• Journal of Ecology and Environment
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• 제38권4호
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• pp.541-544
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• 2015

We report the status of wetland vascular plant species in Korea including the whole peninsula and its adjacent islands. This analysis was based on database from our previous categorized list. In all, 4,050 taxa have been reported, including 3,769 native and 281 naturalized. Of these, 479 taxa (12%) are considered as wetland vascular indicator species: 240 obligate wetland plants (OBW) and 239 facultative upland plants (FACW). Approximately 31% of those 479 taxa, i.e., 149 taxa, are labelled as aquatic macrophytes. Wetland plants, mostly herbaceous but some woody, inhabit aquatic bodies and wet meadows. Except for two OBW and six FACW taxa, the rest of the plants are summer-green only. The information provided here is valuable for making assessments of wetland ecosystem health, as well as for developing management plans to preserve and restore wetlands and their resident plant species while also creating artificial wetland environments.

• 생태와환경
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• 제43권1호
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• pp.24-34
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• 2010

This study was carried out to analyze some influences on ecological health conditions, threaten by various stressors such as physical, chemical and biological parameters. We collected samples in 2008 from three zones of upstream, midstream and downstream, Gap Stream. We applied multi-metric fish assessment index (MFAI), based on biotic integrity model to the three zones along with habitat evaluations based on Qualitative Habitat Evaluation Index (QHEI). We also examined fish fauna and compositions, and analyzed relations with MFAI values, QHEI values, and various guild types. Chemical parameters such as oragnic matter (BOD, COD), nutrients (TP, $NH_3$-N), coli-form number (as MPN), and suspended solids (SS) were analyzed to identify the relationship among multiple stressor effects. Using the sentinel species of Zacco platypus, the population structures and condition factors were analyzed along with DNA damages related with genotoxicant effects by comet assay. This study using all these parameters showed that stream condition was degraded along the longitudinal gradient from upstream to downstream, and the downstream, especially, was impacted by nutrient enrichment and toxicant exposure from the point source, wastewater treatment plant. Overall results indicated that our approaches applying various parameters may be used as a cause-effect technique in the stream health assessments and also used as a pre-warning tool for diagnosis of ecological degradation.

• 한국환경과학회지
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• 제32권12호
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• pp.861-881
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• 2023

This study investigated the flora of the Wang-ime oreum located on Seogwipo-si, Jeju-do, to basic data for the Jeju Island plant distribution. A total of 366 taxa were found with 94 families, 240 genera, 358 species, 1 subspecies, 6 varieties, and 1 forma. The floristic target species in Korea appeared as 2 taxa of grade V, 13 taxa of grade IV, 46 taxa of grade III, 5 taxa of grade II, and 49 taxa of grade I. There were 14 taxa for naturalized plants. The different plant life forms that appeared were large ground plants (M)(54 taxa), small land plants (N) (52 taxa), epiphyte (E) (6 taxa), indicator plants (Ch) (4 taxa), and semi-aquatic plants (H) (168 taxa), There were 34 and 48 taxa of plants(G) and annuals (Th) respectively. From these results, Wang-ime oreum, which is adjacent to ranches and grasslands, has little artificial interference, as more plants are distributed, and fewer naturalized plants are found than in Suwolbong and Dangsanbong. Accordingly, each oreum plays an important role in the flora of Jeju-do, thus a management plan tailored to the characteristics of the volcano is necessary.

• 환경정책연구
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• 제4권1호
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• pp.93-111
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• 2005

토양의 질(Soil Quality)에 대한 개념은 과거 식량생산을 위한 기반으로서의 토양에 대한 연구부터 1970년대 후반 Warkentin and fletcher(1977)에 의해 제안된 환경의 구성 요소로서의 토양에 대한 연구에 이르기까지 수많은 변화를 거쳐 왔다. 토양의 질에 대한 개념은 그 관점에 따라 다르지만 토양이 본래의 기능을 효과적으로 수행할 수 있는 용량으로 요약할 수 있다. 국제경제협력개발기구(OECD)에서도 토양의 질을 농업환경의 주요지표로 설정하여 토양유실과 토양탄소를 토양질 평가의 세부지표로 제시하였으며, 각 국가별로 활발한 연구가 수행 중에 있다. 본 논문에서는 현재까지 제안된 토양질의 주요 개념을 살펴보고 국내외의 토양질 평가체계를 비교 분석하고자 하였다. 토양질의 평가 체계는 최소자료군(Minimum Data Set)을 이용한 토양질 지표의 선정, 선별된 지표의 표준점수화함수(Standard Scoring Function), 각 지표의 통합을 통한 토양질의 점수화의 세 단계로 구분하여 분석하였다. 토양의 질 지표는 물리 화학 생물학적 지표로 분류할 수 있으며, 이 중 토양침식, 전용적밀도, 토심, 입단안정화도, 토성, 수분보유력, 유효수분함량은 물리적 질 지표로 주로 사용된다. 화학적 질 지표로는 유기물, pH, 전기전도도, 질소 인산 가리, 중금속 등이 있고, 생물학적 지표로는 미생물탄소 질소, 무기화 가능한 질소, 토양호흡이 주로 사용된다. 또한, 토양질 지표의 직접적인 측정이 어려운 경우에는 토양특성 환산식(Pedotransfer Function)을 이용하여 각 지표의 값을 추정할 수 있다. 현재 선진국에서는 SINDY를 비롯한 다양한 프로그램을 구축하고 있으며, 국내에서도 국가적인 차원의 자료구축을 통해 선별된 최소자료군의 계량화모델을 확립하여 웹기반의 프로그램을 구축해야 할 것이다. 현재까지 토양질의 계량화에 대한 연구는 주로 작물의 수량을 중심으로 이루어졌지만 향후 지속가능한 토양환경의 관리를 위해서는 환경의 질과 인간의 건강을 종합적으로 고려한 토양의 질 지표 개발에 대한 연구가 필요할 것이다.

