• 생태와환경
• /
• 제45권4호
• /
• pp.490-498
• /
• 2012

This study demonstrates the investigation of zooplankton communities (e.g. rotifers, cladocerans and copepods) and environmentally related driving factors (e.g. elevation, area size, water depth, types of dike construction, and bottom substrates). We hypothesized that zooplankton community structure and composition would be influenced by ambient driving forces in different scales of the irrigation ponds (Dumbeong). A total of 66 zooplankton species/groups (56 rotifers, 9 cladocerans, 1 copepods) were found and identified at 45 Dumbeong of Goseong region (i.e. Goseong-gun) in 2011. The rotifers occupied 84.9% of the total zooplankton abundance. We could categorize a clear separation of zooplankton communities into 4 different patterns based on cluster analysis. Zooplankton diversities in Dumbeongs were lower than those in natural ponds or wetlands. In addition, community structure of zooplankton was also simpler and had a broken stick distribution based on SHE analysis. Species composition in each Dumbeong was not significantly discriminated each other. The result of canonical correspondence analysis (CCA) pinpointed that significant influential variables upon zooplankton community were dissolved oxygen percent saturation, pH, and Dumbeong's material. This study indicated that morphological type of the Dumbeong and its water quality could determine the community structure of zooplankton. Furthermore, the connectivity between ambient habitats and materials could be necessary to be rigorously considered in respect to producing the Dumbeongs to subsidize alternative habitats for wetland ecosystem in freshwater landscape.

• 한국환경생태학회지
• /
• 제7권2호
• /
• pp.213-220
• /
• 1994

본 연구는 덕유산 국립공원을 대상으로 서식 조류군집을 파악하고, 이의 보호 및 관리 방안을 제시하기 위하여 실시되었다. 조사구역으로는 주 등산로 2개소를 선정하여, 1993년 2월 20일과 7월 22일 2회에 걸쳐 야생조류에 대해 선조사법에 의해 실시되었다. 조사지에서 관찰된 조류는 총 5목 17과 34종이었고 이 중 천연기념물 제 323호인 새매, 황조롱이와 희귀조류인 큰오색딱다구리, 홍여새가 관찰되었다. 해발 1,000m 이상의 초원지역은 갈색양진이의 겨울철 월동지로, 붉은뺨멧새의 여름철 번식지로 이용되고 있으며 이 지역에 대한 보호가 시급하다고 판단된다. 무주구천동 계곡은 계곡성 조류에게 20년 전에는 양호한 서식지였으나, 인간의 이용밀도의 증가로 인해 계곡성 조류가 다수 감소한 실정이므로 이 지역에 대한 관리가 요망된다.

• Journal of Forest and Environmental Science
• /
• 제29권2호
• /
• pp.165-172
• /
• 2013

The habitats characteristics of Rhododendron micranthum Turcz. were investigated to compile basic data for conservation and restoration. Natural habitats were located at altitudes of 100-500 m with inclinations of $10-35^{\circ}$. Rhododendron micranthum population was classified into Pinus densiflora dominant population. In the study sites, soil organic matter, total nitrogen, available phosphate, exchangeable potassium, exchangeable sodium, exchangeable calcium, exchangeable magnesium, cation exchange capacity and soil pH were 4.10-8.64%, 0.18-0.46%, 8.69-26.70 $mgkg^{-1}$, 0.10-0.23 $cmol^+kg^{-1}$, 0.06-0.10 $cmol^+kg^{-1}$, 0.85-4.10 $cmol^+kg^{-1}$, 0.24-0.64 $cmol^+kg^{-1}$, 12.76-20.90 $cmol^+kg^{-1}$, 4.34-5.15. Rooting rate is too low, cutting propagation, breeding methods are not good. Also, this study was investigated seed germination of R. micranthum depends on soaking treatment. R. micranthum was soaked with tap water for four days, the average values of germination day were represented of 70%/1 week.

