• Title/Summary/Keyword: 생태 환경

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Ecological Niche Breadth of Q. mongolica and Overlap with Q. acutissima and Q. variabilis along with Three Environment Gradients (세 가지 환경구배에 따른 신갈나무의 생태적 지위폭과 상수리나무, 굴참나무와의 생태적 중복역)

  • Lee, Ho-Jong;You, Young-Han
    • Korean Journal of Environmental Biology
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    • v.27 no.2
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    • pp.191-197
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    • 2009
  • In order to characterize the ecological traits of Q. mongolica, we treated the seedlings of this species with three environmental factors, light, moisture and nutrient gradients from March to October 2007, and measured morphological and ecological 17 characters. Lastly calculated ecological niche breadth and niche overlap between Q. mongolica-Q. acutissima and Q. mongolica-Q. variabilis, and analysed them with a special reference to ecological distribution pattern and their competition relationship in Korea. The ecological niche breadth of Q. mongolica showed the lowest in nutrient treatment, but the highest in soil moisture treatment. The ecological niche value under light was intermediate. On comparison of the ecological niche breadth of three oak species, Q. mongolica showed the highest in light environment, which might be a reason for the dominant distribution in the forest plant community, Korea. The ecological niche overlap of Q. mongolica-Q. acutissima and Q. mongolica-Q. varabilis was the widest in moisture treatment, but the narrowest in nutrient treatment and the intermediate in light one. These results means that these three oak species be most competitive in moisture environment than light or nutrient one, and that there are least differentiated among oak species for soil moisture condition. Cluster and PCA ordination showed that Q. mongolica and Q. acutissima were more closely arranged than Q. mongolica and Q. variabilis. From these results, it can be explained that Q. mongolica have more similar ecological niche with Q. acutissima than with Q. variabilis, consequently competition between Q. mongolica and Q. acutissima is intensive than Q. mongolica and Q. variabilis for environment condition, especially in soil moisture.

Hydro-ecological characterizations in groundwater dependent ecosystem (지하수 종속 생태환경에서 수문-생태학적 특성 조사 및 분석)

  • Kim, Hee-Jung;Hyun, Yun-Jung;Lee, Kang-Kun
    • Journal of Wetlands Research
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    • v.11 no.3
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    • pp.1-8
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    • 2009
  • The groundwater dependent ecosystem associated with a natural stream is the area where mixing and exchange of surface water and groundwater occurs due to large chemical and hydraulic gradients. Surface-groundwater interactions play an important role in biogeochemical processes in groundwater dependent ecosystems and make this area a hydro-ecological hot spot. The objective of this study is to characterize the groundwater dependent ecosystem in a natural stream where nitrate contamination of stream water is observed by means of hydrogeological, chemical, and biological methods. In this study, vertical flow exchange(hyporheic flow) rates between stream and groundwater were estimated based on vertical hydraulic gradients measured at mini-piezometers of various depths. To investigate the biological natural attenuation potential, biological analyses using polymerase chain reaction(PCR)-cloning methods were performed in this study. Results show that the veritical hyporheic water fluxes affect nitrate concentrations and bacterial densities in groundwater dependent ecosystems to some degree. Also, denitrifying bacteria were identified in hyporheic soils, which may support the biodegradation potential of the groundwater dependent ecosystems under certain conditions.

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A Review on Environmental Impact Assessment and Policy Utilization through the Establishment of Ecological Outlook and Evaluation System (자연생태 전망평가체계 마련을 통한 환경영향평가 및 정책 활용방안 고찰)

  • Who-Seung Lee
    • Journal of Environmental Impact Assessment
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    • v.32 no.5
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    • pp.363-376
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    • 2023
  • As the risk of biodiversity reduction and extinction becomes serious due to climate change and indiscriminate development, the importance of conservation of the natural environment and ecosystem is increasing. In this situation, Ireviewed that overseas cases of the ecological outlook and evaluation system aimed at providing information on natural resources and ecosystem change. As a results, other countries showed that various research institutes have been carrying on field surveys by classification group, but it was different from us that the investigated data are collected and managed in an integrated manner and repeatedly provided within a short period of time. In addition, it was analyzed that it was highly utilized in policy and environmental impact assessment by providing evaluation-based prediction and outlook information along with basic survey data. Based on this, the limitations of information use in our wildlife surveys and environmental impacts assessments were analyzed, and the estabilishment of a ecology outlook and evaluation system and policy support measures were considered. In addition, based on the proposed outlook and evaluation system preparation plan, a policy direction that can be effectively used in domestic natural ecosystem policies was proposed.

환경칼럼 - 지금 이 순간, 지구에서 곤충이 사라진다면?

  • Kim, Jin-Man
    • Bulletin of Korea Environmental Preservation Association
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    • s.414
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    • pp.2-5
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    • 2014
  • 지금 이 순간 인간이 사라진다면 지구의 생태계는 어떻게 될까? 아무 일 없이 잘 돌아갈 것이다. 생태계는 더 푸르고 짙어질 것이다. 만일 곤충이 사라진다면? 누가 식물의 수분을 도와주고 숲을 솎아주고 자연을 정화해줄 것인가? 아마도 곤충이 사라진 지구의 생태계는 조만간 사라져 버릴 것이다.

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