• ALGAE
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• 제22권2호
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• pp.141-146
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• 2007

Seagrass bed is an important component in coastal and estuarine ecosystems, providing food and habitats to a wide variety of marine organisms. Recently, seagrass coverage has declined significantly due to anthropogenic impacts such as cultural eutrophication and reclamation, and thus efforts are under way to prevent further losses and restore disturbed seagrass habitats worldwide. Seagrass transplantation techniques for habitat restoration include vegetative and seed-based methods. Seagrass seeds can be collected easily, and sowing seeds is an economically effective method for large-scale restoration. However, large numbers of seed can be lost by seed predation and physical disturbance in the planting areas. In the present study, Zostera marina seeds were coated with loess to reduce seed loss by predation and sweeping away by the water currents, and germination rates of coated seeds and seedling growth were examined to assess the feasibility of the seed-coating method for large-scale restoration. Germination rate of the coated seeds with loess was significantly higher than that of the uncoated seeds. Additionally, seedling growths were not significantly different between the coated and the uncoated seeds. These results suggest that coating of eelgrass seeds with loess enhances success of seed germintion with no harmful effects on seedling growth. Therefore, the seed coating method using loess may be an effective and applicable seedbased transplanting technique for large-scale restoration.

• 환경생물
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• 제31권1호
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• pp.1-9
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• 2013

본 연구는 해양환경이 크게 교란을 받고 있는 4개 저서환경을 선택하여 연체동물 중 어떠한 종이 기회종의 특성을 보이는지를 조사하였다. 기회종의 특성을 보인 5종의 이매패류에 대한 분포특성을 파악하고자 하였다. 이매패류인 애기반투명조개 (Theora fragilis), 대양조개(Macoma incongrua), 종밋(Musculista senhousia) 등이 빈 산소 현상을 보이는 반폐쇄성 연안역이나 유기물 축적이 많은 퇴적물을 가진 항만해역에서 우점하여 서식하고 있었으며, 소형 개체인 말발굽조개 (Thyasira tokunagai)와 쇄개량조개 (Raetellops pulchella)는 외해역의 폐기물 해양투기장에서 우점하는 종으로 나타났다.

• The Korean Journal of Ecology
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• 제23권6호
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• pp.453-460
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• 2000

The forest vegetation of Mt. seondal was classified into eight communities and one afforestation by the phytosocialogical method (Z-M method). In general, Quercus mongolica trees occupied most of the area, while afforestation forest was distributed on the lower slope, cultivated land, and at the vicinity of village. The vegetation on the top part of Mt. Seondal was comparatively well preserved, but that in the lower areas has been disturbed heavily by human activity and some had mixed forests composed of pine trees, oaks, ashes, and Rhododendron micrantum shrub. By cluster analysis method. nine groups were identified as follows : Quercus mongolica group, Q. mongolica - Pinus densiflora group, Q. mongolica - Rhododendron schlipen - bachii group, Q. mongolica - Symplocos chinensis for. pilosa group, P. densiflora group, Juglans mandshurica group, Fraxinus mandshurica group, Betula costata group and Larix leptolepis group. These groups showed differences in species composition, but Quercus mongolica, Q. mongolica - P. densiflora, Q. mongolica - R. schlippenbachii and Q. mongolica - S. chinensis for. pilosa groups among them showed very similar floristic composition to each other. In the relationship between polar ordination axes and environmental variables, altitude was the environmental factor determining variation in species composition along axis X and soil moisture was the environmental along axis Y. They were the main factors in determining forest vegetation. The result of cluster analysis and polar ordination for the forest vegetation were corresponded to those of phytosocialogical classification in classifying vegetation.

