• 대기
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• 제18권4호
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• pp.355-365
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• 2008

Synoptic and climatological characteristics of heat waves over Korea and Europe as well as their biometeorological impacts were compared. In July of 1994, excess deaths of about 2,388 in the population of South Korea are estimated by the modified excess death calculation algorithm ofKysely (2004). The excess deaths correspond to the net mortality increase of 12.5% in July of 1994 if we compare the estimated value to the expected number of deaths in this month (i.e., about 19,171). The comparative study of heat waves in Korea and Europe shows that the record-breaking heat waves in both regions are closely associated with prolonged droughts. In particular, reduction of soil moisture, precipitation and cloud cover and enhancement of insolation during the drought periods are very likely to be related to the increase in the intensity and the duration ofheat waves. Climate models predict that the frequency, intensity, and duration of heat waves in the 21 st century will be greatly enhanced in both areas. In order to reduce the biometeorological and socioeconomic impacts due to heat waves, not only the development of heat-related mortality prediction model that can be widely applied to many climate regimes, but also studies on the climatological association between extreme temperatures and abnormal hydrological cycle are needed.

• Journal of Plant Biotechnology
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• 제37권4호
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• pp.400-407
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• 2010

Zoysiagrass (Zoysia japonica Steud.), also called Korean or Japanese lawngrass, is the most popular warm-season turfgrass in Korea and is widely used for home lawns, parks, roadsides, golf courses and athletic fields. Its use is rapidly expanding in Korea and the other countries, due to its excellent characteristics which include tolerance to heat, drought and salinity. As the utilization area of this turfgrass increases, there is an increase in the demand for improved cultivars with disease and insect tolerance or with herbicide-tolerance or with extended greening periods. Conventional breeding methods have been used to improve the traits described above with limited success. However, with the advances in biotechnology, genetic transformation can be utilized for turfgrass improvement. In this paper, we review recent progress in biotechnological improvement of zoysiagrass and discuss future molecular breeding of this species.

• 한국작물학회지
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• 제36권4호
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• pp.370-381
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• 1991

$\ulcorner$농사직설$\lrcorner$ 단계에서는 품종보다는 품종군 또는 도종류로서의 조만, 치갱유, 또는 몇몇 지방 품종명이 소개되는 정도였으나, 우리나라의 도작기상이 ‘조한만수의’ 특징을 보일 뿐만 아니라 만하의 풍우 때문에 이들 재해를 회피하여 안전수확을 하는 것이 가장 중요하였으므로 15세기 이후의 도종발달은 조파조수집에 적응하고 내재해성을 갖는 쪽으로 서서히 진전되어 왔다. 시대경과에 따라 조도, 유망종, 유수색종, 내탈립종, 내풍성종, 내비성종의 분화와 이들의 정유율증대가 이루어져 왔음으로 알 수 있다.

• 한국약용작물학회지
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• 제27권4호
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• pp.271-277
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• 2019

Background: Rehmannia glutinosa (Gaertn.) Libosch. ex Steud. has long been used as a traditional medicinal plant in Korea. This study was carried out to investigate the emergence conditions during the seedling periods in R. glutinosa. Methods and Results: The rhizomes of R. glutinosa variety (Jihwang 1) were harvested in the 22, March, 2018. The rhizomes were sown on in 50-cell plug trays. The emergence rates of seedlings at $15^{\circ}C$, $20^{\circ}C$, $25-40^{\circ}C$, and $45^{\circ}C$ treatment seedling were 1.3%, 96%, 100% and 0%, respectively. Rhizome rot was occurred at the temperature of $15^{\circ}C$ and $45^{\circ}C$. The emergence rates of seedlings in high moisture (HM), moderate moisture (MM) and low moisture (LM) treatments at $35^{\circ}C$ were 99.3%, 100%, and 0%, respectively. Drought damage was recorded in plant with the LM treatment. Seedling quality surveys were carried out at 10-days intervals from 10 to 60 days after sowing (DAS). Leaf length and leaf width were increasing until 50 DAS and the number of leaves was increasing until 60 DAS. Root length was increasing until 40 DAS, and then, flowering occurred from 30 to 60 DAS. Lastly, at 40 DAS, leaf aging and root enlargement was observed. Conclusions: We concluded that the emergence of seedlings was possible in the range of 20 to $40^{\circ}C$. Considering drying and rotting damage, we concluded that the moderate level of moisture is most appropriate for seedling emergence. In addition, we concluded that optimal seedling periods are between 30 and 40 DAS.

