• 제목/요약/키워드: micro-ecosystem

검색결과 67건 처리시간 0.053초

Micro-ecosystem(pot)중 제초제 quinclorac 토양잔류물의 행적 (Behaviour of the soil residues of the herbicide quinclorac in the micro-ecosystem (pot))

  • 안기창;경기성;이재구
    • 농약과학회지
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    • 제2권3호
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    • pp.96-106
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    • 1998
  • Micro-ecosystem (pot)중 quinclorac 토양잔류물의 행적을 구명하기 위하여 이화학적 특성이 상이하고 quinclorac의 신생 및 숙성 잔류물을 함유한 2종의 논토양에 42일간 벼를 재배하였다. 벼의 재배 유무와 무관하게 quinclorac 신생잔류물과 숙성 잔류물을 함유한 토양으로부터 방출된 $^{14}CO_{2}$의 양은 두 토양 모두에서 총처리 방사능의 2.2% 미만으로서 토앙 미생물에 의한 분해가 용이하지 않았음을 시사하였다. 서로 다른 quinclorac 토양잔류물을 함유한 두 토양에서 벼에 흡수 이행된 $^{14}C$의 양은 토양 A보다 유기물 함량과 점토의 함량이 적은 토양 B에서 더 많았고, quinclorac 잔류물의 흡수이행은 신생잔류물을 처리한 토양에서 보다 숙성 잔류물을 함유한 토양에서 적었다. 벼 수확 후 신생잔류물과 숙성잔류물을 함유한 토양 A에 잔류하는 $^{14}C$는 각각 총처리 방사능의 84.5와 86.3%로 비슷하였으며, 토양 B에서는 각각 61.8과 67.7%였다. 반면 벼를 재배하지 않은 토양중에서는 98.3%이상이 잔류하여 quinclorac이 화학적으로나 미생물적으로 비교적 안정한 화합물임을 입증하였다. Quinclorac의 추출불가 토양속박 잔류물은 토양 유기물에 강력하게 흡착 또는 결합되어 있고 대부분이 fulvic acid에 혼입되어 있었다.

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계류생태계 보전을 고려한 환경친화적 사방 전략(I) (Consideration on Environmentally Friendly Erosion Control Strategy for Conservation of Stream Valley Ecosystem (I))

  • 박재현
    • 한국환경복원기술학회지
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    • 제5권5호
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    • pp.67-75
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    • 2002
  • This study was carried out to introduce current status to discuss erosion control strategy for the conservation of stream valley ecosystem. To restore stream valley ecosystem, we should establish restoration plans to keep the original shape of stream. It is necessary to use environmentally sound materials with conservation of valley stability. Valley construction for erosion control works should be evaluated continuously based on concepts of conservation and development of stream valley ecology. It is categorized in point of the important of class of stream valley conservation ahead planning and constructure. We suggest that the development of stream valley construction needs to prevent mass movement of soil sediments. In addition, it is established the basal strategy to protect macro and micro aquatic organisms in stream valley ecosystem.

Characteristics of micro-plastics in stormwater sediment basin: Case study of J wetland

  • Jiyeol Im;Kyungik Gil
    • Membrane and Water Treatment
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    • 제14권4호
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    • pp.147-153
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    • 2023
  • Urbanization has been causing such new pollutants as micro-plastic, thus the environmental impact of new pollutants on ecosystem is rapidly increasing. When it comes to micro-plastic, a representative artificial trace pollutant, its risk has been increased at a much faster rate, however the depth study associated with stormwater sediment and wetland was relatively rare. In this research, soil samples from storm water sediment were analyzed for distribution characteristics of micro-plastics in the J wetland (registered as Ramsar wetland, May 2021 and a representative environmental site in South Korea). Analyzed soil samples found approximately 201 ± 93 particle/kg (based on unit weight, Total micro plastic particles / Total Sample weight) micro-plastics in the samples. When considering the total quantitative numbers in stormwater sediment in the entire area of the J wetland, over 15,000 micro-plastics were estimated to be contaminating such area. In addition, in terms of qualitative numbers, micro-plastics were contaminating the J wetland with 94.7 % ratio of styrofoam type (43.9%) and polyethylene type (50.8%). These research results can be used as base data sets for controlling micro-plastics in the J wetland.

