• 한국환경생태학회지
• /
• 제19권2호
• /
• pp.119-129
• /
• 2005

월악산국립공원의 현존식 생 및 녹지자연도와 조경수목 식재현황을 2004년에 조사하였다. 월악산국립공원의 현존식 생은 총 12개의 식물군락과 기타지역으로 구분되었으며, 신갈나무군락, 소나무군락, 낙엽활엽수림, 침활혼효림 등 자연림은 8개 군락으로, 일본잎갈나무림, 잣나무림 등 인공림은 3개 산림유형으로 구분되었다. 조사지역의 녹지자연도는 8등급 지역이 약$73.08\%$로 가장 넓게 분포하였고, 9등급 지역이 약$11.32\%$로 나타났다. 조사지역의 조경수목 식재현황은 총 44과 129종류가 확인되었으며, 이 중 약 $65.65\%$가 외래종이었다.

• Journal of Microbiology and Biotechnology
• /
• 제33권8호
• /
• pp.1013-1022
• /
• 2023

Arbuscular mycorrhizal fungi (AMF) are widespread soil endophytic fungi, forming mutualistic relationships with the vast majority of land plants. Biochar (BC) has been reported to improve soil fertility and promote plant growth. However, limited studies are available concerning the combined effects of AMF and BC on soil community structure and plant growth. In this work, a pot experiment was designed to investigate the effects of AMF and BC on the rhizosphere microbial community of Allium fistulosum L. Using Illumina high-throughput sequencing, we showed that inoculation of AMF and BC had a significant impact on soil microbial community composition, diversity, and versatility. Increases were observed in both plant growth (the plant height by 8.6%, shoot fresh weight by 12.1%) and root morphological traits (average diameter by 20.5%). The phylogenetic tree also showed differences in the fungal community composition in A. fistulosum. In addition, Linear discriminant analysis (LDA) effect size (LEfSe) analysis revealed that 16 biomarkers were detected in the control (CK) and AMF treatment, while only 3 were detected in the AMF + BC treatment. Molecular ecological network analysis showed that the AMF + BC treatment group had a more complex network of fungal communities, as evidenced by higher average connectivity. The functional composition spectrum showed significant differences in the functional distribution of soil microbial communities among different fungal genera. The structural equation model (SEM) confirmed that AMF could improve the microbial multifunctionality by regulating the rhizosphere fungal diversity and soil properties. Our findings provide new information on the effects of AMF and biochar on plants and soil microbial communities.

• The Plant Pathology Journal
• /
• 제38권3호
• /
• pp.203-211
• /
• 2022

Bacterial wilt, which is a major soil-borne disease with widespread occurrence, poses a severe danger in the field of tobacco production. However, there is very limited knowledge on bacterial wilt-induced microecological changes in the tobacco root system and on the interaction between Ralstonia solanacearum and fungal communities in the rhizosphere soil. Thus, in this study, changes in fungal communities in the rhizosphere soil of tobaccos with bacterial wilt were studied by 18S rRNA gene sequencing. The community composition of fungi in bacterial wilt-infected soil and healthy soil in two tobacco areas (Gengma and Boshang, Lincang City, Yunnan Province, China) was studied through the paired comparison method in July 2019. The results showed that there were significant differences in fungal community composition between the rhizosphere soil of diseased plants and healthy plants. The changes in the composition and diversity of fungal communities in the rhizosphere soil of tobaccos are vital characteristics of tobaccos with bacterial wilt, and the imbalance in the rhizosphere microecosystem of tobacco plants may further aggravate the disease.

