• Title/Summary/Keyword: 수생식물

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A study on variation of velocity characterisics in vagetated flow (식생 하천의 유속특성 변화 연구)

  • Park, Hyun Keun;Roh, Young Sin;Jung, Sung Won
    • Proceedings of the Korea Water Resources Association Conference
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    • 2019.05a
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    • pp.291-291
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    • 2019
  • 하천에서 식생은 자연적으로 존재하는 수생식물의 집단을 의미하기도 하지만 자연 저항체로서 하천의 평균 흐름을 교란하고 변화시킨다. 식생의 성장은 흐름 저항을 발생시켜 일시적으로 수위유량관계의 전이(shift)를 유발한다. 이러한 수위-유량관계의 전이는 식생의 성장 및 전도와 소멸로 발생하는 식생의 구조변화에 따라 측정 단면에 대한 평균유속의 변화를 발생시킨다. 본 연구에서는 식생의 구조변화에 따른 평균유속 특성의 변화를 사례를 통해 살펴보았다. 고령군(귀원교) 지점은 하천 좌우안 식생의 흐름 저항을 받아 측정 평균유속의 영향을 받는 지점으로, 식생 변화에 대한 모니터링 결과를 토대로 수리특성을 분석하여, 식생의 활착 및 전도에 따른 평균유속의 변화를 분석하였다. 고령군(귀원교) 지점의 수위-평균유속 관계는 식생의 활착 또는 전도에 따라 서로 다른 형태의 고리형태(loop)를 보이는 것으로 확인되었다. 식생이 활착 후 전도되면서 측정된 유속성과는 수위하강시 유속이 증가하는 역 고리형태(loop)를 보이는 것으로 관찰되었다. 식생이 전도된 이후의 측정성과는 수위가 상승함에 따라 유속이 증가하는 정상적인 수위-유속의 고리형태(loop)를 보인다.

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Vegetation Characteristics of Mankyua chejuense Habitats (제주고사리삼의 자생지 유형 및 식생 특성)

  • Hyeon, Hwa-Ja;Moon, Myung-Ok;Kim, Moon-Hong
    • Korean Journal of Plant Resources
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    • v.24 no.4
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    • pp.395-403
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    • 2011
  • This study was conducted to investigate the habitat positional environment and vegetation properties of Mankyua chejuense. The habitats were classified into two types depending on the depth of the habitat, the ratio of rock exposure, the dominant species and the surrounding vegetation, which affected the vegetation of the habitats. The habitats with a high ratio of rock exposure showed a distinctive geographical boundary to the adjacent region and most of them were composed of trees that grow in humid environment. On the contrary, in the soil-rich habitats, the depth was shallow, soil layer was well developed, and the trees were introduced from the adjacent areas. However, the dominant species in the herbaceous layer were aquatic plants, which indicated that the habitats had the properties of wetland. Therefore, it was found that thes habitats of Mankyua chejuense have the properties similar to those of marshland. For the preservation of Mankyua chejuense, it is very important to make the habitats maintain such properties of wetland.

Net Primary Production, Annual Accumulation of Organic Carbon and Leaf Decomposition in Salix Plant Community (하천변 버드나무군락의 1차 순 생산량, 유기탄소 흡수량과 낙엽분해)

  • Han, Seung-Ju;Kim, Hyun-Woo;Kim, Hae-Ran;Kim, Hyea-Ju;Han, Dong-Uk;Park, Sang-Kyu;You, Young-Han
    • Journal of Wetlands Research
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    • v.12 no.1
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    • pp.15-22
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    • 2010
  • We measured net primary productivity, annual accumulation of organic carbon and leaf decomposition of Salix community in the flood plain of the Han River and the Nakdong River. Net primary productivity, annual accumulation of organic carbon of the Salix community were 22.5ton/ha/yr(16.7ton/ha/yr-31.2ton/ha/yr) and 9.7ton C/ha/yr(7.5ton C/ha/yr-14.0ton C/ha/yr) respectively, which showed the highest values among the woody plant communities reported in the Korea. It means that planting Salix in the flood plain of the river is the best way to remove carbon dioxides. The faster leaf decomposition occurred around, under and the herb of Salix community in order. Leaf decomposition rate of Salix was higher than that of mesophytes, but lower than that of hydrophytes.