한국의 혁신 생태계: 진화 과정과 차세대 모델에 대한 탐색 (Innovation Ecosystem of Korea: Its Evolution Process and Exploring The Next Model)

  • 이정원;임채성
    • 기술혁신연구
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    • 제31권3호
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    • pp.1-37
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    • 2023
  • 한국 혁신 생태계는 후발 추격자에서 '민간 주도의 건강하고 역동적인 생태계 조성을 위한 정부의 역할이 중요한' 창조적 선도자 단계로 진화해 왔다. 한국의 혁신 생태계는 그동안의 획기적인 발전과 양적 확대에도 불구하고 혁신 성과의 정체 현상, 생태계 내 및 글로벌 연계 활동의 부족 등을 보여주고 있다. 미래 지향적인 혁신 생태계 조성을 위한 차세대 혁신 생태계 모델이 요구되는 상황이다. 기존의 이론적 근거를 바탕으로 혁신 생태계의 바탕을 이루는 것이 기업간 네트워크라는 관점에서 차세대 혁신 생태계의 요소로 기업간 네트워크 외에, 기업 역량, 공공 연구기관, 민간 산업단체, 기술 인프라, 정책 주체를 바탕으로 5개 요소를 설정하고, 불연속적 기술 및 시장 변화에 부응하는 '민간 주도의 건강하고 역동적인' 혁신 생태계로서의 차세대 혁신 생태계 모델을 제시하였고 혁신 생태계구축 역할을 담당하는 정책 주체의 구체적인 방향을 제시하고, 본 연구의 의의를 제시하였다.

Six Unrecorded Species of Micro-moths (Lepidoptera) from Korea

  • Koo, Jun-Mo;Lee, Kang-Won;Kim, Jae-Dong;Cho, Soowon;Park, Kyu-Tek
    • Animal Systematics, Evolution and Diversity
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    • 제36권1호
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    • pp.35-40
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    • 2020
  • From a result of surveys on the biodiversity monitoring for moths in Korea, six species of micro-moths that were never known from Korea are reported here for the first time from this country. They are: Udea pseudocrocealis(South, 1901) of the family Crambidae, which has been known as endemic to Japan; Epinotia albiguttata (Oku, 1974) of the family Tortricidae, which was known belonging to Hikagehamakia Oku, 1974; and four species of the family Gelechiidae: Protoparachronistis concolor Omelko, 1986 and P. discedens Omelko, 1986, which were described from Primorisk, Russian Far East; Thiotricha pancratiastis Meyrick, 1921, which is known from Isl. Jejudo, and Thiotricha sp. which is being described in a separate paper. Here we provide images of adults and genitalia for the unrecorded species with a brief diagnosis.

Effect of micro-environment in ridge and southern slope on soil respiration in Quercus mongolica forest

  • Lee, Jae-Seok
    • Journal of Ecology and Environment
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    • 제42권4호
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    • pp.210-218
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    • 2018
  • Background: Soil respiration (Rs) is a major factor of the absorption and accumulation of carbon through photosynthesis in the ecosystem carbon cycle. This directly affects the amount of net ecosystem productivity, which affects the stability and sustainability of the ecosystem. Understanding the characteristics of Rs is indispensable to scientifically understand the carbon cycle of ecosystems. It is very important to study Rs characteristics through analysis of environmental factors closely related to Rs. Rs is affected by various environmental factors, such as temperature, precipitation, soil moisture, litter supply, organic matter content, dominant plant species, and soil disturbance. This study was conducted to analyze the effects of micro-topographical differences on Rs in forest vegetation by measuring the Rs on the ridge and southern slope sites of the broadly established Quercus mongolica forest in the central Korean area. Method: Rs, Ts, and soil moisture data were collected at the southern slope and ridge of the Q. mongolica forest in the Mt. Jeombong area in order to investigate the effects of topographical differences on Rs. Rs was collected by the closed chamber method, and data collection was performed from May 2011 to October 2013, except Winter seasons from November to April or May. For collecting the raw data of Rs in the field, acrylic collars were placed at the ridge and southern slope of the forest. The accumulated surface litter and the soil organic matter content (SOMC) were measured to a 5 cm depth. Based on these data, the Rs characteristics of the slope and ridge were analyzed. Results: Rs showed a distinct seasonal variation pattern in both the ridge and southern slope sites. In addition, Rs showed a distinct seasonal variation with high and low Ts changes. The average Rs measurements for the two sites, except for the Winter periods that were not measured, were $550.1\;mg\;CO_2m^{-2}h^{-1}$ at the ridge site and $289.4\;mg\;CO_2m^{-2}h^{-1}$ at the southern slope, a difference of 52.6%. There was no significant difference in the Rs difference between slopes except for the first half of 2013, and both sites showed a tendency to increase exponentially as Ts increased. In addition, although the correlation is low, the difference in Rs between sites tended to increase as Ts increased. SMC showed a large fluctuation at the southern slope site relative to the ridge site, as while it was very low in 2013, it was high in 2011 and 2012. The accumulated litter of the soil surface and the SOMC at the depth range of 0~5 cm were $874g\;m^{-2}$ and 23.3% at the ridge site, and $396g\;m^{-2}$ and 19.9% at the southern slope site. Conclusions: In this study, Rs was measured for the ridge and southern slope sites, which have two different results where the surface litter layer is disturbed by strong winds. The southern slope site shows that the litter layer formed in autumn due to strong winds almost disappeared, and while in the ridge site, it became thick due to the transfer of litter from the southern slope site. The mean Rs was about two times higher in the ridge site compared to that in the southern slope site. The Rs difference seems to be due to the difference in the amount of litter accumulated on the soil surface. As a result, the litter layer supplied to the soil surface is disturbed due to the micro-topographical difference, as the slope and the change of the community structure due to the plant season cause heterogeneity of the litter layer development, which in turn affects SMC and Rs. Therefore, it is necessary to introduce and understand these micro-topographical features and mechanisms when quantifying and analyzing the Rs of an ecosystem.

