• Proceedings of the Plant Resources Society of Korea Conference
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• 2020.12a
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• pp.49-49
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• 2020

본 연구는 호랑버들과 갯버들 교잡종의 잎 형태적 특성을 국내 자생종인 호랑버들, 갯버들과 비교하였다. 호랑버들 35개체, 갯버들 35개체, 교잡종 100개체에서 잎을 채취하여 잎의 길이와 너비, 엽저와 엽두 각도, 잎자루 길이와 너비, 탁엽의 길이와 너비, 잎 두께 등 총 17개의 잎 형태적 특성을 분석한 결과, 엽두 각도와 탁엽의 길이를 제외한 15개의 특성에서 세 분류군이 유의한 차이를 나타내었다. 교잡종의 잎 길이와 너비의 비는 갯버들, 교잡종, 호랑버들 순으로 크게 나타나 교잡종의 잎의 형태는 피침형인 갯버들과 타원형인 호랑버들 사이 중간 형태로 나타났다. 교잡종의 잎의 너비, 엽저 각도, 잎자루의 길이와 너비, 탁엽의 길이와 너비는 호랑버들과 갯버들의 중간 형태를 나타내었으며, 탁엽의 거치 개수는 교잡종이 호랑버들과 갯버들보다 많은 특성이 나타났다. 잎 뒷면 단위면적당 털의 개수 또한 교잡종이 호랑버들과 갯버들보다 많은 특성을 나타냈다. 세 분류군 간 잎 형태적 차이를 구명하기 위해 유의한 차이를 보인 15개의 변수를 이용하여 주성분분석을 실시한 결과 고유값이 1 이상인 제 1, 2, 3, 4주성분이 전체 분산의 68.2%를 설명하였다. 제 1주성분은 잎의 너비, 잎의 1/3 아랫부분 너비, 잎의 1/3 윗부분 너비, 잎자루의 길이, 잎의 길이로 잎의 크기와 관련이 있는 특성들이 높은 상관관계를 나타내었고, 제 2주성분은 엽맥의 수, 잎자루의 너비와 높은 상관관계를 나타내었다. 제 3주성분은 탁엽의 거치 개수, 탁엽의 너비로 탁엽의 특성과 관련이 있는 특성들이 높은 상관관계를 나타내었으며, 제 4주성분은 잎의 두께와 높은 상관관계를 나타내었다. 주성분분석 결과 호랑버들과 갯버들 교잡종의 잎 특성은 호랑버들보다 갯버들과 가까운 것으로 나타났다. 잎의 형태적 특성으로 세 분류군을 구별하기 위해 정량형질을 이용한 판별분석 결과 교잡종 중 대부분(93.3%)이 호랑버들, 갯버들과 구별되었다. 일부 교잡종 개체(6.7%)가 갯버들로 오분류되었지만, 잎의 정성적 특성인 잎의 거치와 측맥의 특성을 고려한 결과 모든 개체가 교잡종으로 구분되었다. 따라서 호랑버들과 갯버들의 교잡종은 잎의 형태적 특성이 부모종인 호랑버들, 갯버들과 다른 독특한 형태를 가진 것으로 나타났다.

• Korean Journal of Ecology and Environment
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• v.47 no.4
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• pp.247-257
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• 2014

The construction of eight large weirs in the Nakdong River, Korea, caused a decrease in the water flow velocity and several physical changes to the water environment. Here, changes in phyto- and zooplankton communities and water quality in the areas near the eight weirs were investigated from 2011 to 2013, and relationships between phytoplankton abundances and environmental factors were analyzed. Special emphasis was given to the succession patterns in algal abundance based on temperature fluctuations. At the eight weirs, 24 dominant species were found. The most abundant phytoplankton species was Stephanodiscus sp. (39.4% of dominant frequency). Cyanobacteria of the genus Microcystis dominated during the summer, with an dominant frequency of 8.5% and cell abundance ratio of 36.6%. Significant correlations were observed between temperature and abundance of eight of the main dominant species; seven species showed positive correlations with temperature. Stephanodiscus sp., however, showed a negative correlation with temperature (r=-0.26, p<0.01). In addition, this species showed a significant negative correlation with the dominant algal species-Aulacoseira granulata and Aphanizomenon flos-aquae, with the zooplankton Copepoda and with Cladocera. On the contrary, seven other dominant species of algae showed significant positive correlations with zooplankton. Thus, we showed that the seasonal succession of plankton communities in the Nakdong River was related to the water temperature changes.

