Journal of Environmental Impact Assessment (환경영향평가)

Korean Society of Environmental Impact Assessment (한국환경영향평가학회)
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Vegetation Classification and Distributional Pattern in Damyang Riverine Wetland

담양하천습지의 식생유형과 분포양상

  • Received : 2016.02.12
  • Accepted : 2016.03.23
  • Published : 2016.04.30
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Abstract

Damyang riverine wetland was designated as a wetland protected area in 2004; that is located in the Yeongsan river mainstream. Total 30 phytosociological releves at field studies were classified with 22 vegetation types including of 101 species (unidentified 1 species). Legends of actual vegetation map were separated by 6 types; riparian forest, substitute vegetation, synanthropic vegetation, wet meadow vegetation, open water, an area of wetland vegetation is about 35 % ($386,841.86m^2$). Results of this study area as follows. The plant society of Damyang riverine wetland was conjectured that it was formed by rapidly water environment change with installed weir on the upstream of protected area and operating of Damyang dam on top of the basin. Until recently, the terrace land on the river was used to cultivate, but that would be formed fallow vegetation scenery on riverfront caused by no cultivation after designated protected area. Paspalum distichum var. indutum community designated as invasive alien plant by Korea Ministry of Environment was widely developed and Myriophyllum spicatumunrecorded in the country as newly alien species was discovered in the study zone. The plants as lapped over developing environment for Leersia japonica must be occupied habitat of native plant species having similar niche. The various plant society in Damyang riverine wetland should be developed because of environmental changes, disturbances and damages of stream.

담양하천습지는 영산강 본류에 위치하는 하천습지로서 2004년 습지보호지역으로 지정되었다. 이번 연구에서는 총 30개의 식생자료가 획득되었으며, 총 101종(미동정종 1종)을 포함하는 22개의 식생유형이 구분되었다. 현존식생도는 6개의 범례(하천림, 대상식생, 터주식생, 연안대식생, 습생초원, 개방수역)로 구분되었으며, 습지식생의 면적은 약 35%($386,841.86m^2$)를 차지하였다. 본 연구 결과 담양하천습지에 분포하는 식물사회는 보호지역 상단에 설치된 물막이보와 상부 유역에 운영 중인 담양댐 등으로 인해 급격한 수환경 변화로 형성된 것으로 유추되었다. 고수부지는 최근까지 경작이 진행되었으나 보호지역 지정 이후 방치됨으로써 현재와 같은 하천변 휴경작지의 식생경관이 형성되었다. 조사지역 내 환경부 지정생태계 교란 야생식물인 털물참피가 우점하는 군락이 넓게 발달하고 있으며, 국내 미기재된 새로운 귀화식물군락인 앵무새깃군락이 관찰되었다. 이들 식물군락들은 나도겨풀군락이 발달하는 환경과 중복되어 그 밖의 유사한 생태적 지위를 가지는 고유식물군락의 서식처를 점유하게 될 것이다. 담양하천습지의 다양한 식물사회들은 인공 시설물 등에 의한 하천환경 변화 및 교란, 훼손에 기인한 것으로 이해된다.

Keywords

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