• Title/Summary/Keyword: 늦가을

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Variation of Water Temperature in Chungmu Port (충무항의 수온 변동)

  • Yeom, Mal-Gu;Kim, Sam-Gon
    • Journal of the Korean Society of Fisheries and Ocean Technology
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    • v.20 no.2
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    • pp.79-82
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    • 1984
  • Seasonal and secular variations of water temperature in Chungmu port were investigated with the data obtained from the Technical Reports(1976~1983) of Hydrographic Office. Monthly and annual range of water temperature were 2 to 8$^{\circ}C$ and 18 to 21$^{\circ}C$, respectively. The coefficients of variance of monthly mean water temperature were 0.015(February, 1976) to 0.208(December, 1980) and their values were smaller in the summer season than in the winter season. The result of harmonic analysis for investigating the seasonal variation of water temperature was T(t)=15.66+8.06 cos(10$^{\circ}$t-233.5)+0.92 cos(20$^{\circ}$t-216). The periods of secular variation were about 2 years and 3 years.

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방사선 조사 건고사리의 불림조작 조건에 따른 복원력 및 물리적 특성

  • 성태화;김미리
    • Proceedings of the Korean Society of Postharvest Science and Technology of Agricultural Products Conference
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    • 2003.10a
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    • pp.148.2-149
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    • 2003
  • 고사리(Pteridium aquilinum)는 참고사리과에 속하는 다년생 양치식물로서 온대지방과 열대지방에 널리 분포되어 있으며 이른봄부터 늦가을까지 산야에 생육되며 북극 남아프리카 지역을 제외한 전세계에 광범위하게 자생하고 있다. 고사리는 봄철에 어린싹을 삶아 물에 담구었다가 먹거나 건조시켜 저장해서 이용하는데 현재 유통되고 있는 건고사리는 수확, 건조 및 저장 중에 비위생적인 관리 등에 의해 미생물의 증식 및 해충의 발생 등으로 품질이 크게 저하되어 저장상 많은 어려움을 안고 있다. 방사선에 의한 식품 저장은 이미 그 건전성과 경제적 타당성이 인정되어 세계 여러나라에서 실용화되고 있으며 특히 건조 채소류의 살균, 살충을 위한 방사선의 이용은 제품의 재수화성을 증가시킨다는 보고도 있다. 따라서, 본 실험에서는 국내에서 소비량이 비교적 많은 건고사리에 Co-60 감마선을 조사하여 건고사리 조리전 필수 조리조작인 불림조작 조건에 따른 복원력 및 물리적 특성을 분석하였다. 건고사리에 조사선량을 0, 3, 5, 7kGy로 달리 하여 조사하였고 침지온도, 침지 시간에 따른 수분함량, 부피, 수화 복원력, 색상, 조직감을 측정하였다. 실험결과, 조사선량이 높을수록 부피 증가율, 수화 복원력은 대조구에 비해 유의적으로 증가하였다. 조직감 중 경도는 침지온도, 시간 및 조사선량이 증가할수록 감소하여, 건고사리를 불리기 위해 드는 시간이 단축되어 에너지 절감의 효과가 있는 것으로 파악되었다.

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The Current Number of Its Individuals and Management Plan of Roe Deer(Capreolus pygarus tianschanicus Satunin) Inhabiting Mt. Halla(Hallasan), Jeju Island, Korea (한라산에 서식하는 노루(Capreolus pygarus tianschanicus Satunin)의 개체수 현황과 관리방안)

  • Kim, Byoung-Soo;Oh, Jang-Geun;Oh, Hong-Shik
    • Korean Journal of Environment and Ecology
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    • v.21 no.4
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    • pp.366-373
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    • 2007
  • This study researched the number of individuals of Roe deer (Capreolus pygarus tianschanicus Satunin), which inhabit Mt. Halla (Hallasan) National Park and its neighboring areas ranging about $270km^2$ areas. The research was done from November(late fall), 1998 to March(early spring), 2001, and additional research was carried out from November 2006 to January 2007. As a result of this, we identified a total of 1,444 deer, and found out the fact that there lived 5.33 deer per $km^2$. By region, we identified a maximum of 270 deer at Donnaeko hiking path and a minimum of 12 deer at the adjacent areas to the second Sanrok-road. The frequency of Roe deer group sighting was higher at the edge of Hallasan National Park than any other surveyed region. Thus, it is estimated that the distribution of Roe deer of Hallasan is more influenced by the quantity and quality of food than human-made interference during wintry season.