• 한국생물공학회:학술대회논문집
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• 한국생물공학회 2003년도 생물공학의 동향(XII)
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• pp.361-362
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• 2003

본 실험은 생물비료인 인산가용화균 Penicillium sp. PS-113의 어독성과 주요작물에 대한 유해성을 조사하였다. 어독성 실험의 모든 시험구에서 무해한 것으로 판정되었고, 작물생육효과에서도 매우 뛰어난 효과가 있음을 확인할 수 있었다.

• Journal of Species Research
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• 제5권3호
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• pp.539-540
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• 2016

Microturbellarians, small free-living Platyhelminthes are rich in freshwater environments. They are useful as indicator of water quality. There has never been a record of microturbellarians in Korea. Here I report a microturbellarian species, Catenula confusa Nuttycombe, 1956. Although specimens in this study show some differences with those of the original description of C. confusa in length and width of zooid, they conform to the specific diagnosis of this species.

• Journal of Ecology and Environment
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• 제35권1호
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• pp.35-39
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• 2012

In the current study, several carabid beetle species were proposed as potential biological indicators for different habitat types (levee, upland dike, hillock, and streamside) of agricultural landscapes focusing on agrobiont species. Synuchus arcuaticollis and Synuchus orbicollis were found in all habitat types, indicating that they are general species for all habitat types. Harpalus eous and Synuchus cycloderus are potential bioindicator species for the paddy levee and hillock habitats, respectively. Amara pseudosimplicidens, Anisodactylus punctatipennis, and Chlaenius ocreatus, which occurred widely, and Bembidion morawitzi, which occurred only in the streamside habitat, are potential bioindicators for the streamside habitat.

• 상하수도학회지
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• 제21권3호
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• pp.279-285
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• 2007

Toxicity evaluations using oxygen uptake rate (OUR) on activated sludge process were investigated. On toxicity evaluations of heavy metals, all toxicants in experiments decreased OUR with respect to the concentrations of the toxicants, while high toxicities with cyanide and mercury were observed respectively. On toxicity evaluations of composite heavy metals, composite toxicities had similar results as to the total sum of each toxicants that presents accurate toxicity evaluation using OUR. From these results, it is concluded that activated sludge is effective indicator for toxicity evaluation on wastewater of biological treatment plants.

• ALGAE
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• 제22권2호
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• pp.69-85
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• 2007

From six reservoirs in Gyeonggi-do, we have collected the distribution and standing crop of phytoplankton since Nov. 2005 through Sep. 2006. As a result, the phytoplankton appeared totally 340 taxa belong to 7 classes, 15 orders, 5 suborders, 32 families, 4 subfamilies, 84 genera, 283 species, 43 varieties, 9 forms and 5 unidentified species. The standing crop was shown as minimum was 0.3 × 106 cells and maximum was 5,950 × 106. The relation of standing crop with TN, TP and Chl-a showed as positive. Total 12 taxa including 2 taxa of blue-green algae occurred to every seasons at six lakes, and it was thought that they distributed in mesotrophic state. Also, Achnanthes minutissima, Aulacoseira granulata, Eudorina elegans, Gloeocystis ampla, Pandorina morum, Pediastrum simplex var. duodenarium, Scenedesmus ecornis were regarded as the indicators of eutrophic state. From the estimation of LTSI and TSI, it was shown that the rest of lakes except for Idong reservoir of winter were eutrophic states.

• Current Optics and Photonics
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• 제7권1호
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• pp.65-72
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• 2023

The motion of organelles inside a cell is an important intrinsic indicator for assessing cell physiology and tissue viability. Dynamic contrast full-field optical coherence tomography (D-FFOCT) is a promising imaging technology that can visualize intracellular movements using the variance of temporal interference signals caused by biological motions. However, double-path interferometry in D-FFOCT can be highly vulnerable to surrounding noise, which may cause turbulence in the interference signals, contaminating the sample dynamics. Therefore, we propose a method for stabilized D-FFOCT imaging in noisy environments by using common-path interferometry in D-FFOCT. A comparative study shows that D-FFOCT with the proposed method achieves stable dynamic contrast imaging of a scattering phantom in motion that is over tenfold more noise-insensitive compared to the conventional one, and thus this imaging capability can provide cleaner motion contrast images. With the proposed approach, the intracellular dynamics of biological samples are imaged and monitored.