생태계보전부담금 반환사업의 복원기술 활용 경향과 방향 - 2014년부터 2020년까지 시행 사례를 중심으로 - (Trend and Development Direction of Restoration Technology Utilization in Ecosystem Conservation Charge Project - Focusing on Implementation Cases from 2014 to 2020 -)

  • 윤영관;이호우;구본학
    • 한국환경복원기술학회지
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    • 제26권5호
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    • pp.1-18
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    • 2023
  • The Ecosystem Conservation Levy (formerly known as the Ecosystem Conservation Cooperation Fund) system has been in place for 20 years, and it can be said that it has now entered the settlement stage. Based on an analysis of publicly available project implementation data from 2014 to 2020, we found that: 1) As the number of return projects increases, the targets of restoration technologies are also strengthening, and it is necessary to frame a series of processes from application, creation, and monitoring for some detailed projects to improve the effectiveness and efficiency of utilizing the levy. 2) Most of the implemented projects are applied as micro-ecosystem creation, but there are many cases where the contents of the project can be seen as other project categories. This shows that the purpose of the return project needs to be approached more clearly and suggests that institutional complementation is needed from the project application stage. 3) The detailed technologies applied tend to be gradually expanding, but most of them are technologies that are not differentiated from general development projects. It is urgent to secure a more technical identity, such as a range and list of utilized technologies suitable for the characteristics and purposes of return projects. 4) It is necessary to establish a relevant evaluation system or framework to utilize the monitoring results of restoration projects. 5) There have been few cases of application of single restoration technologies since the beginning, but the content and scope of the complexity tend to expand in recent years. Even if the objectives are not comprehensive and diverse, it can be seen that many parts of the projects are oriented toward convergence, so it is necessary to conduct separate research on this. 6) As for the direction of improvement of the return project, it is possible to consider expanding the restoration and conservation focus to partially accommodate the complexity of the natural environment and human ecology. It seems that the expansion of restoration technologies that consider the role and function of humans in the natural environment should be explored.

수중 환경 및 생태 실시간 모니터링을 위한 초소형 수중 음향통신 모뎀 개발 (Development of Underwater Acoustic Micro Modem for Real-Time Monitoring of Underwater Environment and Ecosystem)

  • 전준호;박성준
    • 전자공학회논문지CI
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    • 제48권6호
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    • pp.97-108
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    • 2011
  • 과거 유선 및 비실시간으로 구축되던 수중 생태 모니터링, 자원 탐사 시스템 등은 수중 무선 센서네트워크 시스템 기술의 연구 개발을 통해 실시간 정보 송수신이 가능한 디지털 융합의 형태로 진화될 수 있다. 이를 가능하게 하는 핵심 기술 중의 하나는 배터리에 의해 동작하는 초소형 수중 음향통신 모뎀 구현 기술이며, 본 연구에서는 무지향성 수중 음향 트랜스듀서를 탑재한 초소형 수중 음향통신 모뎀을 설계하고 개발한다. 또한, 구현된 수중 모뎀의 성능을 검증하기 위하여 경기도 양평의 북한강에서 송수신 실험을 수행하고 그 결과를 분석한다. 실험 결과에 따르면, 개발한 모뎀은 최대 250 m의 거리에서 200 bps의 전송속도와 $7.8{\times}10^{-5}$의 비트오율로 무선 데이터 송수신이 가능하였다. 개발된 수중 모뎀은 향후 수중 무선 센서네트워크를 활용한 다양한 응용 시스템에 적용 가능할 것으로 기대된다.