Epiphytic Algae Growing on Sargassum thunbergii in Southern and Western Coasts of Korea (한국의 남해안과 서해안에 생육하는 지충이(Sargassum thunbergii)의 착생 해조류의 종조성)

  • 김영식;최한길
    • The Korean Journal of Ecology
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    • v.27 no.3
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    • pp.173-177
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    • 2004
  • The number and abundance of epiphytic algae growing on Sargassum thunbergii and their functional forms were examined. Thalli of S. thunbenii were collected on the nine islands of southern coast and at Gyeokpo on the western coast of Korea in summer 2001. A total of 25 species, 6 green (24%), 2 brown (8%), 17 red algae (68%) were identified in the present study. Caulacanthus okamurae, Ulva pertusa, Sphacelaria furcigera were found on the thalli of S. thunbegii that collected at the all regions. Caulacanthus okamurae, Champia bifida and Laurencia venusta grew on the lower parts of S. thunbergii thalli whereas, Polysiphonia spp. attached to the apical parts of the plants. Four functional forms, such as sheet-form (8%), filamentous-form (52%), coarsely branched-form (32%) and articulated-calcareous algal form (8%) were distinguished. The epiphytic algae on the thalli of S. thunbergii are mainly annual opportunistic algae, filamentous-form algae and smaller red algae. Also, most epiphytic seaweeds of S. thunbergii produce and release spores before pseudoperennial host plants are necrotic in late autumn.

The Ecological Study of Phytoplankton in Kyeonggi Bay, Yellow Sea -IV. The Successional Mechanism and the Structure of the Phytoplankton Community (서해(西海) 경기만(京幾灣) 식물(植物) 플랑크톤에 대(對)한 생태학적(生態學的) 연구(硏究) -IV. 식물(植物)플랑크톤의 군집구조(群集構造)와 계절적 천이 기작)

  • Choi, Joong Ki;Shim, Jae Hyung
    • 한국해양학회지
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    • v.23 no.1
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    • pp.1-12
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    • 1988
  • To clarify the community structure of phytoplankton in the Kyeonggi Bay, the community analysis were performed to investigate the relationship between the environmental factors and the phytoplankton communities. Low diversity with occurrence of few dominant species throughout the year, except summer, implies that ecological environment of this study area is very unstable due to incessant physical perturbation and large fluctuation of other environmental factors. According to the results of the cluster analysis this study area could be divided into river discharge, polluted and unpolluted area. Principal component analysis of overall phytoplankton community in this area clearly showed four seasonal succession patterns grouped into the spring type, the summer type, the late summer type, the late autumn-winter type. Summer communities composed of common phytoplankton are highly correlated with temperature and transparency. Winter communities composed of most tychopelagic plankton are positively correlated with suspended substances and nutrient, while negatively correlated with transparency.

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Comparative Study of Cool-Season Turfgrass Varieties Introduced (한지형 잔디의 품종비교)

  • 권찬호;김석정
    • Asian Journal of Turfgrass Science
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    • v.12 no.3
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    • pp.215-224
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    • 1998
  • These experiments were conducted to compare the growth characteristics, cold and drought tolerances, disease tolerance and color of the 23 varieties of four different species of cool-season turfgrass introduced from the United States of America and Europe at Yonam College in 1995. Newport and Glade of 8 Kentucky bluegrass varieties were recorded better marks than others. Newport variety was recorded the good marks in the disease tolerance of summer seasons, uniformity, coverage and texture, but the bad marks in color, drought tolerance and rust tolerance and stay green of automn seasons. Glade variety was recorded the good marks in the disease tolerance of summer seasons, uniformity and coverage, but the bad marks in drought tolerance, texture and Pythium blight tolerance. Revel and Revel Jr of 5 tall fescue varieties were recorded better marks than others in color, shoot density, uniformity, coverage, and tolerance of Pythium and Fusarium blight disease. All of red fescue varieties died of disease for rainy season however texture was the finest of all the species in spring season. Dandy of 4 ryegrass varieties was recorded better marks than others in color, shoot density, coverage, drought tolerance and tolerance of Pythium and Fusarium blight disease but texture.

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Changes of Fruit Yield and Fresh Sprout Characteristics by Sowing Times on Chayote in Central Area of Korea (중부지방에서 파종시기별 차요테 과실 생산량 및 어린순 특성 변화)

