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제주큰오색딱다구리 Dendrocopos leucotos quelpartensis의 번식기 동안의 먹이선택
양성년(Sung-Nyeon Yang),김영호(Young-Ho Kim),오홍식(Hong-Shik Oh) 한국조류학회II 2009 한국조류학회지 Vol.16 No.1
본 연구는 제주도에 서식하는 제주큰오색딱다구리(Dendrocopos leucotos quelpartensis)의 번식기 동안의 먹이 선택의 특성을 밝히기 위하여 2008년 3월부터 6월까지 한라산 국립공원 관음사지구 입구 주변과 한라수목원 일대에서 이루어졌다. 연구결과, 제주큰오색딱다구리의 먹이 자원은 딱정벌레목(Coleoptera) 39.7%, 나비목(Lepidoptera) 41.1 %, 거미목(Araneae) 4.0%, 메뚜기목(Orthoptera) 0.3%, 곤충강에 속하는 미동정 종 13.1%, 기타 1.7%이었으며, 주로 딱정벌레목과 나비목을 채식하는 것으로 나타났다. 또한 암·수간의 먹이선호도에는 차이가 없는 것으로 나타났다. The purpose of this study is to investigating food resources of Jeju White-backed Woodpecker (Dendrocopos leucotos quelpartensis) in breeding season. For this purpose, Jeju White-backed Woodpecker was surveyed from March to June 2008 in study areas of Halla Arboretum and around Kwaneumsa in Mt. Halla National Park, Jeju Island. Food resources of Jeju White-backed Woodpecker were the beetle order (Coleoptera) 39.7%, the butterfly order (Lepidoptera) 41.1%, the spider order (Araneae) 4.0%, the grasshopper order (Orthoptera) 0.3%, unknown orders belonging to the insect class (Insecta) 13.1%, and the others 1.7%. Jeju White-backed Woodpeckers preyed mostly on the beetle order (Coleoptera) and the butterfly order (Lepidoptera). Also, there was no difference between male and female on food preference.
무 유기재배와 관행재배 토양의 화학성과 미생물 군집 비교
강호준,양성년,송관철,조영윤,김유경 한국유기농업학회 2019 韓國有機農業學會誌 Vol.27 No.4
This study was conducted to investigate the responses of soil properties and microbial communities to different agricultural management and soil types, including organic management in Andisols (Org-A), organic management in Non-andisols (Org-NA), conventional management in Andisols (Con-A) and conventional management in Non-andisols (Con-NA) by using a pyrosequencing approach of 16S rRNA gene amplicon in Radish farms of volcanic ash soil in Jeju island. The results showed that agricultural management systems had a little influence on the soil chemical properties but had significant influence on microbial communities. In addition, soil types had significant influences on both the soil chemical properties and microbial communities. Organic farming increased the microbial density of bacteria and biomass C compared to conventional farming, regardless of soil types. Additionally, Org-NA had the highest dehydrogenase activity among treatments, whereas no difference was found between Org-A, Con-A and Con-NA and had the highest species richness (Chao 1) and diversity (Phyrogenetic diversity). Particularly, Chao 1 and Phyrogenetic diversity were increased in organic plots by 12% and 20%, compared with conventional plots, respectively. Also, regardless of agricultural management and soil types, Proteobacteria was the most abundant bacterial phylum, accounting for 21.9-25.9% of the bacterial 16S rRNAs. The relative abundance of putative copiotroph such as Firmicutes was highest in Org-NA plot by 21.0%, as follows Con-NA (13.1%), Con-A (6.7%) and Org-A (5.1%.), respectively and those of putative oligotrophs such as Acidobacteria and Planctomycetes were higher in Con-A than those in the other plots. Furthermore, LEfSe indicated that organic system enhanced the abundance of Fumicutes, while conventional system increased the abundance of Acidobacteria, especially in Non-andisols. Correlation analysis showed that total organic carbon (TOC) and nutrient levels (e.g. available P and exchangeable K) were significantly correlated to the structure of the microbial community and microbial activity. Overall, our results showed that the continuous organic farming systems without chemical materials, as well as the soil types made by long-term environmental factors might influence on soil properties and increase microbial abundances and diversity.
