계방산 수변림 장기생태 연구지의 식물다양성 패턴 및 제어인자
Plant Diversity Patterns and the Drivers on a Long-Term Riparian Forest Research Site in Mt. Gyebang, South Korea
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초록
본 연구는 강원도 계방산 대한동계곡 내 위치한 수변림 장기생태 연구지를 대상으로 식물군집의 알파및 베타 종다양성과 제어인자를 분석하기 위해 수행되었다. 식생조사 결과, 수변림 조사구 내에서 총61과 126속 189종의 식물종이 관찰되었으며, 고란초과와 미나리아재비과에 속하는 종이 각각 15종으로가장 많았다. 식물다양성과 제어인자에 대한 분석 결과, 상층과 하층식생의 알파 다양성을 예측하는데가장 중요한 인자는 각각 경사도와 습윤도 지수였다. 베타 다양성은 조사구 간 거리와 환경인자의 비유사성이 모두 중요한 요인으로 나타났으나, 식물 개체가 속한 산림 층위에 따라 그 상대적 중요성은 달랐다. 즉, 상층식생의 경우 환경인자의 비유사성이 더 중요한 반면, 하층식생의 경우 조사구 간 거리가더 중요한 인자인 것으로 분석되었다. 본 연구는 계방산 수변림의 식물 다양성과 제어인자가 산림 층위에 따라 다르며, 이들 군집이 상층과 하층식생의 서로 다른 메커니즘에 의해 복합적으로 나타난 현상임을 제안한다.
Abstract
This study was carried out to investigate the patterns of alpha and beta species diversity and their drivers for plant communities on a long-term riparian forest research site in Mt. Gyebang, Gwangwon Province. A total of 189 plant species belonging to 61 families and 126 genera were recorded from field survey. Polypodiaceae and Ranunculaceae were the most frequently observed in 15 species respectively. As a results of analysis of diversity patterns and the drivers, the most important factor to predict alpha diversity of overstory and understory vegetation were slope and wetness index, respectively. Beta diversity was found to have significant relationships with both the distance between plots and environmental distance but the relative importance was different among forest strata. In other words, the environmental distancewas more important in the overstory vegetation, whereas distance between plots was more important in the understory vegetation. This study suggests that diversity patterns and the drivers of plant community may be different among forest strata and that a combined interaction of different mechanisms from overstory and understory strata influences plant community formation on a riparian forest in Mt. Gyebang, South Korea.
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