• 환경영향평가
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• 제23권5호
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• pp.364-378
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• 2014

과거 50여 년간 한국의 생태발자국(Ecological Footprint, EF)은 가파르게 증가해 왔으며, 이에 따라 오버슈트(Overshoot) 역시 증가해 왔다. 오버슈트를 야기하는 중요한 원인에는 인구 증가와 일인당 자원 사용 강도 증가가 있다. 본 연구에서는 이들 원인 가운데 어떤 변수가 지난 50여 년간 한국의 EF에 더 큰 영향을 미쳤는지에 대해 알아보았다. 소비 부문들 가운데, 에너지 소비에 따른 탄소발자국(Carbon Footprint, CF), 단백질 섭취에 따른 초지발자국(Grazing Land Footprint)과 어장 발자국(Fishing Grounds)이 EF 증가에 크게 영향을 주었다. 지난 50여 년간의 추세가 앞으로도 유지된다면, 2060년에는 일인당 EF 값이 2009년 현재의 2배에 달할 것으로 보이며, 2031년 이후 인구가 감소함에도 불구하고 1인당 EF 값의 증가에 따른 영향으로 EF는 2059년까지 증가할 것으로 보인다. 그러므로 향후 개개인의 소비 패턴과 행동 변화를 유도하는 것으로 환경관리 방향을 전환해갈 필요가 있을 것이다.

• 한국임상수의학회지
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• 제26권6호
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• pp.515-519
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• 2009

국내 전주, 광주 그리고 제주에서 고양이, 더러브렛 말, 홀스테인 소로부터 진드기 매개성 인수공통 병원체인 Anaplasma phagocytophilum과 Ehrlichia chaffeensis에 대한 항체가 조사를 위하여 면역형광항체법을 이용하였다. 본 연구를 위하여 254마리의 혈청(33마리의 애완 및 길거리 고양이, 92마리의 방목장 말 그리고 129마리의 방목장소)을 수집하였다. 33마리의 고양이 중에서 6마리가 A. phagocytophilum(titer $\geq$ 80)에 대한 양성항체가 검출되어 18.2%의 양성율을 나타내었으며, 1마리에 있어서는 E. chaffeensis에 대한 항체가 검출되어 3%의 양성율을 나타내었다. 소에 있어서는 129마리 중에서 1마리에서 그리고 말에 있어서는 92마리 중에서 2마리에서 A. phagocytophilum에 대한 양성항체가 검출되어 각각 0.8%와 2.2%의 양성율을 나타내었으나 E. chaffeensis에 대한 항체는 모두 음성 결과를 나타내었다. 이 결과는 국내 사육 고양이, 말 그리고 소에 있어서 A. phagocytophilum과 E. chaffeensis에 대한 혈청학적 양성결과로서 국내에서 처음 보고되는 자연감염 예이며, 진드기 서식지역의 방목동물에서는 이들 질병의 감염으로 경제성 손실이 우려되며 예방대책이 마련되어야 할 것으로 판단된다.

• 한국수정란이식학회지
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• 제19권1호
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• pp.53-59
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• 2004

본 실험은 한우 400두를 공시하여 사양조건에 따른 blood urea nitrogen(BUN)의 농도가 암소의 번식에 미치는 영향을 조사하였으며 또한 body condition score(BCS)가 번식효율에 미치는 영향을 조사하였다. 1 화본과 식물이 주종인 초지에서 방목을 하였을 때 BUN의 평균농도는 7.39$\pm$2.65 mg/㎗ 이었으며 발정이 육안적으로 확인된 암소의 58.2%가 4∼8 mg/㎗ 사이에 분포하였으며 수태율도 높은 경향을 보였다. 2.사사기 농후사료를 급여하였을 때 BUN의 평균 농도는 12.36$\pm$2.92 mg/㎗이었으며 8∼14 mg/㎗사이에서 높은 수태율을 보였다. 3. BCS가 2.5∼3.5사이에 있을 때 분만 후 발정재귀가 가장 빠르게 나타났으며 수태율도 높은 경향을 나타내었다. 4. 방목기, 사사기에서 BUN과 BCS상호간의 다소의 차이는 있었으나 유의성은 인정되지 않았다. 이상의 결과를 종합해 보면 사양조건에 따라 적정 BUN및 BCS의 수준을 유지할 때 번식의 효율을 증대시킬 수 있을 것이라 사료된다.

