나 비가 오지 않으면 수위가 빨리 하강하였다. 제주도의 최대 함양 부피는 강수량이 가장 많았던 2007년 태풍 나리 때 $1.67{\times}10^{10}m^3$로 나타났다. 만약 현재 추산되고 있는 제주도의 함양률 46.1%를 적용한다면 이 때의 함양량은 $0.34{\times}10^9m^2$이며 공극률은 약 5% 정도가 될 것으로 추정된다. 지하수위의 변동은 강수량에 의해 좌우 되는데 2001-2009년간의 평균 변동폭은 5.53m이다. 변동 폭이 많이 오른 때는 대부분 태풍이 지나간 후이며 가장 높은 변동폭은 2007년 9월에 태풍 나리 후의 14.74m이다. 최저의 평균 상승폭이 1m도 되지 않은 경우가 있으며 이럴 경우 심각한 물부족 현상이 나타날 수 있을 것으로 보인다. 강수량과 지하수위 관계를 분석한 결과 지하수를 대규모로 사용할 필요가 있을 때는 동쪽보다 서쪽지역이 유리한 조건을 가지고 있으며, 지하수위 상승폭이 작고 지하수위가 급격하게 낮아질 경우 지하수 사용량을 제한할 필요가 있을 것으로 보인다.

  • PDF

Functional Characteristics of Lactic Acid Bacteria Isolated From Jeju Island Traditional Fermented Food (제주지역 전통발효식품에서 분리한 유산균의 기능적 특성)

  • Kang, Min-Gyun;Jo, Du-Min;Oh, Do Kyung;Song, Ye-Jun;Kim, Young-Mog;Park, Seul-Ki
    • Korean Journal of Fisheries and Aquatic Sciences
    • /
    • v.54 no.5
    • /
    • pp.733-741
    • /
    • 2021
  • Jeju island is the largest island of South Korea, and has a relatively warm climate due to its geographical characteristics. These features have fostered development of various fermented foods distinct to Jeju island. Therefore, the functional activity of the lactic acid bacteria (LAB) isolated from the Jeju region's traditional fermented foods, including Kimchi and Jeotgal was characterized in this study. Fifteen strains were isolated from 6 types of fermented food. These strains include Enterococcus spp., Lactoplantibacillus spp., and Weisella spp. Several experiments were carried out to assess functional characteristics including acid resistance, bile resistance, hemolysis, DPPH and ABTS radical scavenging activity, and cholesterol-lowering activity. Three isolated strains (J-4, J-6 and J-10) exhibited high acid resistance, while the other 3 isolates (J-1, J-4 and J-6) showed high bile salt resistance. The strains displayed varied DPPH and ABTS radical scavenging activity: 71.14-86.42% among the first 3 strains, and 50.11-75.11% among the remaining 3 strains. Cholesterol-lowering activities were in the range 15.74-82.90% for all isolated strains. In conclusion, these studies suggest that isolated LAB strains from Jeju island traditional fermented foods possess the potential for broader application in the food industry.

The Spider Fauna of lsl. Ulreng-do (Dagelt), Korea (울릉도의 거미상)

  • Namkung Joon;Paik Nam-keuk;Yoon kyung-il
    • Korean journal of applied entomology
    • /
    • v.20 no.1 s.46
    • /
    • pp.51-58
    • /
    • 1981
  • Hitherto 44 species belonging to 19 families of spiders have been reported at Ulreung-do on the East Sea. Korea. The authors have investigated spider fauna, through out the Ulreung-do, during July 25, August 3. 1975 and July 30, August 7, 1980. The foundings were as followings. 1) In this report, 132 species of 74 genera, including 3 undetermined species, belonging to 25 families of spiders are tabulated by the aid of published data and collections of the authors. Eighty six species are added to the fauna, of which 2 species are new to Korea. as follows; Porrhomma montanum Jackson. 1918, Clubiona neglecta O.P. Cambridge, 1862. The spider fauna of Ulreung-do includes 18 nothern species $(14.0\%)$, 8 southern species $(6.2\%)$. 7 cosmopolitan species $(5.4\%)$ and 84 Palaearctic temperate species $(65.1\%)$. The predominant species are Araneids. Thridiids, especially Cyclosa japonica Boes. et Str. are found in large numbers all over this island. Linyphiids and Lycosids are relatively few in number. 3) The common species to comparative area and foreign countries are as follows; Ulreung-do/Jookbyeon...76 species$(43.3\%)$ Ulreung-do/Jeju-do...95 species$(40.6\%)$ Ulreung-do/Heuksan do...61 species$(35.7\%)$ Ulreung-do/Deogjeog-do...51 species$(31.7\%)$ Ulreung-do/Tsushima Isl....71 species$(30.3\%)$ Ulreung-do/Japan...112 species$(11.3\%)$ Ulreung-do/main China...59 species $(6.5\%)$ 4) The ecological distribution are as follows; The seashore region...81 species$(62.8\%)$ The evergreens region...73 species$(56.6\%)$ The highiands region...64 species$(49.6\%)$ The valleys region...49 species$(38.0\%)$ The basin region...23 species$(17.8\%)$ 5) The noticeable one of geographical distribution in this island, are as follows; Nesticus quelpartensis Paik et Namkung, 1969, Conoculus simboggulensis Paik, 1971.

  • PDF

Spatio-Temporal Patterns of Extreme Precipitation Events by Typhoons Across the Republic of Korea (태풍 내습 시 남한의 극한강수현상의 시.공간적 패턴)

  • Lee, Seung-Wook;Choi, Gwangyong
    • Journal of the Korean association of regional geographers
    • /
    • v.19 no.3
    • /
    • pp.384-400
    • /
    • 2013
  • In this study, spatio-temporal patterns of extreme precipitation events caused by typhoons are examined based on observational daily precipitation data at approximately 340 weather stations of Korea Meterological Administration's ASOS (Automated Synoptic Observation System) and AWS (Automatic Weather System) networks for the recent 10 year period (2002~2011). Generally, extreme precipitation events by typhoons exceeding 80mm of daily precipitation commonly appear in Jeju Island, Gyeongsangnam-do, and the eastern coastal regions of the Korean Peninsula. However, the frequency, intensity and spatial extent of typhoon-driven extreme precipitation events can be modified depending on the topography of major mountain ridges as well as the pathway of and proximity to typhoons accompanying the anti-clockwise circulation of low-level moisture with hundreds of kilometers of radius. Yellow Sea-passing type of typhoons in July cause more frequent extreme precipitation events in the northern region of Gyeonggi-do, while East Sea-passing type or southern-region-landfall type of typhoons in August-early September do in the interior regions of Gyeongsangnam-do. These results suggest that when local governments develop optimal mitigation strategies against potential damages by typhoons, the pathway of and proximity to typhoons are key factors.

  • PDF