• Title/Summary/Keyword: 서식조건

Search Result 384, Processing Time 0.025 seconds

The Value and Growing Characteristics of the Dicentra Spectabilis Community in Daea-ri, Wanju-gun, Jeollabuk-do as a Nature Reserve (전북 완주군 대아리 금낭화 Dicentra spectabilis 군락지의 천연보호구역적 가치와 생육특성)

  • Lee, Suk Woo;Rho, Jae Hyun;Oh, Hyun Kyung
    • Korean Journal of Heritage: History & Science
    • /
    • v.44 no.1
    • /
    • pp.72-105
    • /
    • 2011
  • This study explores the value of the Dicentra spectabilis community as a nature reserve in provincial forests at San 1-2, Daea-ri, Dongsang-myeon, Wanju-gun, Jellabuk-do, also known as Gamakgol, while defining the appropriateness of its living environment and eventually providing basic information to protect this area. For these reasons, we investigated 'morphological and biological features of Dicentra spectabilis' and the 'present situation and problems of designing a herbaceous nature reserve in Korea.' Furthermore, we researched and analyzed the solar, soil and vegetation condition here through a field study in order to comprehend its nature reserve value. The result is as follows. According to the analytic result for information on the domestic wild Dicentra spectabilis community, it is evenly spread throughout mountainous areas, and there is one particularly outstanding in size in Wanju Gamakgol. Upon the findings from literature and the field study about its dispersion, Gamakgol has been discovered as an ideal district for Dicentra spectabilis since it meets all the conditions this plant requires to grow vigorously, such as a quasi-high altitude and rich precipitation during its period of active growth duration in May. Dicentra spectabilis grows in rocky soil ranging from 300~375m above sea level, 344.5m on average, towards the north, northwest and dominantly in the northeast. The mean inclination degree is $19.5^{\circ}$. Also, upon findings from analyzing solar conditions, the average light intensity during its growth duration, from Apr. to Aug., is 30,810lux on average and it tends to increase, as it gets closer to the end. This plant requires around 14,000~18,000lux while growing, but once bloomed, fruits develop regardless of the degree of brightness. The soil pH has shown a slight difference between the topsoil, at 5.2~6.1, and subsoil, at 5.2~6.2. Its mean pH is 5.54 for topsoil and 5.58 for subsoil. These results are very typical for Dicentra spectabilis to grow in, and other comparative areas also present similar conditions. Given the facts, the character of the soil in Gamakgol has been evaluated to have high stability. Analysis of its vegetation environment shows a wide variation of taxa numbering from 13 to 52 depending on area. The total number of taxa is 126 and they are a homogenous group while showing a variety of species as well. The Dicentra spectabilis community in the Daea-ri Arboretum is an herbaceous community consisting of dominantly Dicentra spectabilis, Cardamine leucantha, Boehmeria tricuspi and Impatiens textori while having many differential species such as Impatiens textori, Pueraria thunbergiana, Rubus crataegifolius vs Staphylea bumalda, Securinega suffruticosa, and Actinidia polygama. It suggests that it is a typical subcolony divided by topographic features and soil humidity. Considering the above results on a comprehensive level, this area is an excellent habitat for wild Dicentra spectabilis providing beautiful viewing enjoyment. Additionally, it is the largest wild colony of Dicentra spectabilis in Korea whose climate, topography, soil conditions and vegetation environment can secure sustainability as a wild habitat of Dicentra spectabilis. Therefore, We have determined that the Gamakgol community should be re-examined as natural asset owing to its established habitat conditions and sustainability.

Habitat Environment, Age and Feeding Ecology of the Endangered Species, Gobiobotia macrocephala (Pisces: Cyprinidae) in the Seom River, Korea (멸종위기 어류 꾸구리 Gobiobotia macrocephala (Pisces: Cyprinidae)의 서식환경과 연령, 섭식생태)

  • Ko, Myeong-Hun;Song, Ha-Yoon;Bang, In-Chul
    • Korean Journal of Ichthyology
    • /
    • v.23 no.4
    • /
    • pp.278-287
    • /
    • 2011
  • Habitat environment, age and feeding ecology of Gobiobotia macrocephala were investigated to provide baseline data for ecological characteristics and recovery in the Seom River at Heungho- ri, Buron-myeon, Wonju-si, Gangwon-do, Korea from 2010 to 2011. G. macrocephala inhabited 10~40 cm in water depth, 8~20 cm bottom size and 40~120 cm/sec in current velocity, and pebble floor were factors to be important for inhabit density. Age group of G. macrocephala in May estimated from the standard length indicated that the 28~42 mm group is 1 year old, the 43~58 mm group is 2 years old, the 59~69 mm group is 3 years old and the 69~85 mm group is more than 4 years old, and the female was 4~10 mm larger than the male. G. macrocephala did mainly feeding with nocturnal fishes between 00 h to 06 h, and they fed mainly Trichoptera (57.7%), Diptera (26.0%) and Ephemeroptera (16.3%). And their small juvenile fed mainly Ephemeroptera and Diptera, however, they ate mainly Trichoptera while growing to adult fish.