• 한국환경과학회지
• /
• 제14권3호
• /
• pp.279-288
• /
• 2005

수도권내 9개 골프장 연못에서 조사된 관속식물은 코리아 CC(Korea CC)에서 95종으로 가장 많은 종이 분포하고 있으며, 은화삼 CC(Eunhwasam CC)에서는 가장 적은 21종류가 조사되었다. 조사된 관속식물은 대체적으로 1-2년생의 단자엽식물과 다년생의 쌍자엽식물로 구성되어 있다. 연못식생의 외래식물과 식재식물의 비율은 지산 CC(Jisan CC)가 $52.3\%$의 비율을 보여 많은 식물들이 외래식물과 식재식물로 구성되어 있으며, 파인크리크 CC(Pine Creek CC)는 $21.1\%$로서 가장 낮은 비율을 보였다. 9개 골프장 중에서 식물군락이 가장 다양한 곳은 파인크리크 CC(Pine Creek CC)로서 총 21개 군락이 조사되었으며, 반자연식생 및 자연식생군락이 16개, 식재 또는 외래식물군락이 9개 군락으로 조사되었다. 전체 연못의 반자연식생 및 자연식생 식물군락 중 수생식물군락은 17개 군락으로 조사되었으며, 교란지식생 및 식재군락에서는 12개의 수생식물군락이 조사되었다 조사된 9개 골프장에서 파인크리크 CC(Pine Creek CC)가 자연식물군락이 대상식물군락 보다 많았으며, 프리스틴벨리 CC(Pristine Valley CC)는 반자연식생 및 자연식생이 조사되지 않았다. 연못식생의 자연성 평가에서는 마이다스벨리 CC(Midas Valley CC)와 파인크리크 CC(Pine Creek CC)가 평가지표에 따른 가치등급에서 놀은 자연성을 보였으나, 서서울 CC(Seseoul CC)와 은화삼 CC(Eunhwasam CC)는 가장 낮은 자연성을 보였다. 이들 자연성에 대한 유사성 거리계수의 상대거리에 의한 집단 분류에서는 인위적 식생이 우세한 태영 CC(Taeyoung CC), 은화삼 CC(Eunhwasam CC), 지산 CC(Jisan CC), 서서울 CC(Seseoul CC)가 하나의 군으로 구분되었으며, 반자연적 식생의 특징을 보인 코리아 CC(Korea CC)와 프리스틴벨리 CC(Pristine Valley CC)가 하나의 군으로 조사된 골프장에서 비교적 자연성이 놀은 마이다스벨리 CC(Midas Valley CC)와 파인크리크 CC(Pine Creek CC)가 하나의 군을 형성하고 있었다. 블루헤런 CC(Blue Heron CC)는 다른 군과는 또 다른 의미로서 구분되었는바, 블루헤런 CC(Blue Heron CC)는 경관적 의미에 대한 가치평가가 놀은 결과로서 하나의 군으로 나누어 졌다.

• The Plant Pathology Journal
• /
• 제21권2호
• /
• pp.93-98
• /
• 2005

Molecular ecological studies of microbial communities revealed that only tiny fraction of total microorganisms in nature have been identified and characterized, because the majority of them have not been cultivated. A concept, metagenome, represents the total microbial genome in natural ecosystem consisting of genomes from both culturable microorganisms and viable but non-culturable bacteria. The construction and screening of metagenomic libraries in culturable bacteria constitute a valuable resource for obtaining novel microbial genes and products. Several novel enzymes and antibiotics have been identified from the metagenomic approaches in many different microbial communities. Phenotypic analysis of the introduced unknown genes in culturable bacteria could be an important way for functional genomics of unculturable bacteria. However, estimation of the number of clones required to uncover the microbial diversity from various environments has been almost impossible due to the enormous microbial diversity and various microbial population structure. Massive construction of metagenomic libraries and development of high throughput screening technology should be necessary to obtain valuable microbial resources. This paper presents the recent progress in metagenomic studies including our results and potential of metagenomics in plant pathology and agriculture.

• Journal of Plant Biology
• /
• 제18권3호
• /
• pp.129-134
• /
• 1975

It was studied of relation between biomass of reed communities (Phragmitis communis) and several environmental factors concerned with such as chlor ine, pH, humus content in soil and depth of seawater submerged. Two sites where were the different geographical conditions were set up. One site had two plots: H plot, at theshallows of seawater, was not submerged except at full tide or at heavy rainfall, and M plot, at medium depth of seawater, submerged at every common tide at inside of a bank along the west seashore of Mu-An-peninsula. The other site also two plots: M' plot, at medium depth, submerged about 10 hours at each tide, and L plot, at deep seawater submerged every tims at tide at the outside of a bank along the eastside estuary of Youngsan river. Maximum standing crop of the reed community was shown on 25th of June: biomass at H M, M' and L plot were respectively 4.65, 3.60, 0.98, and 0.67 kg dry weight per $m^2$. Density of individual at H, M, M' and L plot was 67, 78, 244 and 333 plants per $m^2$. Net production of the terrestrial parts of rred community on the outside of the bank were lesser as much as a sixth than that on inside, but the density of the plant on outside of the bank was higher as much 4 or 5 times than that on inside. It was assumed that the growth of reed plant was inhibited by high chlorine, high pH, less humus in soil and submergence of seawater for long period.

• ALGAE
• /
• 제23권1호
• /
• pp.31-52
• /
• 2008

This study analyzes characteristics of phytoplankton communities around Wolseong nuclear power plant by selecting 16 stations from July 2006 to June 2007 and understands the influences on standing crops and chlorophyll a of phytoplankton by passing through the cooling water system. The total species number is 283, among which diatoms is 208 occupying 73.5% of total taxa. The mean of total standing crops is 469,380-3,704,114 cells L-1. It is the highest in April 2007 because blooming of Chaetoceros socialis occurs during this period. The mean standing crops of microplankton and nanoplankton are average 129,666-3,392,640 cells L-1 and 240,943-650,505 cells L-1 respectively, which occupy 54.01% and 46.54% of total standing crops. The mean concentrations of total chlorophyll a is 0.64-5.39 μg L-1. The mean concentrations of chlorophyll a of microplankton, nanoplankton and picoplankton are 1.33 μg L-1, 0.21 μg L-1 and 0.49 μg L-1 respectively. Dominant species around Wolseong neclear power plant during this study are Chaetoceros debilis, Chaetoceros socialis, Leptocylindrus danicus, Pseudo-nitzschia fraudulenta, P. subfraudulenta and Thalassiosira decipiens. Fluctuation rates of standing crops and chlorophyll a concentrations of phytoplankton passing through the cooling water system are 22.80% and 50.48% respectively. Decrease of standing crops and chlorophyll a concentrations of phytoplankton means that community structure of phytoplnakton may change at the discharge areas.