• 한국수자원학회논문집
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• 제47권12호
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• pp.1199-1212
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• 2014

본 연구에서는 댐 저수용량에 대한 이변량 빈도해석을 수행함으로써 재현기간 개념을 이용한 댐의 용수공급능력 평가방법을 제안하였다. 제안된 방법은 대청댐에 적용되어 검토되었다. 추가적으로 국내의 대표적인 가뭄사상에 대한 대청댐의 재현기간을 산정하고, 그결과를검토하였다. 그 결과를 정리하면 다음과 같다. 먼저, 본 연구에서는 이변량 빈도해석을 수행하기 위해 한국의 기후 특성을 반영한 댐의 용수공급능력 평가인자를 고려하였으며 5월 저류량 및 6~10월의 저류량 차이를 대상 변량으로 결정하였다. 둘째, 재현기간의 개념을 이용하여 대청댐의 용수공급능력을 평가한 결과, 대청댐은 재현기간 20년 미만에 대한 용수공급능력을 확보하는 것으로 나타났다. 마지막으로, 본 연구에서 제안된 방법은 한반도에 발생했던 대표적인 가뭄사상들을 분석하고, 해당 사상들에 대한 재현기간을 산정하는데 있어서도 유효함을 확인하였다.

• 식물병연구
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• 제8권1호
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• pp.1-10
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• 2002

2001년 기상의 특징은 3월부터 5월까지 계속된 극심한 가뭄과 생육기간 내내 계속된 고온현상 그리고 별다른 태풍의 내습 없이 9, 10월 수확기 맑은날의 지속으로 요약할 수 있다. 벼는 순조로운 기상 때문에 잎, 이삭도열병, 세균성벼알마름병, 흰잎마름병, 잎집무늬마름병의 발생이 예년에 비해 경미하였으나, 감비추진 정책에 의해 생육후기 깨씨무늬병이 발생하여 전국적으로 문제시되었으며 그동안 발생이 적었던 줄무늬잎마름병이 경기, 충청, 호남 서해안지역을 중심으로 많이 발생하였다. 고추는 생육기 비가 많이 왔던 전남북 지역에서 역병 발생이 심하였으며 토마토와 오이는 대부분 예년에 비해 병발생이 적었다. 수박의 경우는 꽃자리 부분이 썩는 푸른곰팡이병이 전국적으로 발생하였으며 CGMMV는 전년에 비해 상당폭 발생면적이 감소하였고 노지재배의 경우 탄저병 발생이 예년에 비해 심하였다. 참외와 딸기도 전년에 비하여 병발생이 경미하였으며 예년에 발생이 많았던 참외의 급성위조증상도 발생이 대폭 감소하였다. 마늘·양파의 흑색썩음균핵병은 봄철의 가뭄과 고온현상으로 병발생의 전년의 절반수준으로 감소하였다. 감자의 풋마름병은 발병포장이 증가하는 경향이었으며 고구마의 덩굴쪼김병도 발생이 감소하였다. 사과의 경우 전반적으로 병 발생이 예년에 비해 경미하였으며 배는 흰가루병이 많이 발생하였다. 맥류의 붉은곰팡이병은 예년처럼 거기 발생이 없었다.