• 한국자원식물학회지
• /
• 제25권1호
• /
• pp.89-95
• /
• 2012

한라산에 자생하는 위기식물 만년콩의 보전 및 복원을 위한 기초자료를 제공하기 위하여 생육지 식물사회학적으로 조사하였다. 만년콩의 자생지는 해발 220 m에 위치하고 경사는 $40-50^{\circ}$로 매우 가파른 암석지대로, 돈네코 계곡의 북사면 일대에 소수의 개체가 불연속적이며 제한적으로 분포하였다. 조사는 만년콩이 확인된 지역($10{\times}20\;m$)과 분포하지 않는 인근지역을 조사하여 비교 하였다. 조사구는 구실잣밤나무 교목층(70-80%)이 수고 10-16 m로 형성되어 33종류의 식물종이 확인되었으며 본 연구에서 확인된 위협 요인으로는 다른 종과 생육지 경쟁에서의 도태, 매우 가파른 자생지의 입지 등 자연적인 요소와 계곡 정비와 같은 인위적인 요소로 판단되었으며, 보전을 위한 현지 내외 보호가 필요할 것으로 판단된다.

• 한국환경과학회지
• /
• 제16권3호
• /
• pp.277-285
• /
• 2007

The purpose of this study is to analyze seasonal distribution of insects, birds, fishes, and benthos for Gongji stream in Chuncheon and to explore some strategies towards creating a desirable close-to-nature stream. The number of species occurred in the study stream was 23 for butterflies and 149 for other insects, 23 for birds, 15 for fishes, and 47 for benthos. The study stream was dominated by Artogenia rapae, Polygonia caureum, Cyntia cardui for butterflies, and Passer montanus, Anas crecca, Anas platyrhynchos for birds. The dominant species were Rhynchocypris oxycephalus, Zacco plutypus, Carassius auratus for fishes, and Limnodrilus sp. 2, Chiranumus sp. 2, Hydropsyche KUb for benthos. Attracting insect species of higher density requires planting of host plant species and stabilization of plant coverage against disturbances. To enhance species diversify and density of birds, it is desirable to provide diverse habitats including preservation of downstream wetland and natural vegetation, creation of sand bars and islands with sand and gravel, and restriction or traffic passing and parking. Restoring fish and benthos habitats needs improvement of water quality, layout of gravels and stones on sand-dominant streambed, and use of close-to-nature revetment techniques.

• 한국지역지리학회지
• /
• 제20권3호
• /
• pp.334-343
• /
• 2014

우리나라의 말라리아는 1990년대 초에 재 출현한 이후로 그 발병사례가 지난 10년 동안 증감을 거듭해오고 있다. 말라리아의 주된 발병 지역이 비무장지대 인근의 남북한 경계를 따라 분포하고 있는 점을 고려할 때, 우리나라 말라리아 발생은 이 지역의 자연과 거주 환경에 의해 영향을 받고 있는 듯하다. 말라리아는 말라리아 원충을 옮기는 모기에 의해 감염되는 전염병이므로 이 질병의 발병율은 특정 기후 및 사회인구학적 인자들과 밀접한 연관성을 가지고 있다. 본 연구에서는 말라리아 발생의 공간적 특성이 모기 서식환경의 비율, 모기서식지와 주거지역 간의 거리, 도시화에 따른 자연환경 및 사회인구적 환경, 그리고 해당 지역의 국지적 지형과 관련이 있음을 논의하였다.

• 환경영향평가
• /
• 제19권2호
• /
• pp.127-140
• /
• 2010

This study investigates the relation between the location of a habitat and the ecological connections according to the habitat type in the riparian zone at the Nonsan Stream and Yanghwa Stream. Stream habitat is classified into nine types for the aquatic insects and fish. For vegetation and birds, habitat is classified into two types of medium-scale streams, including both physical and chemical streams are analyzed accordingly. Nowadays, The fundamental goal of the river environment restoration enterprise is the rehabilitation or the restoration of the characteristic the river scenic or environment. For instance, The Channel habitats which has physical nature environment such as flat, speedy rapids, or closed-channel wetland, pool are constructed by artificial, Consequently, make them autogenesis smoothy eco-environment. However, the river environment are controlled not only physical environment, but it also need reasonable the quality of the water to compose smoothly. Finally, understanding what influence are effecting on physical habitat environment which are made by natural factors to water quality are very important factor for the river environment restoration enterprise Therefore, In this research, we are targeting to a basin to investigate the environment of the physical channel habitat and evaluate the changing of the water quality. This results will be a important characteristic that can judge the physical habitat and reciprocality connected to the water quality or adequacy of restoration technology. Therefore in this study, as a step to quantify functions and values of habitats and definite factors to perform habitat, we selected a representative stream of sand-stream, gravel-stream to classify habitat characteristics and quantified the physical, chemical, biological characteristics.

