• 제목/요약/키워드: Tidal freshwater marshes

검색결과 4건 처리시간 0.019초

Distribution of Heavy Metals in Soils of Shihwa Tidal Freshwater Marshes

  • Yun, Seok-In;Choi, Woo-Jung;Choi, Young-Dae;Lee, Seung-Heon;Yoo, Sun-Ho;Lee, Eun-Ju-;Ro, Hee-Myong
    • The Korean Journal of Ecology
    • /
    • 제26권2호
    • /
    • pp.65-70
    • /
    • 2003
  • Shihwa tidal freshwater marsh was constructed recently to treat pollutants entering Shihwa lake. In this study, we examined the spatial and temporal patterns of heavy metal accumulation in soils of Shihwa marsh and sought correlations between several soil variables (pH, electrical conductivity, organic matter, and acid ammonium oxalate-extractable Fe and Al contents) and the heavy metal concentration of soils. Surface soil samples (0∼20 cm) were collected in June 2000, November 2000, and July 2001, and were analyzed for heavy metals (Zn, Cd, Pb, Cu, Cr, As, and Hg) and soil chemical properties. The neutral pH and water-saturated conditions of Shihwa marsh appeared to favor immobilization of heavy metal through adsorption onto soils. The concentrations of heavy metal (especially Zn, Cu, and Cr) in soils of Shihwa marsh increased along the sampling occasions, suggesting that soils of Shihwa marsh serve as a sink of heavy metal. Among the sub-marshes, metal concentrations were highest in Banweol high marshes and lowest in Samhwa marshes. The temporal and spatial variations in the heavy metal concentrations of soils were correlated positively with organic matter and oxalate extractable Fe and Al contents, but negatively with electrical conductivity. These results suggest that organic matter and hydrous oxide of Fe/Al may playa key role in removing heavy metals in soils of Shihwa marsh, and that heavy metal removing capacity would increase with desalinization. However, the removal patterns of heavy metal by reeds warrant further studies to evaluate the total removal capacity of heavy metals by Shihwa marsh.

시화지구 인공습지에서 갈대에 의한 질소 및 인 흡수 (Uptake Patterns of N and P by Reeds (Phragmites australis) of Newly Constructed Shihwa Tidal Freshwater Marshes)

  • 노희명;최우정;이은주;윤석인;최영대
    • The Korean Journal of Ecology
    • /
    • 제25권5호
    • /
    • pp.359-364
    • /
    • 2002
  • 시화지구 인공습지에 식재된 정수식물인 갈대(Phragmites australis)의 관리 방안을 모색하기 위해 갈대에 의한 질소 및 인 흡수 제거 양상과 갈대 생장과 관련된 토양 특성을 조사하였다. 습지 조성 초기에 갈대의 생장은 토양 염농도에 의해 저해된 것으로 나타났으며, 토양 유기물 함량은 갈대 비생육기 동안 고사체의 집적에 의해 증가하였지만, 서서히 분해되어 감소한 것으로 조사되었다. 갈대의 건물중과 질소 및 인 흡수량은 생장기인 여름과 가을에는 증가하였지만, 비생육기인 가을에는 감소하였다. 따라서 생장기 동안 갈대의 흡수에 의해 상당한 양의 질소와 인이 제거되었지만, 비생장기 동안 갈대 고사체의 형태로 토양에 환원되어 미생물의 분해에 의해 영양염류가 재방출될 가능성이 높은 것으로 판단되었다. 본 연구 결과에 의하면 인공습지 조성의 목적인 수질 정화와 생태공원으로서의 기능을 위해서는 갈대를 생육기간 중에 수확하는 방안을 적극적으로 모색해야 될 필요성이 있다.

Spatial distribution of halophytes and environment factors in salt marshes along the eastern Yellow Sea

  • Chung, Jaesang;Kim, Jae Hyun;Lee, Eun Ju
    • Journal of Ecology and Environment
    • /
    • 제45권4호
    • /
    • pp.264-276
    • /
    • 2021
  • Background: Salt marshes provide a variety of ecosystem services; however, they are vulnerable to human activity, water level fluctuations, and climate change. Analyses of the relationships between plant communities and environmental conditions in salt marshes are expected to provide useful information for the prediction of changes during climate change. In this study, relationships between the current vegetation structure and environmental factors were evaluated in the tidal flat at the southern tip of Ganghwa, Korea, where salt marshes are well-developed. Results: The vegetation structure in Ganghwa salt marshes was divided into three groups by cluster analysis: group A, dominated by Phragmites communis; group B, dominated by Suaeda japonica; and group C, dominated by other taxa. As determined by PERMANOVA, the groups showed significant differences with respect to altitude, soil moisture, soil organic matter, salinity, sand, clay, and silt ratios. A canonical correspondence analysis based on the percent cover of each species in the quadrats showed that the proportion of sand increased as the altitude increased and S. japonica appeared in soil with a relatively high silt proportion, while P. communis was distributed in soil with low salinity. Conclusions: The distributions of three halophyte groups differed depending on the altitude, soil moisture, salinity, and soil organic matter, sand, silt, and clay contents. Pioneer species, such as S. japonica, appeared in soil with a relatively high silt content. The P. communis community survived under a wider range of soil textures than previously reported in the literature; the species was distributed in soils with relatively low salinity, with a range expansion toward the sea in areas with freshwater influx. The observed spatial distribution patterns may provide a basis for conservation under declining salt marshes.

사천 곤양천하구습지의 생태적 특성과 관리방안 (Ecological Characteristics and Management Plan of the Gonyangcheon Estuarine Wetland, Sacheon, South Korea)

  • 김평범;임정철;장연희;추연수
    • Ecology and Resilient Infrastructure
    • /
    • 제11권3호
    • /
    • pp.78-89
    • /
    • 2024
  • 하구역은 담수와 해수가 섞여 염분 농도와 퇴적물 변화 양상이 특이한 환경 조건을 제공하며, 이와 같은 환경 조건은 타 생태계에서 볼 수 없는 생물다양성을 보유하게 된다. 본 연구는 기수역인 곤양천하구습지를 대상으로 식생의 분포 특성과 생물상을 조사·분석하여, 하구습지의 보전 및 지속가능한 이용을 위한 기초자료를 마련하려는 목적으로 수행되었다. 정수 및 유수역 다년생 초본식생, 염습지식생, 경작지식생, 대상식생 등 총 6개 상관식생형의 25개 식물군락으로 분류되었다. 특히, 하류부에 넓게 분포하는 갯잔디군락이 전형적인 만조 염습지의 특성을 나타내며, 이로 인해 보전 가치가 더욱 높아지고 있습니다. 생물다양성 측면에서는 2012년에 비해 53종이 증가하여 총 1,067종의 생물이 확인되었으며, 멸종위기 야생생물은 15종이 확인되었다. 열린 하구로서 생태적 연결성이 우수하며, 논, 산림, 염습지 등 다양한 지형과 경관이 유기적으로 발달 및 분포하여 기수성 생물 포함 생물다양성 증진에 긍정적으로 역할을 하고 있었다. 따라서 곤양천하구습지의 체계적 보전은 연안까지 연결되는 습지 생태축을 확보하여 생물의 이동 경로를 보호하고 생태적 안정성을 증진시키는 데 기여할 것이다.