• Journal of Korean Society of Forest Science
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• v.98 no.4
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• pp.472-478
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• 2009

Pine (Pinus densiflora) forests of 58 sites on the ridge of the Baekdudaegan, South Korea were classified by applying the phytosociological method and TWINSPAN. The floristic composition and life-form characteristics of the vegetation types analyzed and documented. The vegetation types were classified into five groups including four groups of Carex humilis var nana type and one group of Abies koreana-Sasa borealis type. Compositae was the most diverse family (26 species), Liliaceae (21 species), Rosaceae (18 species) and Betulaceae (11 species) whereas 27 families were represented by only one species. Taxonomically, Compositae was the most diverse (17 genera), Liliaceae and Rosaceae(12 genera) whereas 41 families were represented by only one genus. The Fagaceae was the most important family in total coverage (19.0) and followed Pinaceae (16.7) and Ericaceae (15.1). Five families such as Compositae, Liliaceae, Rosaceae, Betulaceae, and Umbelliferae contributed little to total coverage, although represented by numerous species. In the correlation between species richness and life forms, the species richness was highly correlated with growth and disseminule forms. In general, the correlation coefficients between life forms represented lower values than those between species richness and life-forms.

• Journal of Animal Science and Technology
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• v.54 no.2
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• pp.83-87
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• 2012

The purpose of this study was to estimate genetic parameters for productive traits in swine. Productive traits were considered on average daily gain (ADG), body height (BH) and body length (BL). Genetic analysis was consisted of 18,668 heads for productive traits which were based on on-farm performance tested from May, 2007 to Apr, 2011. For estimating genetic parameters on productive traits, single best model was fitted after finding source of variance on fixed and random effects and estimated with a multiple trait animal model by using DF-REML (Derivative-Free Restricted Maximum Likelihood). The estimated heritabilities of Duroc, Berkshire, Landrace and Yorkshire 0.22-0.58 for the average daily gain, 0.34-0.41 for the body height and 0.4-0.52 for the body length, respectively. Phenotypic correlations of average daily gain with body height and body length for the four breeds were 0.42-0.48, 0.53-0.58, 0.34-0.46 and 0.47-0.56, respectively. Phenotypic correlations of body height with body length were 0.41, 0.57, 0.52, 0.59, respectively. The estimated genetic correlation coefficients of average daily gain with body height and body length estimated for the four breeds were 0.34-0.47, 0.70-0.75, 0.17-0.38 and 0.50-0.53, respectively. The estimated genetic correlation coefficients of body height with body length were 0.57, 0.69, 0.61 and 0.71, respectively.

• Korean Journal of Environmental Biology
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• v.18 no.2
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• pp.237-246
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• 2000

The equilibrium theory of island biogeography describes that the number of species on an island is determined by two factors, island area and distance from mainland acting through extinction and immigration rates. I was analysed the relationships between species number and island area, latitude, and maximum elevation for butterflies on 71 islands in the Korean Peninsula. Among Korean islands, island area ($r^2$=0.405, P< 0.005) and habitat diversity ($r^2$=0.341, P<0.005) were significantly correlated, but distance from mainland ($r^2$=0.018, P>0.05) and latitude ($r^2$=0.040, P>0.05) were weakly correlated. The present and earlier studies on the butterfly species richness in Korean islands demonstrate that the butterfly fauna is closely related to the ecological variables, i.e., area, composition of flora and maximum elevation. [Equilibrium theory, butterfly, island area, latitude, distance from mainland, elevation]

• Korean Journal of Environment and Ecology
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• v.25 no.3
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• pp.365-377
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• 2011

This study aims at classifying and interpreting on the second forest vegetation located in Mt. Duryun affiliated to the ecotone in southern part of Korea, and foreseeing vegetation change based on component species and dominant species on canopy. The second forest vegetation is classified into 3 community units as Quercus serrata-Quercus variabilis community, Dendropanax morbiferus-Quercus acuta community and Chamaecyparis obtusa plantation. This research is also expatiated on the relationship between the distribution of communities and the environmental conditions. Quercus serrata-Quercus variabilis community will be succession horizontally and gradually from the part where Quercus variabilis is dominated relatively at first to the other part in the community, according to the component species of deciduous broad-leaved forest in the warm-temperate zone and evergreen broad-leaved forest as Camellietea japonicae.

• Journal of the Korean Society of Marine Environment & Safety
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• v.21 no.5
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• pp.474-483
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• 2015

In order to understand the seasonal change of phytoplankton as well as the effect of water physico-chemical parameters, we investigated 18 stations in coastal areas of the East Sea in February, May, August and November in 2009. The taxa of phytoplankton observed in this study were classified as 37 Bacillariophyceae, 22 Dinophyceae, 1 Euglenophyceae, 3 Dictyophyceae and 1 Cryptophyceae. Phytoplankton abundance ranged from $1.2{\times}10^3cells/L$ to $246.6{\times}10^3cells/L$(with a mean value of $24.8{\times}10^3cells/L$), the highest biomass was observed in May. The dominant species were Leptocylindrus danicus, Chaetoceros affinis, Pseudo-nitzschia pungens, Thalassionema nitzschioides and etc. Pearson's correlation co-efficient between phytoplankton abundance and other water parameters showed the positive relationships with pH, DO, Secchi-disk depth, and SS, the negative relationships with $SiO_2-Si$. Seasonal patterns of phytoplankton dominant species were affected by the characteristics of water masses based on T-S diagram analysis. In particular, phytoplankton distributional patterns were related with water temperature in May and salinity in August, respectively. According to the result of MDS(Multi-dimensional scaling) using the phytoplankton abundance and species composition, the spatial distribution of phytoplankton were characterized with Ganwon(Group A) and Gyeongbuk(Group B) at the coastal areas of Jukbyeon or Uljin.