• 한국수자원학회논문집
• /
• 제52권spc2호
• /
• pp.791-799
• /
• 2019

본 연구는 보가 다수 분포하고 있는 만경강을 대상으로 항공사진(1948, 1967, 1973, 1989, 2010)을 이용하여 서식처 유형을 분류하고, 시간에 따른 서식처 구조 변화를 설명하였다. 서식처 구조는 지형과 하도서식처 중 물이 있는 서식처로 구분되었으며, 지형은 나지, 식생부, 수면부, 경작지, 교란지로 분류하였으며, 하도서식처는 자연여울, 인공여울, 평여울, 머리완도, 꼬리완도, 중앙완도, 못, 첩수로로 구분하여 면적을 산출하여 백분율로 비교하였다. 1970년대 골재채취와 1980년대 보 설치로 인하여 나지는 소멸되고 수면부와 식생부는 급격히 증가함에 따라, 평여울은 급격하게 감소한 반면, 흐름이 다소 정체되어 습지와 유사한 중앙완도 서식처의 비율은 급격하게 증가하였다. 또한, 나지와 식생부 위에 존재하는 머리완도, 꼬리완도, 못과 같은 서식처는 보 설치 이후 사라지거나 일부만 남아있다. 본 연구는 생태적인 하천관리를 위한 기초자료로서 향후 교란에 따른 하천 환경의 잠재력을 파악하는데 기초자료로 이용할 수 있을 것으로 판단된다.

• 농업생명과학연구
• /
• 제53권2호
• /
• pp.65-75
• /
• 2019

Stem and root of elm trees have used as traditional medical materials, but there is little information on the distribution and resources of habitats. Korean native growing Ulmus spp. (U. davidiana var. Japonica, U. parvifolia, U. davidiana, and U. macrocarpa) genetic resources studied through The National Forest Inventory of Korea data and field survey. The distributions of U. davidiana var. japonica according to elevation distributed evenly. Both U. parvifolia and U. davidiana were inhabited mostly at less than 200 m of altitude. Each Ulmaceae species widely were distributed nationwide, but a dominant species was different depending on locals. It observed that Ulmaceae inhabits mainly in steep slopes of 31-45 degrees. Most of the habitats regenerated by natural seeding and the most abundant species were a codominant tree. Distribution of trees in U davidiana var. japonica was 7 m-13 m, and in young U. parvifolia and U. macrocarpa, more than 25% of young trees less than 7 m observed. The distribution of the diameter of breast height of the U. davidiana var. japonica was 46.4% for 11-20 cm, 52.6% for 11-20 cm in U. parvifolia. The average T/R ratio was 0.83, and the mean weight ratio of root bark was 62%. As the results of this study, the domestic Ulmaceae biomassare very small. It is difficult to harvest in that the habitat on the slope. Thus, it is too hard to develop functional materials using biomass at present. Therefore, it is necessary to develop technology for the selection and propagation of elite trees of Ulmaceae.

• Proceedings of the National Institute of Ecology of the Republic of Korea
• /
• 제4권4호
• /
• pp.159-176
• /
• 2023

The conservation of the raccoon dog (Nyctereutes procyonoides) in South Korea requires the protection and preservation of natural habitats while additionally ensuring coexistence with human activities. Applying habitat map modeling techniques provides information regarding the distributional patterns of raccoon dogs and assists in the development of future conservation strategies. The purpose of this study is to generate potential habitat distribution maps for the raccoon dog in South Korea using geospatial technology-based models. These models include the frequency ratio (FR) as a bivariate statistical approach, the group method of data handling (GMDH) as a machine learning algorithm, and convolutional neural network (CNN) and long short-term memory (LSTM) as deep learning algorithms. Moreover, the imperialist competitive algorithm (ICA) is used to fine-tune the hyperparameters of the machine learning and deep learning models. Moreover, there are 14 habitat characteristics used for developing the models: elevation, slope, valley depth, topographic wetness index, terrain roughness index, slope height, surface area, slope length and steepness factor (LS factor), normalized difference vegetation index, normalized difference water index, distance to drainage, distance to roads, drainage density, and morphometric features. The accuracy of prediction is evaluated using the area under the receiver operating characteristic curve. The results indicate comparable performances of all models. However, the CNN demonstrates superior capacity for prediction, achieving accuracies of 76.3% and 75.7% for the training and validation processes, respectively. The maps of potential habitat distribution are generated for five different levels of potentiality: very low, low, moderate, high, and very high.