Anti-Oxidant Activity of Eichhornia crassipes Native to Asia (아시아 원산지 부유 수생식물 부레옥잠의 항산화 효능 분석)

  • Jiwon Kong;Hyokyung Shin;Hanjoo Bae;Minji Yoon;Joonho Kim;Seho Kim;Sangmin Yoo;June Hyun Kim
    • Proceedings of the Plant Resources Society of Korea Conference
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    • 2022.09a
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    • pp.95-95
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    • 2022
  • Kadsura heteroclita (Roxb.) Craib and Eichhornia crassipes (Mart.) Solms. have been known to give effects on pimple. Jatropha gossypiifolia L., Anisomeles indica (L.) Kuntze, Kadsura heteroclita (Roxb.) Craib extracts have been used for cough cold for a long time. To test whether Jatropha, Anisomeles, Kadsura and Eichhornia have anti-oxidant acitivity, we performed DPPH assay. Jatropha showed 91.98% anti-oxidant activity and Anisomeles, Eichhornia and Kasuda showed 47.91%, 47.35% and 32.00% anti-oxidant activity, respectively, compared to Ascorbic acid control. To further determine whether these extracts have any cytotoxic effects, we used MTT assay with these extracts in Raw264.7 cells. Jatropha showed 45.10% survival rate and Anisomeles, Eichhornia and Kasuda showed 76.78%, 86.24% and 82.88% survival rate, respectively, compared to negative control. Taken together, these results suggest that Jatropha showed higher anti-oxidant activity than other plant extracts, however it has cytotoxic effect. Therefore, we consider Anisomeles, Eichhornia and Kasuda extracts might be a good candidate to develop as a therapeutic agent with higher anti-oxidant acitivity and lower cytotoxic effects among the tested plant extracts.

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Classification by Zooplankton Inhabit Character and Freshwater Microbial Food Web: Importance of Epiphytic Zooplankton as Energy Source for High-Level Predator (동물플랑크톤의 서식 특성에 따른 분류와 먹이망: 상위포식자의 에너지원으로서 부착성 동물플랑크톤의 중요성)

  • Choi, Jong-Yun;La, Geung-Hwan;Jeong, Kwang-Seuk;Kim, Seong-Ki;Chang, Kwang-Hyeon;Joo, Gea-Jae
    • Korean Journal of Ecology and Environment
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    • v.45 no.4
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    • pp.444-452
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    • 2012
  • We conducted a comprehensive monitoring for freshwater food web in a wetland system (Jangcheok Lake), from May to October, 2011. Monthly sampling for zooplankton, fish as well as organic matters, was implemented. In order to understand the food web structure and energy flow, we applied stable isotope analysis to the collected samples, based on ${\delta}^{13}C$ and ${\delta}^{15}N$ values of epiphytic particulate organic matter(EPOM) and particulate organic matter (POM), epiphytic and planktonic zooplankton, fish (Lepomis macrochirus). In the study site, epiphytic and planktonic zooplankton was 24 and 30 species, respectively, and coincidence species between epiphytic and planktonic zooplankton were 20 species. Epiphytic zooplankton were more abundant during the spring and early summer (May to July); however, planktonic zooplankton were more abundant during the autumn (September to October) season. Stable isotope analysis revealed that fish and epiphytic zooplankton had seasonal variations on their food sources. EPOM largely contributed epiphytic zooplankton in spring (May), but increasing contribution of POM in autumn (September) was detected. However, planktonic zooplankton depended on only POM in both seasons. Fish utilized both epiphytic and planktonic zooplankton, but small sized (1~3 cm), fish preferred epiphytic zooplankton, where as larger sized (4~7 cm) fish tended to consume planktonic zooplankton, and epiphytic zooplankton had important role in energy transfer. This pattern was clear when results of spring and autumn stable isotope analysis were compared. From the results of this study, we confirmed that wetlands ecosystem supported various epiphytic and planktonic zooplankton species, they depend on other food items, respectively. L. macrochirus also showed a difference of food source according to the body size, they depend on seasonal density change of zooplankton. In particular, epiphytic zooplankton was very important for growth and development of young fish in the spring.