• Journal of Ecology and Environment
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• 제29권2호
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• pp.165-169
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• 2006

As a Biodiversity Management Plan in S. Korea, barley fields are being prepared for the wintering migratory birds. However, the effectiveness of barley fields as a feeding habitat has not been evaluated. In 2003/04 wintering period, we installed exclosures in the barley fields to evaluate the waterfowl grazing effectiveness. Approximately 8,000 waterfowls used the Dongup Reservoir System and utilized the barley fields during the daytime. The white-fronted goose Anser albifrons occupied more than 90% of the all barley-feeding waterfowls. Waterfowls significantly impacted to the shoot density and biomass of barley. In the closed plot, barley shoot density gradually increased to $267{\pm}27/m^2$ in January, 2004. Shoot density in open plots (site 1) declined sharply from.15 December ($189{\pm}18/m^2$) to 5 January 2004 ($25{\pm}11/m^2$). However, barley shoot density in open plots (site 2) was stable in January 2004 because of human disturbances. The changes in barley biomass and shoot density showed similar trend in both open and closed plot. From the exclosure experiment, it was clear that barley fields were important feeding habitat for wintering waterfowls in this area. Further, human disturbances such as noise from traffic and other human activities (farming and hiking) had significant impact on waterfowls' grazing activity. Collectively, winter barley fields were effective for waterfowl feeding, but the location of barley fields should be carefully selected for the maximum utilization of the barley feeding.

• Asian-Australasian Journal of Animal Sciences
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• 제17권5호
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• pp.638-642
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• 2004

In Australia, many cropping areas are affected by salt. In these regions, Chenopodiaceous plants, such as Atriplex, Kochia and Bassia spp have been planted to improve soil conditions. These plants have become invaluable feed resources for grazing animals in dry summers, but have a high sodium content. To assess the impact of high salt intake on grazing deer, two experiments were conducted. The first experiment used 30 fallow weaner deer to examine the effect of salt level in the diet on feed intake, water intake and body weight of fallow deer. Salt was added to lucerne chaff at 0, 1.5, 3.0, 4.5 and 6% and fresh water was offered all the time. Increasing the salt level in the diet from 0 to 6% didn't affect feed intake, osmotic pressure and mineral concentration in blood of fallow deer. However, water intake was significantly higher (p<0.05) in deer fed diets containing more than 3% salt. Body weight was lower (p${\leq}$0.056) for fallow deer in July and August when salt content was over 3%, suggesting they can ingest over 15 g sodium/day without significant depression in both feed intake and growth rate if the fresh water is available. In the second experiment, 18 red weaner deer were fed lucerne chaff diets containing 1.5, 4.5 and 6.0% salt with 6 deer/diet. The results revealed that feed intake and blood osmotic pressure were similar (p>0.05) for red deer fed different levels of salt although the feed intake declined from 1.91 to 1.67 kg with the increase of salt level from 1.5% to 6.0% in the diet. Water intake was significantly higher for deer fed diets containing over 4.5% salt, but there was no difference in body weight during the experiment. However, no recommendation can be made on the salt tolerance of red deer due to limited increment of salt level in the diet.

• Fisheries and Aquatic Sciences
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• 제24권12호
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• pp.415-427
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• 2021

Wetland ecosystems act as natural freshwater purification systems, but their rich biodiversity is being threatened with the introduction of the non-native freshwater snail, Pomacea canaliculata. This study was conducted to measure the herbivory effects and growth rate of P. canaliculata on common macrophytes: Ipomoea aquatica, Ipomoea batatas, Pandanus amaryllifolius and Cucurma longa. In separate experiments, the macrophyte species were served as the snails' food as individual species and simultaneously. In the individual treatment, the growth pattern and rate were based on the snails' weight (mg/snail/day; n = 9) while the individual feeding consumption (mg/snail/day) was calculated from the leftover food. In the simultaneous treatment, the herbivory effects were evaluated as the feeding preference (%) from observations every two hours, while the total feeding consumption (mg) was calculated based on the food remaining after a 12-hour experiment (3 replicates: total n = 27). The results indicated that the growth pattern was significant for snails grazing on I. aquatica but not when other macrophyte species were eaten. The individual feeding consumption was higher when using I. aquatica than P. amaryllifolius but the growth rate for snails grazing on I. aquatica and P. amaryllifolius did not differ significantly. Meanwhile, the consumption of C. longa deterred the snails' growth rate. Although the snails consumed all the macrophytes in the individual experiment, when given the species simultaneously, the feeding preference and total feeding consumption were directed significantly more toward I. aquatica than P. amaryfollius and C. longa. We conclude that P. canaliculata is a generalist feeder given a limited choice of food but tends to show a strong feeding preference after being introduced to more food choices. These findings indicate that the introduction of P. canaliculata into wetland ecosystems may increase the herbivory effects on macrophytes, making these ecosystems vulnerable to the impact of eutrophication and biodiversity reduction.

