제주 생물권보전지역 내 한라산국립공원의 경관분석

강혜순,김현정,장은미 한국환경생태학회 2008 한국환경생태학회 학술대회지 Vol.2008 No.2

강원도 인삼재배지 농약 사용 실태

강혜순,박동식,황윤갑,김성문 한국농약과학회 2007 한국농약과학회 학술발표대회 논문집 Vol.- No.-

QuEChERS 전처리방법에 따른 고추장 중 252종 잔류농약 회수율 비교

강혜순,유일호,김진영,박기찬,고은주,최별,송영래 한국농약과학회 2015 한국농약과학회 학술발표대회 논문집 Vol.2015 No.4

Consequence of Floral Herbivory in Vicia cracca (Leguminosae)

강혜순,Gang, Hye-Sun The Korean Society for Integrative Biology 1998 Korean journal of biological sciences Vol.2 No.1

The effects of inflorescence herbivory and flowering time on plant architecture and reproductive yields were examined with a perennial herbacious species, Vicia cracca, occurring in Natick, Massachusetts, USA. Natural herbivory on inflorescences was observed among the total of 157 plants during a growing season. Vegetative and reproductive characters were measured in the field as well as in the lab depending on the characters. Approximately 64% of the plants were subjected to herbivory on inflorescences. Plants were classified into three groups; unbrowsed plants, partially browsed, and totally browsed plants, according to the level of herbivory on inflorescences of each plant. Plants were also categorized by their flowering time such as early vs late flowering plants. Herbivores tended to favor inflorescences on rather small plants, resulting in a pattern of totally contact or partially intact inflorescences on taller plants. The mean number of stems, which was assumed to be a direct result of severe herbivory in this population, differed among herbivory groups. There also was a tendency that plants flowering late in the season had more nodes with more leaves, suggesting that herbivory on stem tips early in the season before flowering might have induced growth of side branches or branchlets along the main stems. Comparison between unbrowsed and partially browsed plants showed that the latter compensated for browsing in terms of numbers of inflorescences, fruits, seeds and seed size (weight), though they did not compensate in flower number. The probability of fruit production (presence vs absence of fruits) and seed weight declined toward the end of the season. These results suggest that resources are deficient at the end of the season. Almost complete reproductive failure in totally browsed plants is attributed to the destruction of inflorescence display and the disadvantage of small vegetative size of those plants. After all, in this population, a moderate level of herbivory on inflorescences did not reduce the maternal fitness of the plants. However, severe herbivory on inflorescences resulted in antagonistic interactions between plants and herbivores.