광합성세균 Rhodopseudomonas palustis 분리 및 IAA와 Carotenoid 생성에 관한 연구
김유경,조영윤,강호준,김정선,양성년,좌창숙,Kim, Yu-Kyoung,Cho, Young-Yun,Kang, Ho-Jun,Kim, Jung-Sun,Yang, Sung-Nyun,Jwa, Chang-sook 한국유기농업학회 2017 韓國有機農業學會誌 Vol.25 No.4
본 연구에서는 제주도 한라산 중산간 습지대 28개소에서 IAA 및 carotenoid 생성능이 우수한 광합성 세균 1종을 최종 선발하였으며, 16S rRNA 염기서열 분석과 생리학적 특성을 조사한 결과 Rhodopseudomonas palustris JK-1 균주로 동정하였다. JK-1 균주의 최적배양조건을 선발하기 위하여 pH, 온도, 빛 및 통기 등을 포함한 여러 가지 요인들이 균주의 생장과 IAA 및 carotenoid 등 광합성색소 생성에 미치는 영향을 조사하였다. 시험결과 JK-1 균주는 명/혐기조건에서 균생장, IAA 및 광합성색소 생성이 양호하였으며 암/혐기조건에서 균생장, IAA 및 광합성색소 형성이 모두 크게 억제되었다. 명/혐기조건에서 균생장, IAA 및 carotenoid 등 광합성색소의 생산을 위한 최적 pH, 온도 및 배양회전속도는 각각 7, $30^{\circ}C$, 150 rpm, 9, $30^{\circ}C$ 및 150 rpm, 그리고 6, $25^{\circ}C$ 및 50 rpm이었다. 그리고 명/호기조건(0.5~1 vvm)에서는 명/혐기조건(0 vvm)보다 균생장 및 IAA 합성이 양호하였으나 광합성색소 형성은 크게 억제되었다. 따라서 최적배양조건은 명/혐기조건에서 pH 7, 온도 $30^{\circ}C$ 및 회전속도 100 rpm을 선발하였으며, IAA 합성을 유도한 배양액을 생육촉진 효과검증에 이용하였다. 시험결과 R. palustris JK-1 균주를 열무에 3% (v/v) 처리 시 지상부 및 지하부 건물중이 무처리 및 배지처리구 대비 각각 20~58% 및 40-28% 증가하였다. The JK-1 isolate which was the best producer of indole-3-acetic acid and carotenoid among the 388 strains isolated from 28 wetlands in Jeju, was identified to be Rhodopseudomonas palustirs belongs to a typical group of non sulfur purple bacteria based on 16S sRNA sequencing. This study investigated the effect of different cultural conditions of pH, temperature, agitation, light and aeration on growth, IAA and carotenoid production of photosynthetic bacterium JK-1 for optimization of IAA and carotenoid production. It was found that growth, IAA, carotenoid, and bacteriochlorophyll production with light (3,000~3,500 Lux) and agitation (100 rpm) showed better results than those with dark/static or dark/agitation (100 rpm) in anaerobic conditions. The optimal pH, temperature and agitation speed for cell growth were 7, $30^{\circ}C$, 150 rpm, for IAA production were 9, $30^{\circ}C$, 150rpm and for carotenoid production were 6, $25^{\circ}C$, 50 rpm, cultured for 72 h under anaerobic light, respectively. The growth and IAA production were high in aerobic culture compared with anaerocic culture, whereas carotenoid and bacteriochlorophyll content were decreased extremely in aerobic condition (0.5~1 vvm). Subsequently, the optimal culture conditions for JK-1 were selected with pH 7, $30^{\circ}C$ and 100 rpm under anaerobic light and the effect on plant growth was tested by pot assay. Inoculation of JK-1 with 3% (v/v) level caused increase in shoot and root dry weigh that varied from 20%~58% to 40%~28% in young radish in camparison to uninoculated treatment at 50 days of growth. The study suggests that the JK-1 isolate may serve as efficient biofertilizer inoculants to promote plant growth.