Amphibian Fauna in the Mt. Myungji (명지산 일대의 양서류)

  • 계명찬
    • Korean Journal of Environmental Biology
    • /
    • v.21 no.2
    • /
    • pp.203-207
    • /
    • 2003
  • Amphibian biodiversity, community structure and habitats were surveyed in the Mt. Myungji area from April 2002 to March 2003. During the survey period 2orders, 4 families, 7 species of amphibians were observed. Bombina orientalis (DI =45.1%) was dominant and Bufo stejnegeri (DI = 12.8%), Rana rugosa and Rana dybowskii (DI = 9.9% each) Rana nigromaculata and Rana huanrenensis (DI 1.4% each), and Onycodactylus fisheri (DI = 7.0%) followed. Frequency of occurrence of O. fisheri and B. stejnegeri was largely different according to the altitude and human residence in their habitats.R. nigromaculata and R. huanrenensis showed low frequency of occurrence (<10%) suggesting the decrease in habitation density in this area. The species richness (R'), general diversity (H'), and evenness (E') of amphibians in this area were 0.98, 2.12, and 0.76, respectively, suggesting relatively healthy condition of amphibian community in this area.

A Study on Underwater Acoustic Characteristics by Vegetation in River (하천 식생에 따른 수중음향 분석)

  • Gu, Jung-Eun;Jung, Sang Hwa;Kang, Joongu
    • Proceedings of the Korea Water Resources Association Conference
    • /
    • 2017.05a
    • /
    • pp.522-522
    • /
    • 2017
  • 하천에서 식생은 하도내 흐름저항과 항력을 증가시켜 유속과 유사이동을 감소시킨다. 유속의 감소로 인해 유사가 퇴적되어 사주 발생이 증가하며 이는 하도 지형변화의 중요한 요인이 된다. 하천내 식생은 하천생물의 서식과 밀접한 관련이 있는 물리적인 서식환경을 변화시키게 된다. 이러한 물리적인 서식환경 변화는 수중음향으로 표현되는 하천의 음환경(Soundscape) 변화로 연결된다. 본 연구는 하천 식생대에서의 수중 음향변화를 식생유무, 수온, 수심에 따라 분석하고 수리학적 특성과의 상관관계를 파악하고자 한다. 실규모 하천 수로에 식생 38 주/$m^2$를 식재하고 1 m정도 성장시킨 후 식생을 완전 침수시켜 $3.2m^3/s$의 유량을 공급하여 유속의 변화와 수중음향을 측정하였다. 오후시간대와 새벽시간대를 이용하여 수온이 다른 조건에서 측정하였고, 수심은 표면 3 cm, 40 cm, 80 cm 깊이에서 각각 측정하였다. 측정지점은 식생구간의 상류지점(A), 식생구간(B), 식생구간의 하류지점(C) 세 곳을 선정하였고, 유속은 micro-ADV, 수중 음향은 Hydrophone을 사용하여 5분간 측정하였다. 측정 주파수 spectrum은 1/3 Octave band로 처리하여 음압을 비교분석하였다. 주파수에 따른 음압을 분석한 결과 측정지점에 관계없이 주로 125 Hz, 315 Hz에서 높게 나타났다. 수심에 따른 음향을 분석한 결과 식생이 없는 상류(A)지점에서는 수중음향의 차이가 크게 나타났으며, 식생지점(B)과 식생이 없는 하류(C)지점에서는 수중음향이 유사하게 나타났다. 이는 식생에 의한 유속의 저하로 인해 흐름이 안정화되어 나타나는 현상으로 판단된다. 수온에 따라서는 식생구간(B)과 하류(C)지점에서 대체로 큰 차이를 보이지 않았으나 상류(A)지점에서는 수온이 높을 때 음압이 더 크게 나타났다. 이는 온도가 높을수록 소리의 전달속도가 더 빨라지기 때문으로 판단된다. 이처럼 식생의 유무와 수심, 온도에 따라 하천의 수리학적 특성이 달라지고 이에 따른 수중음향도 달라지므로 하천의 물리적 서식환경을 평가하기 위한 인자로 수중음향을 활용할 수 있을 것으로 사료된다.