GC-MS/MS를 이용한 농산물 중 Dichlofluanid 분석법 연구

강혜순,김혜경,김정환 한국농약과학회 2021 한국농약과학회 학술발표대회 논문집 Vol.2021 No.11

국립농산물품질관리원은 국내 및 수출농산물에 대한 안전관리를 위해 잔류농약 분석시 다성분 동시분석법을 이용하고 있으나, 일부 농약의 경우 정량을 위해 단성분 분석법을 사용하고 있다. 수출농산물 안전관리를 위해 분석하는 dichlofluanid도 그 중 한 성분으로서 단성분 분석법 특성상 추출 및 정제과정에 많은 시간과 인력이 요구되어 신속하고 정확한 농산물 안전관리를 위해 분석법 연구가 필요한 실정이다. 이에 본 연구에서는 dichlofluanid에 대한 분석법 연구를 수행하였다. 회수율 시험을 위해 감귤, 고추, 현미에 dichlofluanid를 0.01, 0.05 및 0.1mg/kg 수준으로 각각 주가하여 QuEChERS법으로 추출한 후 GC-MS/MS로 분석하였다. 각 농산물에 대한 회수율 분석 결과, 감귤의 경우 각각 73.3, 87.2, 84.8%, 고추의 경우 각각 110.7, 96.9, 94.1% 회수율을 보였으나, 현미는 고추 및 감귤과 다르게 0%의 회수율을 나타냈다. Dichlofluanid는 물리적 특성상 염기성 매질에서 단시간 내에 분해되는데, 현미의 경우 습윤화를 위해 정제수를 가했을 때 용액의 pH 가 7정도로서, 주가 된 dichlofluanid가 분해되어 회수되지 않은 것으로 판단된다. 이에 따라 추출과정 중 용액의 pH를 4이하로 유지하고자 현미에 1% formic acid 함유 정제수를 가하여 습윤화 한 후 1% formic acid 함유 acetonitrile로 추출하였다. 추출 시 수분제거 및 분배를 위해 MgSO₄(4g), NaCl(1g) 혼합물을 사용하였다. 전처리 후 GC-MS/MS로 분석한 결과, 회수율은 3가지 수준에서 각각 101.0, 100.9, 93.0%를 나타냈으며, 정량한계는 0.008mg/kg이었다. 본 연구결과, 감귤과 고추 중 dichlofluanid는 QuEChERS 전처리법과 GC-MS/MS로 분석이 가능하였다. 현미 중 dichlofluanid는 추출과정 중 용액의 pH 조절을 통한 변형된 QuEChERS 전처리법과 GC-MS/MS로 분석이 가능하였다. Dichlofluanid의 안정성은 매질의 pH에 따라 영향을 받으므로 현미와 같이 전처리과정 중 pH가 높은 농산물은 분석방법 개선이 필요하다고 사료된다.

Sex ratios and spatial structure of the dioecious tree Torreya nucifera in Jeju Island, Korea

강혜순,신수경 한국생태학회 2012 Journal of Ecology and Environment Vol.35 No.2

The sex ratio and spatial structure of different sexes are major components that affect the reproductive success and population persistence of dioecious plants. The differential reproductive costs between male and female plants are often believed to cause a biased sex ratio and spatial segregation of the sexes through slower growth and/or lower female survivorship. In this study, we examined the sex ratio and spatial structure of one population of Torreya nucifera trees in Jeju Island, Korea. We also tested the effects of the current tending actions in relation to tree vitality. At the population level, the sex ratio of the 2,861 trees was significantly biased toward males; however, it also showed considerable variation among different diameter at breast height classes and across habitats according to terrain level (from upper to lower). In 1999, before tree management (tending) began, among the ecological traits examined, only climber coverage correlated with tree vitality. Intensive tending such as climber removal since 1999 clearly enhanced the vitality of the majority of trees, but its effects were more conspicuous in medium-sized trees than in small ones, in upper terrain trees than those in other terrains, and in females than in males. Both male tree domination in small and large trees and tending effects on females are likely to reflect the effects of female reproductive costs regarding growth and/or survivorship. Spatial segregation between males and females was not observed in T. nucifera. Habitat heterogeneity created by the forest’s rocky ground and its implications regarding sex ratios and spatial structure require further studies. The sex ratio and spatial structure of different sexes are major components that affect the reproductive success and population persistence of dioecious plants. The differential reproductive costs between male and female plants are often believed to cause a biased sex ratio and spatial segregation of the sexes through slower growth and/or lower female survivorship. In this study, we examined the sex ratio and spatial structure of one population of Torreya nucifera trees in Jeju Island, Korea. We also tested the effects of the current tending actions in relation to tree vitality. At the population level, the sex ratio of the 2,861 trees was significantly biased toward males; however, it also showed considerable variation among different diameter at breast height classes and across habitats according to terrain level (from upper to lower). In 1999, before tree management (tending) began, among the ecological traits examined, only climber coverage correlated with tree vitality. Intensive tending such as climber removal since 1999 clearly enhanced the vitality of the majority of trees, but its effects were more conspicuous in medium-sized trees than in small ones, in upper terrain trees than those in other terrains, and in females than in males. Both male tree domination in small and large trees and tending effects on females are likely to reflect the effects of female reproductive costs regarding growth and/or survivorship. Spatial segregation between males and females was not observed in T. nucifera. Habitat heterogeneity created by the forest’s rocky ground and its implications regarding sex ratios and spatial structure require further studies.