• 한국조경학회지
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• 제24권4호
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• pp.123-131
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• 1997

Since the industrial revolution. the growth of cities has been especially apid and the rate of ulbanization has been high. This urban development is encroaching on the natural environment because the cities are developed with not only residential estates, industrial area and buildings but also with infrastructure. The surface area of the city is sealed ,with pavement whereas nature is disturbed and modified. The hydrological cycle in the city is inf1uenced by the change of land use I. e., from forest to agricultural land, talc draining of wetlands and above all the increase of built-up areas. The surface retention and interception of precipitation in the city is reduced. because the surface area is now smooth and solid. The characteristics of the hydrological cycle in the city are increased runoff, reduced evapotranspiration and infiltraction . We have too much faith in technology although it may cause more unforseen problems. We build more river banks and 'emulation dams and straighten rivers and streams in order to protect ourselves from disasters.. However. the results of hose developments are often higher$.$ water levels, the disturbance of aquatic ecosystems and the reduction of biodiversity. Therefore, we should examine problems from the hydrological cycle in cities and study a natural system as close cities to nature as possible. This paper shows the problems caused by the hydrological cycle in the city. The ecology-oriented method and design must be used in order to protect our environment from dicturbance.

• 한국환경복원기술학회지
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• 제12권3호
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• pp.83-97
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• 2009

The objects of study is to propose criteria for physical river disturbance assessment and as case study to show the application results for river improvement. For this purpose, the river disturbance assessment method for past disturbance process and the present-day potential natural state of stream is proposed. To assess the disturbance of the Youngcheon River caused by river improvement, One ares of Nam River was selected for the reference reach and two areas of Youngcheon River were selected for the comparison reach. And these reaches were surveyed and analyzed according to applying criteria of the river disturbances assessment. The assessment indices were physical factors as like epifaunal (bottom), embededness, velocity/depth regime, sediment deposition, channel flow status, channel alteration, frequency of riffles, bank stability, vegetative protection and riparian zone etc. The results showed that physical river environment in Youngcheon River area was disturbed by artificial revetment and bed excavation, consequently this disturbance give rise to impact of ecosystem in river. Hereafter, the criteria for river disturbance assessment are needed to consider various river characters as bed materials and bed slop etc.

• 한국산학기술학회논문지
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• 제16권12호
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• pp.8901-8907
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• 2015

기존의 가로등은 배광특성 조절이 어려워 주변 환경 및 도로의 상황에 따라 빛을 고루 전달하지 못하므로, 눈부심, 농작물 결실저해 및 수면 방해 등의 광공해를 발생시키고 있는 실정이다. 본 논문에서는 이러한 문제를 해결하기 위해 주변 환경 및 도로 상황에 따라 조사되는 빛의 각도를 조절할 수 있는 새로운 구조의 LED 가로등 기구를 제안 하였다. 제안된 LED 가로등 기구는 반원구조의 형상을 갖는 각도 조절 장치를 이용하여 도로의 종류 및 특성에 따라 배광특성을 조절 할 수 있도록 하였다. 측정 및 모의실험결과 배광각도는 최소 $100^{\circ}$에서 최대 $154^{\circ}$까지 조절이 가능함을 확인하였고, 평균조도는 KS 규정의 15%를 초과하였으며, 종합 균제도는 KS 규정의 50% 이상을 초과하여 성능이 우수함을 확인할 수 있었다. 따라서 본 연구를 통하여 개발된 대용량 LED 가로등 기구는 광공해를 해소하고 광원 분포의 균제도 최적화와 눈부심을 최소화 할 수 있을 것으로 사료된다.

• 한국조경학회지
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• 제34권3호
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• pp.41-58
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• 2006

Rural areas dominates the country landscapes in size with less population and rich traditional heritages as well as natural landscapes. Rural community groves (RCG) and Dangsan groves have been established by community residents during a few hundred years, and most of them have been disturbed. Only a few RCGs and Dangsan groves remain for an extensive period with efforts from community residents. These remnant RCGs and Dangsan groves are highly evaluated representing Korean rural cultural landscapes. Sound understanding on the structure of the rural landscapes and their role on the rural community environment is required to provide an appropriate policy for managing rural landscapes. This study aims to understand the characteristics of RCGs and Dangsan groves in the cultural landscapes, to investigate policies and issues of the advanced countries on RCGs and Dangsan groves, and to overview domestic policies for rural landscapes. The study results showed that there is a close relationship between RCGs and main issues discussed in EU countries. Ministry of Agriculture & Forestry of Korea, Ministry of Environment and Rural Development Administration have to focus on the potential of RCGs and Dangsan groves for multi-functions of agricultural and rural areas, natural streams, rural amenity, direct subsidy for landscape preservation and rural tourism. Based on the findings, this study suggests that RCGs and Dangsan groves will provide benefits to develop rural-mountain-sea villages and to enhance country's landscapes as well as local landscapes.