  • PDF

Estimation of Habitats Suitability Index based on Hydraulic Conditions (수리조건을 이용한 생물서식처 적합도 지수 산정 -홍천강을 대상으로-)

  • Lee, Jae-Yil;Lee, Gyu-Sung;Ahn, Hong-Kyu;Ha, Sung-Ryong
    • Journal of Wetlands Research
    • /
    • v.13 no.1
    • /
    • pp.149-160
    • /
    • 2011
  • This study developed a HSI for the creatures in Hongcheon River in order to analyze the conditions proper for habitats. For the index, the investigator identified a total of seven items encompassing hydraulic characteristics such as flow velocity and water depth, and water quality characteristics such as water temperature, BOD, DO, TN, and TP. The subject river was simulated, inspected, and revised with a two-dimensional river model (RMA-2) and water quality model (QUAL2E). Using GIS, the developed index was divided by section by reflecting river characteristics and compared and analyzed with the statistics. The river was divided into a total of 29 reaches by reflecting the basic characteristics and the features of the hydraulic coefficient on the cross-sections of the river. According to the analysis results, the fish scored the highest mean of the overall habitat suitability index of 0.769 at reach 27. Each of the variables had the following mean values: 0.122 m/s for flow velocity, 0.782m for water depth, $14.3^{\circ}C$ for water temperature, 0.68 mg/l for BOD, 10.3 mg/l for DO, 2.4 mg/l for TN, and 0.0121mg/l for TP.

The Estimation of Ecological Flow Recommendations for Fish Habitat (하천의 어류 서식환경을 고려한 생태학적 추천유량 산정)

  • Sung, Young-Du;Park, Bong-Jin;Joo, Gea-Jae;Jung, Kwan-Sue
    • Journal of Korea Water Resources Association
    • /
    • v.38 no.7 s.156
    • /
    • pp.545-554
    • /
    • 2005
  • The detailed interdisciplinary surveys were conducted on the pattern of habitat use of dominant fishes during the spawning and adult stage. The hydraulic parameters of the depth and velocity, discharge, substrate cover streams, and distribution of fish in the Yeonggang, WiCheon, HoeCheon, GeochangwiCheon, CheongdoCheon, DanjangCheon (the Nakdong River Basin) were measured. The Habitat Suitability Criteria was developed for the two fish species (Zacco Platypus and Zacco Temmincki) and life stages(spawning and adult), habitat conditions (depth, velocity and covet). The Physical Habitat Simulation of the Instream Flow Incremental Methodology was applied to calculate for optimal flow and the ecological flow recommendation was proposed by choosing the largest one in the optimal flow. The ecological flow recommendation was $5.0\;m^3/s{\sim}10.0\;m^3/s$ (e.g., $6.5\;m^3/s$ in the NaeseongCheon). Also, the ecological flow recommendations were compared with the existing ecological flow and flow duration analysis.

A Study on the Habitait Suitability Considering Survival, Growth, Environment for Ruditapes philippinarum in Geunso Bay (Pado and Beopsan) (근소만 갯벌어장 내 바지락의 생존, 성장, 환경을 고려한 서식 적합성 연구)

  • Choi, Yong-Hyeon;Choi, Yoon-Seok;Cho, Yoon-Sik;Kim, Young-Tae;Jeon, Seung-Ryul
    • Journal of the Korean Society of Marine Environment & Safety
    • /
    • v.22 no.6
    • /
    • pp.723-730
    • /
    • 2016
  • Domestic Manila clam production has been reduced due to coastline changes and environmental degradation, but aquaculture industry is facing difficulties caused by an increase in imports. It is important to recognize the integral habitat environment in order to do sustainable aquaculture. The habitat environment of Manila clams (Ruditapes philippinarum) is closely related to the productivity of aquaculture farms. This study investigated 3 indexes, survival (sediment type, hydrodynamic), growth (Chlorophyll a, DIN, DIP) and environment (water temperature, dissolved oxygen, sediment chemical oxygen demand, ignition loss) as indicators of habitat characteristics for a tidal flat farm in Geunso Bay (Pado and Beopsan) from June 2015 to May 2016. As a result, Pado (maximums.; sand 48.76 %, hydrodynamic 10.59 cm/s, Chlorophyll a 12.70 ug/L, exposure time 3 hours, DO 18.65 mg/L) had a higher sand content, faster current speed, more abundant nutrients and DO, providing more favorable conditions for Manila clams than Beopsan (maximums.; sand 37.40 %, hydrodynamic 6.02 cm/s, Chlorophyll a 6.41 ug/L, exposure time 7 hour, DO 14.81 mg/L). In fact, Pado showed a higher density than Beopsan. This study considered the habitat environments of Pado and Beopsan to provide a basis for optimal management practices and potential suitable sites in Geunso bay.