  • Park, Eui Kwang;Jeong, Taek Gu;Lee, Min Jeong;Park, Jae Seong
    • Proceedings of the Plant Resources Society of Korea Conference
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    • 2018.10a
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    • pp.67-67
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    • 2018
  • 차요테(Sechium edule L.)는 중앙아메리카와 멕시코 남부가 원산인 박과 채소로 찜, 볶음, 튀김, 수프, 샐러드로 활용되는 아열대 채소다. 어린 순은 양념으로 무치거나 볶아서 나물로 이용되고, 열매는 샐러드, 수프, 볶음, 절임 등으로 이용된다. 동양에서는 뿌리채소로 이용되는 무(Raphanus sativus L.)와 유사하게 활용되고 있기도 하며, 인도네시아에서는 칠리 소스, 기름 등에 볶아 먹거나, 삶아서 양념을 찍어 먹기도 한다. 영양학적으로 열매에는 엽산, 비타민 C, 비타민 B6, 구리(Cu), 마그네슘(Mg) 등 미네랄이 풍부하며, 특히 칼륨(K)이 많이 함유되어 있다. 생태적으로 아열대지역에서는 다년생이지만 우리 나라에서는 일년생으로 취급하여, 봄에 정식하여 가을철에 개화되며, 늦가을에서 초겨울까지 열매를 수확한다. 본 연구는 중부지방에서 차요테 열매의 수확량이 줄어들지 않으면서, 차요테의 어린 순을 수확할 수 있는 재배기술을 개발하기 위하여, 2017년에 이어 2018년에도 동일한 처리로 시험을 수행하였다. 시설하우스에서 $2{\times}3m$ 간격으로 2018년 2월 9일부터 4월 21일까지 15일 간격으로 6회 파종하였고, 처리별로 발아시, 발아기, 발아전, 초장, 엽수, 엽록소함량, 어린순 수확량 등을 조사했다. 4차 처리구인 3월 23일 파종의 경우 발아시(최초 발아일)는 파종 후 4일이 소요되어, 1차 처리구 2월 10일 파종 보다 18일 빨랐고, 발아기(40% 발아)는 파종 후 10일로 24일 빨랐으며, 발아전(80% 발아)은 파종 후 16일로 25일 정도 더 빨리 발아되는 경향이었다. 정식 후부터 6월 하순까지 어린순 생산량은 4차 파종 시 773 g주$^{-1}$로 1차 파종 785g주$^{-1}$와 차이가 없을 정도로 생육이 좋았지만, 5차 파종 및 6차 파종의 경우 생산량이 저조하였다. 따라서, 하반기 과실 생산량을 추가적으로 조사하고, 어린순 생산량과 비교하여 중부지역 차요테의 최적 파종시기를 정할 수 있을 것으로 판단되었다.

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Change in Species Composition of Fish in Chonsu Bay 3. Pelagic Fish (천수만 어류의 종조성 변화 3. 부어류)

  • LEE Tae Won
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.31 no.5
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    • pp.654-664
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    • 1998
  • Seasonal variation in species composition and abundance of pelagic fish in Chonsu Bay were determined by analyzing monthly samples collected using a set net from March, 1992 to January, 1993. The data in this study were compared with those of 1981$\~$82. Of 63 species identified, Engraulis japonicus, Ammodytes penonatus, Enedrias fangi and Sardinella zunasi predominated in abundance. Especially E.japonicus occupied $87\%$ of total number of individuals. In spling, fish abundance increased by recruitment of lariat E. fanti as well as adults of E. japonicus, A. personatus and S. zunasi. These adults moved towards the open sea after spawning in early summer. A large number of juveniles was then collected from August until December. The seasonal change in species composition from the present study showed a similar trend to that occurred in 1981$\~$82. However, larger number of pelagic fish was caught in 1992$\~$93 than in 1981$\~$82. This result seems to be related to the higher water temperature (>$2^{\circ}C$) than the average mean temperature in spring and autumn, implying that higher temperature provides favorable conditions for spawning and growth of the fish.

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Survey on the Spiders of the Rice Paddy Field ( I ) (논에 서식하는 거미의 조사(I))

  • Choi Seong Sik;Namkung Joon
    • Korean journal of applied entomology
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    • v.15 no.2 s.27
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    • pp.89-93
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    • 1976
  • The present report is dealt with the spiders which are caught within a space of $1m^2$ of rice paddy field where was harvested the rice crops in Jeonbug district, from November 4 to 11, to 1975. 1. Twenty-one species of spiders were caught at the area during the period. Of these the dominant species were Gnathonarium dentatum, Pirate subpiraticus, Gnathonarium gibberum, Oedothorax insecticeps etc. 2. Average density of spiders within a space of $1m^2$ of rice paddy field where rice crops was harvested was as follows: 125 at Iri, 102 at Jinan, 133 at Buan, and 58 at Daejang. 3. The scientific names of spiders which were caught in rice paddy field for the first time in Korea were Gnathonarium gibberum, Enoplognatha japonica, Erigone prominens, Erigonidium graminicola, Theridion octomaculatum, Lycosa pseudoannulata, Dolomedes angustivirgatus. As the result of this survey, fifty-five species of spiders were recorded in rice paddy field of Korea.

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Evaluation of Occurrence of Yellow Patch Caused by Rhizoctonia cerealis of Cool Season Turfgrass Cultivars and Species (한지형 잔디의 종과 품종 간에 황색마름병의 발생 평가)

  • Chang, Tae-Hyun;Lee, Yong-Se
    • Asian Journal of Turfgrass Science
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    • v.24 no.1
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    • pp.24-30
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    • 2010
  • We investigated occurrence of yellow patch for early spring season of 48 cultivars in 5 species of turfgrass, most popularly used in Korea golf courses. Only yellow patch disease caused by Rhizoctonia cerealis was occurred naturally from late fall season. Perennial ryegrass and creeping bentgrass cultivars showed susceptibility from yellow patch in early spring, respectively. However, among There was no significantly different between the other species. Creeping bentgrass, 'Pennlinks II' cultivar was the most susceptible. Yellow patch symptom showed reddish brown with margins in color and patch showed size from 5 cm to 50 cm in diameter. Based on our results, Yellow patch showed large differences among cultivar and each turfgrass species.