• 한국균학회지
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• 제20권3호
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• pp.204-215
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• 1992

우리나라 4개 도(경기, 충북, 경북, 전북)의 9개 지역에서 19종의 콩과식물 주변으로부터 65곳 토양 표본을 채취, 내생균근균을 분리동정하여 생태학적 분석을 하였다. 그 결과 4속 21종이 발견되었고, Glomus속이 47.6%로서 출현빈도가 가장 높았고 Gigaspora속은4.8%로서 다른 속에 비해 빈도가 아주 낮았다. 콩과식물 주변 토양에서 가장 보편적으로 발견되는 내생균근균의 종은 Acaulospora laeuis와 Glomus laminated spores cf. macrocarpus var. macrocarpus.였다. 19종 콩과식물 중 Cassia mimosoides var. nomame와 Kummerowia striata의 두 식물 주변토양에서 내생균근균의 종수가 가장 많이 관찰되었다. 분리된 내생균근균의 포자수는 토양(건조하지 않은 토양임) 10g당 $0.3{\sin}10$개로 나타났다. 생태적으로 교란된 지역과 자연생태의 식생에서 채집한 콩과식물 주변토양의 내생균근균의 종 다양성을 비교한 결과 교란된 지역이 높은 것으로 나타났다.

• 한국환경복원기술학회지
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• 제21권5호
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• pp.81-96
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• 2018

The purpose of this study is to analyze the characteristics of vegetation changes and structures in the buffer green zone of Sihwa Industrial Complex and propose environmental, ecological and multi-functional vegetation management directions. The density of the Pinus thunbergii decreased from $23.1trees/100m^2$ in 2006 to $9.6trees/100m^2$ in 2017 due to the influence of thinning works. Its green volume increased from $0.97m^3/m^2$ to $2.02m^3/m^2$, contributing to the improvement of the atmospheric environment and promotion of biodiversity. The density of deciduous broad-leaved trees at the top maintained at $18{\sim}21trees/100m^2$. In the areas where the understory vegetation was removed, Pueraria lobata spread as an invasive plant and disturbed the forest. In the areas where the understory vegetation was not removed, various native plant species including the Rhus javanica and Celtis sinensis were introduced and contributed to the development of a forest in a multiple structure. There was a concern with the spread of Robinia pseudoacacia which developed into understory vegetation in Pinus thunbergii forest and some canopy forest. The study proposed vegetation management directions for the back, top and front side according to the physical structure of large-scale buffer green zone formed in a long linear form and the usage characteristics of adjacent land.

• 한국환경복원기술학회지
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• 제17권1호
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• pp.13-25
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• 2014

The study aims to investigate and analyze actual situations of managing topsoil at forest development sites based on their types, in pursuit of conservation and effective use of national land. To do this, I selected target areas by deducting the typical types of forest development and analyzed the condition of soil at the target areas before and after development. In addition to this, I interviewed associated construction staffs to conduct study on present situations of topsoil management and find out its problems. I also surveyed of relevant experts, with the intention of seeking solutions. The results of the study have been shown that firstly, experts preferred collecting and recycling of topsoil as methods of improvement of soil conditions for plant growth. Secondly, the importance of topsoil has been well noticed and there were few construction sites using the methods. However, working and economical problems have disturbed carrying out these solutions. Thirdly, after constructions, organic matter and total-nitrogen content decreased in general which were necessary for plant growth in terms of soil conditions.