• 지질공학
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• 제28권4호
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• pp.541-552
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• 2018

지속적 가뭄 발생에 따라 물공급의 사각지대인 유역 상류부 가뭄 대책 마련에 대한 수요가 급증하는 추세이며, 하천 및 상수도와 연계된 시스템 구축이 필요한 시점이다. 또한 하천의 건천화 방지와 적정 하천 유지유량 확보를 위한 시설 설치가 필요하나, 하천의 환경 및 생태계 보전 등의 이유로 지상 댐의 건설이 어려운 실정이다. 본 연구에서는 이에 대한 대안으로 아프리카 건조지역에서 많이 활용되는 샌드댐의 효과를 살펴보기 위한 타당성 평가를 수행하였다. 미계측 유역의 계곡수 유출량을 산정하기 위해 한국형 유역수문모형 SWAT-K를 이용하였으며, 모의 유출량을 저수지 추적기법과 연계하여 샌드댐의 저류량을 평가하였다. 기존하상을 이용하는 샌드댐과 준설형 샌드댐의 2가지 경우에 대해 취수시 저류량 변화와 하류 유량의 증감을 분석한 결과 샌드댐은 평시 하류 유량을 증대시키는 효과와 가뭄시의 취수를 통한 물공급 대응이 가능한 시설이라는 것을 정량적으로 확인할 수 있었다.

• 한국농공학회지
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• 제28권2호
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• pp.31-41
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• 1986

Knowledge of the degree of yield reduction due to water stress at different crop growth stages in rice production is important for rational scheduling of irrigation during periods of insufficient water supply. Previous studies to determine the degree of yield reduction duo to water stress suffered from interruptions by rain during experiment. Also the findings did rot relate the degree of water stress to the soil water potential and water deficit status of rice plants. In this study, two years experiments were conducted using the high yielding rice varieties, an Indica x Japonica (Nampoong) and a Japonica variety(Choochung). These were grown in 1/200$^{\circ}$ plastic pots placed under a rainfall autosensing, sliding clear plastic roof facility to control rainfall interruptions. The results obtained were as follows. 1.The two varieties differed in the growth stage most sensitive to water stress as well as the degree of yield reductions. When rice plants were stressed to the leaf rolling score 4 and soil water potential of about - 20 bar at major crop growth stages which included heading, booting, non-effective tillering, panicle initiation and early tillering stages, the yield reductions in the Indica x Japonica variety were 58%, 34%, 27%, 22%, and 21%, respectively, whereas in the Japonica vairety they were 23%, 36%, 1%, 13% and 22%, respectively. This result show that the recommended drainage during non-effective tillering is valid only for the Japonica variety. Sufficient irrigation at booting, heading and early tillering stages are necessary for both varieties. 2.The two varieties showed visible wilting symptoms when the soil water potential dropped to about - 3.0 bar. The Japonica variety showed more leaf rolling than the Indica X Japonica. However, it had a higher retention of leaf water content and greater stomatal diffusive resistance. When the soil water potential dropped, the Japonica variety showed leaf rolling score (LRS) 1 at 0 soil-5. 0 bar and LRS 2 at 0 soil -6.0 bar while the Indica X Japonica showed LRS 1 at 0 soil - 5.5 bar and LRS 2at 0 Soil - 9.0 bar. The stomatal diffusive resistance was maximum at the second top leaf blade in both varieties at intermediate water stress of 0 soil - 4.5 bar. 3.The number of days that was required for the soil water potential to drop to-3. 0 bar and to - 20.0 bar after drainage of irrigation water from the 20cm deep silty clay loam soil in the pots were 6 and 13 days, respectively for booting stage, and 7 and 11 days, respectively for heading stage, 9 and 12 days, respectively for panicle initiation stage, and 12 and 19 days, respectively for early tillering stage. 4.Water stress during the early tillering stage recorded the longest delay in beading time, the largest reduction in panicle numbers and a substantial yield decrease of 20%. This calls for better water management to ensure the availability of water at this stage, particularly during drought periods. In addition, a reexamination of the conventional inter-drainage practice during the non-effective tillering stage is necessary for the high yielding Indica X Japonica varieties.