• Korean Journal of Environment and Ecology
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• v.13 no.4
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• pp.299-308
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• 2000

지리산국립공원의 명선봉(1.586m)에서 덕평봉(1.521m)에 이르는 아고산지대를 중심으로 분포하고 있는 한국특산종 구상나무의 생육현황과 구상나무가 분포하는 천연림의 군집구조를 정확히 파악하여 앞으로 구상나무 관리의 기초자료를 마련하고자 구상나무가 생육하고 있는 지역에 26개의 방형구(20m$\times$20m)를 설치하여 식생을 조사하였다 분석한 결과 조사대상지는 신갈나무-구상나무 군집이었다 수종간의 상관관계에서는 뽕잎피 나무와 철쭉 마가목과 산벚나무, 층층나무와 시닥나무 등의 종들간에는 높은 정의 상관관계가 인정되었고 신갈나무와 쇠물푸레나무 잣나무와 노린재나무 등의 수종들간에 높은 부의 상관관계가 인정되었다 본 조사지의종다양도는 1.0572-1.0931로 비교적 낮은 편이었다. 구상나무의 활력은 저조한 것으로 나타났으며 8.32%가 고사목이었다 구상나무의 생육현황표에 의한 점수 평균은 9.03이었다 구상나무의 생육현황표에 의한 점수는 해발고와 낙엽퇴의 두께와 정의 상관관계가 인정되었다.

• Journal of Animal Science and Technology
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• v.54 no.2
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• pp.89-94
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• 2012

The objective of this study was to estimate the genetic parameters and breeding value of swine using their economic traits. The traits considered were age at 90 kilograms body weight (D90 kg), backfat thickness (BF) and eye muscle area (EMA). Estimation of genetic parameters and breeding value from 18,668 heads considering the economic traits were based on farm performance data from May 2007 to April 2011. Estimation of genetic parameters based on economic traits revealed that the single best model was fitted after finding source of variance on fixed and random effects and estimated by a multiple trait model using DF-REML (Derivative-FREE Restricted Maximum Likelihood). In this study, the estimated heritabilities of Duroc, Berkshire, Landrace and Yorkshire were about 0.22-0.59 for the D90 kg, 0.47-0.62 for the BF and 0.23-0.37 for the EMA. Genetic correlation of D90 kg with BF and EMA of the four breeds were -0.01-0.24 and -0.35--0.23, respectively. Moreover, the genetic correlation of BF with EMA was -0.68--0.17. On the other hand, the phenotypic correlation of D90 kg with BF and EMA of the four breeds were about 0.01-0.11 and -0.37--0.21, respectively, while the phenotypic correlation of BF with EMA was -0.68--0.17. Results showed that the genetic trends of breeding value every year were decreasing for D90 kg, increasing for BF while for EMA inconsistent values were obtained.

• Korean journal of food and cookery science
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• v.21 no.4 s.88
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• pp.406-415
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• 2005

To evaluate the storage characteristics of Korean soups for the utilization of the Ready-Prepared Foodservice System, Yukkaejang(spicy beef and vegetable soup), Sagol-woogeojitang (bone soup with young cabbage), Kalbitang(beef short-ribs soup) and Seolleongtang(beef and bone soup) were prepared and their physico-chemical characteristics were investigated according to storage time and temperature$(4^{\circ}\;to\;20^{\circ}C)$ through analysis of pH, TBA values, Hunter color values, microbial counts, and sensory evaluation. No significant difference in pH was shown among the 4 kinds of soup while TBA values were significantly increased with storage time and temperature. Hunter color values(L, a and b values) of the Korean soups were significantly increased except Yukkaejang. In the sensory evaluation, appearance, color, flavor, taste, texture and overall acceptability of the soups decreased significantly with increasing storage time and temperature. Through correlation analysis between quality factors of treatments stored at $4^{\circ}$, the overall acceptability in Yukkaejang and Seolleongtang showed significant positive correlation with appearance, color, flavor and texture. The evaluated shelf-life of all four Korean soups was within 3 days at $10^{\circ}$, suggesting that Korean soups are applicable to ready-prepared foodservice system.