• Journal of Plant Biology
• /
• 제1권1호
• /
• pp.17-24
• /
• 1958

The author investigated the plant sociological studies on the flora of Inchon districts coast area. (It contains also province of Buchun, Kumpo, and Hwasung, the island of Kanghwa.) The scenery of the west coast in Korea is very curious, because the soil in this area contains comapratively large amount of mud and small sand. Some parts of this area is covered with only mud, and the area between the line of high tije and line of low tide is very vast. When a low tide was appearel, there were vast moddel places appeared about 10 km in length. The author could distinguish $\varepsilon$ different types of communties in this zone. (1) Suaeda jatonica community (2) Statice japonica community (3) Scirtus triqueier community (4) Zoy_ia community (5) Phragmites community (6) Carex Pumilla community (7) Atriolex subsodata community (8) Rosa rugasa community (1), (2), (3), (4) communities can grow under the high tide. (When the high tide comes they soaked in the sea water.) (1) Suaeda community is the most popular type of the Yellow sea. It is very wonderful scene that the vast area (the length of 10 km) is covered with this Suaeda, and it looks like to be painted with blood. (2) Staice (3) Scirpus (4) Zoysia community is can fully maintain their glorious life in the sea water. It is due to the this plants tolerance of salt. (1), (2), (3), (4) communities are very strong to the tolerance of salt, especially the Suaeda is remarkable. The structure and some sucession I trend of each community were studied in detail and the mutual relations among the communites were also concluded.

• Journal of Microbiology and Biotechnology
• /
• 제32권7호
• /
• pp.862-868
• /
• 2022

Microalgae are photosynthetic cyanobacteria and eukaryotic microorganisms, mainly living in the water. In agriculture, numerous studies have been conducted to utilize microalgae as a biostimulant resource. Scenedesmus has been known to be one such microalga that can promote plant growth by secretion of auxin or cytokinin hormone analogs. However, no research has been performed on the effect of microalgae treatment on plant microbiota communities. This study was conducted to investigate the mode of action of microalgae as biostimulants in a plant microbiota perspective by using Scenedesmus sp. CHK0059 (also known as species Chlorella fusca), which has been well documented as a biostimulant for strawberries. The strawberry cultivar Keumsil was bred with Seolhyang and Maehyang as the parent cultivars. Using these three cultivars, microbiota communities were evaluated for changes in structural composition according to the CHK0059 treatment. CHK0059-treated Seolhyang, and CHK0059-untreated Maehyang were similar in microbial diversity in the endosphere. From a microbiota community perspective, the diversity change showed that CHK0059 was affected by the characteristics of the host. Conversely, when CHK0059 treatment was applied, populations of Streptomyces and Actinospica were observed in the crown endosphere.

• 한국환경복원기술학회지
• /
• 제15권6호
• /
• pp.79-89
• /
• 2012

This study was compared to the differences in the habitat, species composition and community structure of revegetation and nature area in Korea. Plant number in plot of revegetation and nature area was 10.3 and 15.0 taxa, respectively, and coverage was 90.6 and 88.1%, respectively. Revegetation and nature area was very heterogeneous, due to low similarity index (0.38) and less common plants. Festuca arundinacea frequency (56.7%) was highest in revegetation area, and Oplismenus undulatifolius frequency (66.7%) was highest in nature area. Plant appearing of revegetation and nature area was 111 and 136 taxa, respectively. Herb appearing of revegetation and nature areas was 93 (83.3%) and 72 (52.9%) taxa, respectively, tree was 18 (16.2%) and 64 (47.1%) taxa, respectively. Plant communities of revegetation area was classified into Lespedeza bicolor, Indigofera amblyantha, Alnus sibirica, Festuca arundinacea, Eragrostis curvula, Miscanthus sinensis, Humulus japonicus, Setaria faberii, Rudbeckia bicolor, Pueraria lobata community. Plant communities of nature area was classified into Pinus densiflora, Quercus aliena, Quercus acutissima, Quercus variabilis, Quercus serrata, Castanea crenata, Pinus rigida, Robinia pseudoacacia, Populus tomentiglandulosa, Phyllostachys bambusoides community. Habitat, species composition and community structure of revegetation and nature area showed a large difference.