Ecological Correlates of the Seasons in the Korean Angiosperms

강혜순,장선영 한국생태학회 2006 Journal of Ecology and Environment Vol.29 No.4

Ecological correlates of lowering times often are examined to infer evolutionary mechanisms forpollination modes with flowering times among 3,037 Korean angiosperms experiencing strong climaticseasonalities. We first examined taxonomic membership effects on flowering times across diverse taxonomiclevels. Phylogeny constrained flowering times at all levels down to the genus level. We then analyzed the fectsof ecological characteristics using subset data consisting of species randomly selected from each genus tocontrol phylogenetic effects. The commonly observed patterns of early flowering of woody species in temperateregions existed. Spring flowering shrubs and trees, however, both being wody, were involved with biotic andgrowing season than perennials although both herbs tended to be associated with abiotic vectors when floweringin autumn. These results support our hypothesis that species able to decouple vegetative and reproductivegrowth flower in springs dry season, but species with different habits, even when they flower within the sameseason, are subjected to different selective pressures for efficient pollination.

How Do Gestures and Facial Cues Affect EFL Listening Comprehension?

강혜순 한국응용언어학회 2006 응용 언어학 Vol.22 No.2

This study investigates the effect of gestures and facial cues on EFL listening comprehension while listening to a lecture in English. Many previous studies have emphasized the importance of visual information on listening comprehension and this study tries to show the effect of different types of listening input. The same lecture was given to three groups of low to high L2 learners of English in different styles; audio-only, audio-facial expression and audio-facial cues-gestures. To categorize each gesture and body movement the clarification system of McNeill (1992) was used. It delineates different types of hand movements (iconics, metaphorics, deictics, and beats) to explain the role of gestures. According to this study, types of listening input affected significantly the results of listening comprehension tasks. For participants of both a higher proficiency level and a lower proficiency level, more visual information such as gestures and facial expressions induces better understanding of listening materials. Also, there is a significant difference between these two groups in using a variety of direct and indirect learning strategies in the listening comprehension process. Proper instruction of listening strategies seems to be needed to improve the listening comprehension of EFL learners of a lower proficiency level.

두 외래종 민들레 번식 특성의 계절적 변이

강혜순,최유미 한국생태학회 1998 Journal of Ecology and Environment Vol.21 No.5

Ecological success of introduced species is frequently attributed to the reproductive characters of those species. We examined the relationship between both flowering season and plant size and reproductive characters in two introduced species of Taraxacum, e.g., T. officinale and T.laevigatum. Seventy six plants of T. officinale and 23 plants of T. laevigatum were randomly tagged from a population at the sungshin Women's University in April of 1997. The size and number of vegetative characters such as rosette diameter, leaf number, and the largest leaf length and width were measured for each plant at the onset of flowering. The infructescence was collected continually from each plant before seed dispersal from April to August of 1997. The number of infructescence per plant, and seed number and total seed weight per infructescence were measured. Mean individual seed weight per infructescence was also obtained. T. officinale possessed larger sized, but smaller number of, leaves than T. laevigatum, thereby resulting in no significant difference in total leaf area. There was a trend that vegetatively larger plants in both of these species produced reproductive characters larger in size or greater in number, except for seed number and total seed weight per infructescence in T. laevigatum. All reproductive characters examined in T. officinale decreased toward the end of flowering season. In T. laevigatum, infructescence number per plant also declined during a flowering season: however, mean seed number per infructescence increaed toward the end of flowering season with no significant seasonal change in the total seed weight per infructescence. T. officinale produced on average about twice as many seeds per plant as T. laevigatum during a growing season. These two Taraxacum species produced quite small seeds in size compared to the endemic species, exhibiting a far better dispersal ability of introduced species. These data demonstrate that most reproductive characters decline in size and number in both species during a long flowering period, but the two species appear to employ different strategies to achieve reproductive success in disturbed habitats.

강원도 고랭지 파세리재배지 토양 중 농약 잔류량 분석

강혜순,유일호,김진영,임현식,박기찬,고은주,윤석주,최상하 한국농약과학회 2014 한국농약과학회 학술발표대회 논문집 Vol.2014 No.10