Fish Distribution and Management Strategy for Improve Biodiversity in Created Wetlands Located at Nakdong River Basin (낙동강 신규조성 습지의 어류 분포와 종다양성 증진을 위한 관리방안)

  • Choi, Jong Yun;Kim, Seong-Ki;Park, Jung-Soo;Kim, Jeong-Cheol;Yoon, Jong-Hak
    • Korean Journal of Environment and Ecology
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    • v.32 no.3
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    • pp.274-288
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    • 2018
  • This study investigated the environmental factors and fish assemblage in 42 wetlands between spring and autumn of 2017 to evaluate the fish distribution and deduce the management strategy for improving biodiversity in created wetlands located at the Nakdong River basin. The investigation identified a total of 30 fish species and found that the most of wetlands were dominated by exotic fishes such as Micropterus salmoides and Lepomis macrochirus. Fish species such as Rhinogobius brunneus, Opsariichthys uncirostris amurensis, Zacco platypus were less abundant in the area with high density of Micropterus salmoides (static area) because they preferred the environment with active water flow. The pattern analysis of fish distribution in each wetland using the self-organizing map (SOM) showed a total of 24 variables (14 fish species and 10 environmental variables). The comparison of variables indicated that the distribution of fish species varied according to water depth and plant cover rate and was less affected by water temperature, pH, and dissolved oxygen. The plant cover rate was strongly associated with high fish density and species diversity. However, wetlands with low plant biomass had diversity and density of fish species. The results showed that the microhabitat structure, created by macrophytes, was an important factor in determining the diversity and abundance of fish communities because the different species compositions of macrophytes supported diverse fish species in these habitats. Based on the results of this study, we conclude that macrophytes are the key components of lentic freshwater ecosystem heterogeneity, and the inclusion of diverse plant species in wetland construction or restoration schemes will result in ecologically healthy food webs.

An Analysis of the Behavior and the Preference of Roof Spaces Depending on Building Types - A Focus on the Case of Seoul, Korea - (건물용도별 옥상공간의 이용행태 및 선호도 분석 - 서울특별시의 사례를 중심으로 -)

  • Kim, Eun-Jin;Jung, Tae-Yeol
    • Journal of the Korean Institute of Landscape Architecture
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    • v.42 no.6
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    • pp.10-20
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    • 2014
  • Today, most roof spaces are being designed as places for resting. The use of the roof spaces needs to be raised otherwise, budgeting or costs involved can be wasteful. A well-made plan is needed to increase the use of the roof spaces. The behavior of and preference for roof spaces could differ depending on building usage because the users of these roof spaces can be different. Therefore, this study selected 4 building types depending on usage: public buildings, educational and research buildings, medical buildings, and commercial buildings. Two buildings that created roof spaces per building type were selected. A survey was undertaken of the user experience of roof spaces on the buildings. The behavior and preference of roof spaces depending on building types were analyzed and the results are as follows. The behavior of using roof spaces regarding purpose, motivation, frequency, and average length of stay were different depending on the building types. In terms of purpose, over all four building types, taking a rest was the primary reason for using roof spaces. However, talking and smoking in public buildings, smoking, taking a walk or stretching, and viewing the exterior landscape in educational and research buildings, taking a walk or stretching and talking in medical buildings, taking care of children and talking in commercial buildings were also important reasons for using roof spaces. The preference of roof space components such as plants, paving materials, and facilities were different depending on the building types. In terms of plants, the users of public buildings preferred herbaceous plants and vegetables/aquatic plants more than the users of other building types. The users of medical buildings preferred vegetables/aquatic plants, and the users of commercial buildings preferred arbores, herbaceous plants, and vegetables/aquatic plants more than the users of other building types. This study provides empirical data for the behavior and the preference of roof spaces depending on building types. These findings could provide new insights into how to increase the use of roof spaces.

The Flora of Forest Wetland in the Chungcheongbuk-do (충청북도 일대 산림습원의 관속식물)

