간척지에서 식생의 분포에 대한 평가는 토양관리 및 환경적 연구를 위해 필요하다. 본 연구는 한국 중부 서해안 경기만 내의 3개 간척지에서 식생의 분포와 토양 염농도 간의 관계를 규명하기 위하여 실시하였다. 식생이 연속분포를 보이는 지점에서 토양 염농도를 측정하고 출현식물종을 분류하여 연속분포의 특성을 기술하였다. 간척지 내에 나타나는 식생의 공간변이는 부분적으로 이루어지지만 각각의 공간변이를 토양 염농도를 기준으로 연결한 결과 토양 염농도 구배와 내염성 식물종의 분포가 일치하는 연속분포(continuum distribution)를 보여, 토양 염농도가 높은 곳은 내염성 식물종이, 낮은 곳은 비내염성 식물종이 분포하였다. 연속분포는 간척 경과 년 수가 오래된 곳에서 유형이 다양하고 명확하게 구분되나, 간척 초기 지역에서는 연속분포 현상이 뚜렷하지 않았다. 연속분포 유형은 순차적 유형과 비순차적 유형으로 구분되었다. 순차적 유형은 토양 염농도가 높은 곳을 기점으로 할 경우 토양 염농도가 연속적으로 낮아지는 방향으로 이어지며 식물종도 이에 따라 선구종 염생식물(pioneer halophyte)에서 저염생식물(facultative halophyte), 중성식물(glycophyte)의 순으로 변화하였다. 비순차적 유형은 비연속적 토양 염농도의 변화에 의해 형성되며, 식생의 분포도 단계적 변화를 보이지 않고 비정형적이다. 간척 경과 년 수가 오래된 지역에서는 토양 염농도가 높은 식생 고사지역이 있고 식생 비분포지와 함께 이 지점을 기점으로 식생의 연속분포가 형성되었다.
Assessing for flora distribution is necessary for land management and environmental research in reclaimed lands. This study was conducted to find out the relationship between vegetation distribution and soil salinity on three reclaimed tidal flats of Kyonggi-bay in the mid-west coast of Korea. We investigated the soil salinity and identified the vegetation at the continuum distribution spots, and describe the characteristics of continuum distribution. On the reclaimed tidal flats, spatial variation of vegetation formed partially, however as the result for connection of each spatial variation along with the soil salinity, continuum distribution formed and it was overlapped edaphic gradient with vegetation distribution, it means that the continuum distribution correspond with soil salinity gradient, as the evidence high salt tolerance species occurred at high saline spots, non salt tolerance species occurred at low saline spots. On the aged reclaimed tidal flats, continuum type was various and also clearly distinguished but it was not clear on the early stage of reclamation. The continuum distribution distinguished sequential and non-sequential type. Sequential type started from high saline zone and connected to low saline zone gradually, on this type, vegetation changed from pioneer halophyte to facultative halophyte and glycophyte along with the salinity gradient. Non-sequential type formed by non-sequential change of soil salinity, on this type, vegetation distribution was non-regular form because it has not changed gradually. In the aged reclaimed land, vegetation wilted zone existed with high salinity, and continuum distribution started from this zone with bare patch.
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