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Distribution Status of Paspalum distichum Community at the Nakdong-River Estuary

낙동강 하구언 일대의 물참새피군락 분포 현황

  • Received : 2017.01.31
  • Accepted : 2017.04.20
  • Published : 2017.06.30

Abstract

We described a spatial distribution pattern and floral diversity on the Paspalum distichum community occurring at the ecological parks of Hwamyeong, Daejeo, Samnak, and Maekdo in the Nakdong river estuary. A total distribution area of P. distichum community was $303,462.6m^2$. Its largest area was found in Samnak eco-park ($185,910.1m^2$). The most richness of knotgrass patches in each ecological park was determined Maekdo eco-park (87). Cover class level-5 shows the largest area ($260,663.2m^2$). A total of 73 taxa (34 families, 55 genus, 65 species, and 8 varieties) were listed up on the P. distichum community. A welldeveloped population of knotgrass was found predominantly at sites linked into human impacts at the riverine floodplain, the stream courses flowing through the parks, and the man-made channels and wetlands. Finally we proposed an ecological management strategy for knotgrass population in the study area.

낙동강 하구 일대의 생태공원에 분포하는 물참새피군락의 분포양상과 그 특성을 파악하였다. 연구결과 모든 생태공원에서 물참새피 단순우점군락이 넓은 면적으로 분포하고 있는 것으로 확인되었다. 생태공원 내 물참새피군락의 분포는 본류와 접한 구간을 제외한 대부분의 수변부에서 분포가 확인되었으며, 특히 연구지역 내 정수환경이 형성된 인공습지, 배후습지 및 배수로 일대에서 높은 빈도로 출현하였다. 대부분의 군락이 피도 4 또는 5의 단순우점군락을 형성하고 있었으며, 수변부 식생경관과 환경에 있어 다양한 변화를 가져온 것으로 확인되었다. 연구지역 내 물참새피군락 분포에 영향을 주는 요인들로 긍정적 요인(종 출현, 식생교란, 부영양화, 식토, 낚시행위)과 부정적 요인(물 흐름, 범람, 키 큰 식생, 수심, 사질토, 초식동물, 인위적 관리) 그리고 독립적 요인(염도, 토심, 경작, 생태관광)들이 파악되었다. 물참새피군락 내 출현식물의 다양성은 총 73 분류군이었으며, 다수의 자생식물이 물참새피와 경쟁관계를 형성하고 있는 것으로 확인되었다. 출현식물 중 귀화식물의 종다양성이 높아 물참새피군락의 서식처가 인위적 교란에 노출된 환경임을 확인할 수 있었다. 본 연구결과는 낙동강 하구 일대의 물참새피군락 관리를 위한 기초 정보로 활용될 수 있을 것으로 판단된다. 특히 물참새피 제거사업의 실행과정에서 드러난 각종 문제점(제거방법, 대상지 선정, 모니터링 방법 등) 해결에 본 연구결과가 낙동강 하구 일대의 생태계 관리에 도움을 줄 수 있기를 기대해본다.

Keywords

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