Analysis of Habitat Conditions by Tree Density and Discharge in the Geum River (수목밀도와 유량에 따른 금강의 물리서식처 변화 분석)

  • Mikyoung Choi;Taeun Kang;Changlae Jang
    • Ecology and Resilient Infrastructure
    • /
    • v.10 no.4
    • /
    • pp.250-257
    • /
    • 2023
  • Tree in river have environmental functions such as ecosystem preservation and flood control functions that protect the riverbank. On the other hand, excessive tree development can have the negative effect of fixing the sand bar and reducing the cross-sectional area. Nays2D simulation results performing two flow conditions (average dam operation discharge and two-year frequency discharge) and four tree density conditions (current, zero, low, high tree density) used as input data for PHABSIM to calculate WUA (Weighted Usable Area). The results show that riverbed changes occur more significantly in the zero tree density than presence of trees, which could have a positive impact on the biological habitat environment of Zacco platypus.

Flow Analysis around inclined Crest Groyne for 3-D Numerical Simulation (수리 및 3차원 수치모형을 이용한 경사형 수제주변 흐름해석)

  • Yeo, Hong-Koo;Kang, Joon-Gu;Kim, Sung-Jung
    • Proceedings of the Korea Water Resources Association Conference
    • /
    • 2007.05a
    • /
    • pp.1229-1233
    • /
    • 2007
  • 국내에서의 수제는 하안 및 제방의 보호, 유로제어 및 주운 등의 목적에 의해 설치되기 보다는 수제로 인해 발생되는 수제역(recirculation zone)의 다양한 흐름이 수중생물의 다양한 서식처 및 홍수 시 어류의 피난처 제공한다는 환경적인 목적이 지배적이다. 따라서 홍수시 하천의 통수능 감소영향이 상대적으로 작고 국부세굴에 대해 안정적인 경사형 수제에 대한 관심이 크며 몇몇 곳에서는 시공되어 졌다. 하지만 경사수제에 대한 설계기법은 현재 미미한 상태이며 선행되어져야할 구조물 주변의 흐름해석에 관한 연구도 미미하다. 이에 본 연구에서는 3차원 수치모형을 적용하여 주수로와 수제역의 흐름해석을 수행하였다. 연구내용은 수리모형변화와 수치모형실험을 병행하여 수행하여 수치모형결과를 검증하였으며 그 결과를 적용하여 경사형 수제주변의 흐름을 해석하였다. 수치모형은 Flow 3D모형을 이용하여 경사형 수제조건에 따른 흐름해석을 수행하였고 수리모형실험은 수치모형과 동일한 2가지 조건에 대해 수행하여 수치모형결과와 비교 분석 하였다. 본 연구의 목적은 경사형 수제설치로 변화되는 수제역 흐름을 3D 수치해석으로 분석하여 수제역의 환경적 효과(수중생물의 서식처 등)에 대한 기초자료를 제공하는 것이다. 연구결과, 수치모형실험은 수리모형결과와 일치하였으며 경사형 수제특성에 따라 수심별 흐름변화를 분석할 수 있었으며 기존 불투과 및 투과수제와 다른 결과를 도출하였다.

  • PDF

Experimental Design for Damage and Recovery of Benthic Macroinvertebrate Communities (저서성 대형무척추동물 군집의 피해 및 회복 규명을 위한 수리실험 계획)

  • Jeong, Soon-Hyuk;Kim, Jin-Hong
    • Proceedings of the Korea Water Resources Association Conference
    • /
    • 2009.05a
    • /
    • pp.2122-2126
    • /
    • 2009
  • 최근 나날이 강도를 더해가는 이상기후로 인하여 집중 호우의 빈발과 홍수피해가 급증함으로써 하천생태계의 서식처가 파괴되고 저서성 대형무척추동물과 같은 생태구성원의 일시적인 소멸에 의해 하천생태계의 유지가 어려워지고 있다. 본 연구에서는 흐름의 소류력에 따른 저서성 대형무척추동물 군집의 피해 및 회복 양상을 규명하기 위한 수리실험을 계획하였다. 실험수로는 400(W)${\times}$400(H)${\times}$12000(L)mm의 직사각형 단면이며, 철제틀과 투명유리로 되어있다. 실험수로는 유기물질을 제거한 cobble과 pebble로 하상을 구성하였으며, 다양한 유속의 변화에 따른 하상구성 파괴를 막기 위해 투명 플라스틱망을 이용하였다. 또한 빛에 의한 이상행동을 고려하여 직접적인 햇볕을 차단하고 자연하천과 유사한 실험 조건을 위해 인근 안성천의 원수를 이용하였다. 실험 대상종은 붙는 무리의 대표적인 동물인 두점하루살이와, 헤엄치는 무리의 두갈래하루살이를 이용하였고, 서식무리별 선호유속 및 한계유속과 피해유속을 규명하고자 계획하였다. 이와 같은 실험수로 조성의 실험 기법은 향후 인공하천 및 복원하천 조성 시 서식처 개선에 대한 생태학적 복원자료로 활용할 수 있다.

  • PDF