Korean Journal of Environment and Ecology (한국환경생태학회지)

Korean Society of Environment and Ecology (한국환경생태학회)
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Distribution Patterns of Hydrophytes by Water Depth Distribution in Mokpo of Upo Wetland

우포늪 목포습지 수심 분포에 따른 수생식물의 분포 특성

  • Received : 2016.02.15
  • Accepted : 2016.04.25
  • Published : 2016.06.30
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Abstract

The purpose of this study is to identify distribution patterns of hydrophytes in the Mokpo wetland in relation to the depth of water. Sample surveys were conducted based on plant species distribution status and water depths at 274 spots. This study also developed a detailed depth distribution map for Mokpo wetland, which was never done in any previous studies. Through this study, it was found that the average depth of the wetland was 77cm (${\pm}29cm$) and the maximal depth was 157cm. The outer edge was no deeper than 60cm and the center approximately 120~130cm in depth, forming a concave bowl-like shape. This research confirmed inhabitation of 6 types of submerged plants (Verticillate hydrilla, Vallisneria natans, Najas graminea, Potamogeton cripus, Ceratophyllum demersum, and Potamogeton brechtoldi), and three types of floating leaved plants (Euryale ferox, Hydrocharis dubia and Trapa japonica) in the surveyed areas of the wetland. The distribution of these hydrophytes showed a statistically significant difference (${\chi}^2=982.2$, df = 8, p < 0.01), which confirms the fact that distribution varies based on environmental conditions. The most frequently observed species was Trapa japonicas at 244 times, and it showed a distribution pattern by which coverage increased with greater depth, as was also seen in the case of Potamogeton cripus. Five species-Euryale ferox, Hydrocharis dubid, Verticillate hydrilla, Najas graminea, and Ceratophyllum demersum-showed a negative correlation to depth, by which coverage decreased with increasing depth. It has been shown that fundamentally, the distribution of hydrophytes based on depth is affected by ecological factors, but also reflects the environmental properties of Mokpo wetland.

우포늪의 목포습지에서 수심에 따른 수생식물의 분포 특성을 밝히기 위한 연구가 수행되었다. 274개 지점에서의 수심 및 식물종 분포 현황에 대한 표본조사가 이루어졌다. 선행연구에서 이루어진바 없었던 목포에 대한 상세한 수심분포 지도가 만들어졌다. 평균 수심은 77cm(${\pm}29cm$), 최대 수심은 157cm로서 가장자리는 60cm이내이며, 중심부가 120-130cm 정도의 오목한 그릇 형태를 이루고 있는 것으로 나타났다. 본 연구를 통해 침수식물 6종(검정말, 나사말, 나자스말, 말즘, 붕어마름, 실말)과 부엽식물 3종(가시연꽃, 자라풀, 마름)의 서식이 확인 되었다. 이들 수생식물들의 분포는 통계적으로 유의한 차이(${\chi}^2=982.2$, df = 8, p< 0.01)를 보여 환경조건에 따라 식물종의 분포 양상이 다른 것으로 확인되었다. 마름이 244회 출현하여 가장 높은 빈도로 출현하는 것으로 나타났으며, 말즘과 함께 수심이 깊을수록 피도가 높아지는 분포 양상을 보였다. 가시연꽃, 자라풀, 검정말, 나자스말, 붕어마름 5종은 수심이 깊을수록 피도가 낮아지는 음의 상관관계를 나타내었다. 수심에 따른 수생식물의 분포는 근본적으로 각각의 식물종이 가지는 생태적 특성에 의한 것이지만, 목포습지의 환경 특성을 반영하고 있는 것으로 나타났다.

Keywords

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