  • Shin, Jae-Kwon;Byun, Jun-Gi;Kim, Ju-Yeong;Choi, Seung-ho;Kim, Dong-Kap
    • Proceedings of the Plant Resources Society of Korea Conference
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    • 2018.04a
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    • pp.48-48
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    • 2018
  • 본 연구는 우리나라 산림습원의 식물종 다양성을 보존하기 위한 일환으로 충북지역 산림습원 34개소에 분포하는 관속식물 현황을 파악하고자 수행하였다. 현지조사는 2017년 4월부터 10월까지 7개월 동안 수행하였다. 조사 결과 충북지역 산림습원에 분포하는 관속식물은 총 98과 312속 502종 5아종 71변종 587분류군으로 충북지역 전체 식물상 약 1,241분류군의(국립수목원 한국관속식물분포도, 2016) 47.3%로 나타났다. 습지에 출현하는 빈도에(수생태사업단 우리나라습지생태계 관속식물의 유형분류, 2012) 따라 구분한 결과 절대습지식물은 물꽈리아재비, 큰고양이수염, 통발, 벗풀, 올챙이고랭이, 택사 등 27분류군, 임의습지식물은 버드나무, 쉽싸리, 물억새, 이삭사초, 부처꽃, 비녀골풀, 솔발울고랭이, 양뿔사초, 진퍼리새 등 51분류군이다. 또한 습원과 육지에서 동시 출현하는 양생식물은 모시물통이, 왕미꾸리광이, 물양지꽃, 좀고추나물, 감자개발나물, 참삿갓사초 등 29분류군, 임의육상식물은 쇠뜨기, 고비, 고추나물, 방동사니, 강계큰물통이, 오리새, 처녀바디 등 25분류군, 절대육상식물은 애기탑꽃, 좀진고사리, 옥잠난초, 물들메나무, 뻐국나리, 진범, 범꼬리 등 88분류군으로 확인되었다. 특히 절대습지식물 중 애기물꽈리아재비, 큰고양이수염, 개쉽싸리, 통발, 송이고랭이, 올방개아재비, 흰고양이수염 등 11분류군은 충북내에서 새롭게 분포가 확인되었다. 산림청 지정 희귀식물은 양뿔사초(CR), 애기물꽈리아재비(VU), 통발(VU) 등 16분류군, 한국특산식물은 키버들, 강계큰물통이, 물들메나무, 넓은잎각시붓꽃 등 19분류군이다. 식물구계학적 특정식물로는 V등급 통발 등 3분류군, IV등급 왜방풍 등 9분류군, III등급 음양고비 등 18분류군, II등급 12분류군, I등급 30분류군이 확인되었다. 외래식물은 큰닭의덩굴, 미국자리공, 붉은서나물 등 27분류군으로 나타났다.

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Diversity of Moojechineup's flora (무제치늪 식물상의 다양성)

  • Park, Seongjun;An, Bo-Ram;Jang, Soon-Young;Park, SeonJoo
    • Korean Journal of Plant Taxonomy
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    • v.41 no.4
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    • pp.370-382
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    • 2011
  • We investigated the area around four moors from May 2009 to June 2010 for plant diversity in Moojechineup, officially designated as the Ramsar wetland. The vascular plants of Moojechineup at Mt. Jeongjok were recorded as total 149 taxa, 55 families, 105 genera, 128 species, 1 subspecies, 16 varieties, and 4 forms. Rare plants were observed 7 taxa (Eriophorum gracile Koch, Drosera rotundifolia L., Iris ensata var. spontanea (Makino) Nakai, Kobresia bellardii (All.) Degl, Utricularia bifida L., Utricularia racemosa Wall., Utricularia yakusimensis Masam.). Korean endemic plants were 1 taxon, floristics special plants were 19 taxa, and naturalized plants were 3 taxa. Phytogeographical and evolutionarily, Eriophorum gracile is an important species; hence, further studies are needed to conserve it. Moojechineup is similar to the Shinbulsan wetland in terms of wetland plants (hydrophytes). Moojechineup's flora changes are in process slowly compared to earlier work; thus, continuing interest and appropriate measures should be encouraged.

The Change Analysis of Plant Diversity in Protected Horticulture of Agricultural Ecosystems (시설원예단지 조성이 농업생태계의 식생다양성에 미치는 영향 분석)

  • Son, Jin-Kwan;Kong, Min-Jae;Kang, Dong-Hyeon;Park, Min-Jung;Yun, Sung-Wook;Lee, Si-Young
    • Journal of Wetlands Research
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    • v.18 no.2
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    • pp.173-182
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    • 2016
  • Although the ecosystem extends numerous functions for the benefit of humankind, construction of horticultural facilities can potentially lead to the degeneration of some of these functions owing to the expansion of impervious regions and loss of habitats. Thus, this study aimed to examine the effect of construction of horticultural facilities on plant biodiversity. Analysis of the vegetation distribution characteristics showed that horticultural facilities had significantly lower plant diversity than did rice paddies. Hence, the proposed approach involved low-impact development, arrangement of habitat space, plant preservation, restricted use of chemical fertilizer, habitat creation, and reduced preservation cost. Lifestyle analysis suggested the importance of developing favorable environments for the growth of annual plants and aquatic plants. In all, 20 species of naturalized plants belonging to 10 families were identified. Furthermore, the proportion of these naturalized plants was higher in glass greenhouses and multi-span greenhouses, suggesting the advantages of employing natural soil mulching while avoiding concrete mulching. Statistical analysis was performed to validate the results, which suggested that impervious regions be converted to natural soils. Collectively, the findings of this study are expected to be used for establishing policies for the construction of eco-friendly and ecological horticultural facilities; this may aid the maintenance of sustainable agricultural landscapes and large-scale development of the reclaimed lands.