• The Korean Journal of Ecology
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• 제12권3호
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• pp.145-160
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• 1989

Daehuksan Island (125°23'-125° 28' E and 34°37'-34°42' N, ca 19.7㎢) in the southwestern part of Mokpo, Korea, is a part of the Dadohae National Marine Park. Most of the actual vegetation of the island is substitutional vegetation under various human impact such as grazing, cutting for firewood. And natural vegetation is partially distributed in the tutelary shrine forests, deep valleys, etc. During 1987, phytosociological investigation of this was carried out on the basis of Braum-Blanguet's method. The forest vegetation was classified into 1 association and 7 communities, Camellia japonica, Machilus thunbergii, Ardisio-Castanopsietum sieboldii, Daphniphyllum macropodum-Quercus acuta, Pyrrosia lingua-Pinus densiflora. Rhododendron mucronulatum-Pinus thunbergii, Carpinus coreana, and Psedosasa japonica community. Grassland vegetation was classified into Gleichenia japonica, Gleichenia dichotoma, Arundinella hirta-Miscanthus sinensis, Artemisia princeps var. orientalis. Imperata cylindrica var. koenii Artemisia princeps var. orientalis-Pennisetum alpecuroides, Carex boottiana, and salt marsh vegetation. Thypa orientalis, Spergularia marina, Phragmites communis, Carex scabrifolia, and Triglochin maritimum community. Based on them, the actual vegetation map was made in 1:50,000 scale.

• The Korean Journal of Ecology
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• 제13권3호
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• pp.181-190
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• 1990

Chodo Archipelago ($125^{\circ}$45 $-126^{\circ}$13 E and $34^{\circ}$15 $-34^{\circ}$25 N, ca. $56.7km^2$), a part of the Dadohae National Marine Park, largely is covered with substitutional vegetation under various human impact such as grazing, cutting for firewood. However natural vegetation is partially distributed in the tutelary shrine forests, deep valleys and etc. From October 1988 to June 1989, phytosociological investigation of this forest vegetation was carried out by Braun-Blanquet s method. The forest vegetation was classified into 1 association and 7 communities. Ardisio-Castanopsietum sieboldii, Machilus thunbergii, Quercus acuta, Litsea japonca, Eurya japonica-Pinus thunbergii mixed forest, Pinus densiflora, Pinus rigida afforestation. Carpinus coreana community. Based on the classification, the actual vegetation map was drawn in 1 : 50,000 scale.

• 한국환경과학회지
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• 제15권4호
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• pp.385-386
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• 2006

In 2005, harmful dinoflagellate Cochlodinium polykrikoides was first occurred on July 18 and disappeared on September 12 in the Yeosu waters of the South Sea of Korea. During C. polykrikoides blooms, the species of Protoperidinium was isolated from Jabong Island in Yeosu in the middle of August, 2005. The surface water temperature at the sampling site was $25^{\circ}C$, and salinity was 33.1 psu. The specimen was somewhat large in size and was longer than its width. The shape was close to being ovoid, with an apical horn. This study discovered cells with colorless and transparent ingested chain-forming C. polykrikoides. However, this species was not abundant, implying low grazing impact on C. polykkoides.

• 한국전산유체공학회:학술대회논문집
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• 한국전산유체공학회 2008년도 춘계학술대회논문집
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• pp.320-323
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• 2008

In this study the effect of collision model was evaluated in spray field by CFD. A collision is basically the interaction between droplets and criteria of collision is determined by drop Weber number, impact parameter, and drop-size ratio. Early developed collision model considered coalescence and grazing collision with the exchange of momentum. However in experimental research there were bouncing, coalescence, reflexive separating and stretching separating in interaction between droplets. In this study the collision considering such complex phenomena is modeled and was compared with the basic collision model.