• 한국산학기술학회논문지
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• 제19권4호
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• pp.633-641
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• 2018

최근 들어 홍수와 가뭄과 같은 자연 재해의 위험이 증가하고 있다. 이러한 위험을 저감하기 위하여 신뢰할 수 있는 수문자료는 수자원 분석 및 수공구조물 설계에 있어 매우 중요하다. 한국의 중부에 위치한 용담 구량천 유역은 K-water와 UNESCO IHP의 연구유역으로써 신뢰 할 수 있는 강수량, 유출량, 증발산량 등의 수문자료를 제공하고 있다. 본 연구는 실측된 수문자료를 바탕으로 우리나라의 산지 유역의 유출 특성을 분석하기 위하여 용담 구량천 유역에서의 유출특성을 Probability Distributed Model을 적용하여 분석하였다. 분석 결과, 유역 유축을 홍수기(6월-9월), 평수기(10-5월)로 기간 분리하여 분석하는 것이 필요함을 확인하였다. 유역 유출비가 홍수기에는 0.27~0.41, 평수기에는 0.30~0.45의 분포를 나타내고 있다. Probability Distributed Model은 적용기간에 따라 차별화된 검정 매개변수를 제시하고 있다. 또한, 2015년 평수기를 제외하고 다른 기간은 유역의 유출을 모두 적합(Nash Surcliffe Efficiency >0.7)하게 모의하고 있어 모형의 적용성을 확인하였다. 본 연구는 Probability Distributed Model을 활용한 기간분리를 통한 소규모 산지 유역의 유출특성방법을 제시한다.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2010년도 학술발표회
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• pp.273-277
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• 2010

This research was performed to examine changes in the timing of the growth of crops along with changes in temperatures due tochanges and to analyze the change of water-supply-reliability by adding an analysis of the change of agricultural water supply patterns in the basin area of Miryang dam in Korea. Had-CM3 model from U.K. was the tool adopted for the GCM model, a stochastic, daily-meteorology-generation-model called LARS-WG was alsoused for downscaling and for the climate change scenario (A1B) which represents Korea's circumstances best. First of all, to calculate changes in the timing of the growth of crops during this period, the theory of GDD was applied. Except for the period of transplanting and irrigation, there was no choice but to find the proper accumulated temperature by comparing actual temperature data and the supply pattern of agricultural use due to limited temperature data. As a result, proper temperatures were found for each period. $400^{\circ}C$ for the preparation period of a nursery bed, $704^{\circ}C$ for a nursery bed's period, $1,295^{\circ}C$ for the rice-transplanting period, $1,744^{\circ}C$ for starting irrigation, and $3,972^{\circ}C$ for finishing irrigation. To analyze future agricultural supply patter changes, the A1B scenario of Had-CM3 model was adopted, and then Downscaling was conducted adopting LARS-WG. To conduct a stochastical analysis of LARS-WG, climate scenarios were generated for the periods 2011~2030, 2046~2065, 2080~2099 using the data of precipitation andMax/Min temperatures collected from the Miryang gauging station. Upon reviewing the result of the analysis of accumulated temperatures from 2011~2030, the supply of agricultural water was 10 days earlier, and in the next periods-2046~2065, 2080~2099 it also was 10 days earlier. With these results, it is assumed that the supply of agricultural water should be about 1 month ahead of the existing schedule to meet the proper growth conditions of crops. From the results of the agricultural water supply patterns should be altered, but the reliability of water supply becomes more favorable, which is caused from the high precipitation change. Furthermore, since the unique characteristics of precipitation in Korea, which has high precipitation in the summer, water-supply-reliability has a pattern that the precipitation in September could significantly affect the chances of drought the following winter and spring. It could be more risky to make changes to the constant supply pattern under these conditions due to the high uncertainty of future precipitation. Although, several researches have been conducted concerning climate changes, in the field of water-industry, those researches have been solely dependent on precipitation. Even so, with the high uncertainty of precipitation, it is difficult for it to be reflected in government policy. Therefore, research in the field of water-supply-patterns or evapotranspiration according to the temperature or other diverse effects, which has higher reliability on anticipation, could obtain more reliable results in the future and that could result in water-resource maintenance to be safer and a more advantageous environment.