천이계열에 따른 온대초원의 유기물량 축적량 변화

A Study on Change of an Accumulated Organi Matter Contents According to Successional Stage on Temperate Grassland

  • 이재석 (건국대학교 이과대학 생명과학과)
  • 발행 : 2004.09.01

초록

모델을 통한 지구의 탄소순환 과정을 정확한 예측과 검정을 위해서는 다양한 생태계에 대한 정확한 실측자료가 요구된다. 본 연구는 엔진부착형 패러그라이더로 손쉽게 얻을 수 있는 공중사진과 현장 관측을 통해 다양한 형태로 축적된 초원 생태계의 유기물(탄소량)을 정량하고 천이의 진행에 따라 초원 생태계의 유기물의 축적형태가 어떻게 변화할 것인가에 대해 고찰하였다. 연구결과 조사대상 지역의 주요 우점종은 서양미역취, 띠, 억새의 3종이었고, 각각의 군락에 축적된 유기물량은 서양미역취 군락이 7.00 kg $m^{-2}$, 띠군락이 9.18 kg $m^{-2}$, 억새군락이 12.68 kg $m^{-2}$ 로 천이후기로 진행할수록 높아지는 경향을 나타냈다. 하지만 토양에 축적된 유기물량은 반대의 경향을 나타냈다. 토양에 축적된 유기물이 적어짐에도 불구하고 군락이 축적된 총유기물량이 증가하는 이유는 억새군락이 가진 현존량이 증가하기 때문으로 나타났다. 초원생태계에서 천이계열상 가장 후기에 나타나는 억새군락의 우점도 증가는 지상에 온대초원생태계의 탄소축적량 증가에 기여할 것으로 사료된다.

To develop accurate and predictive global carbon cycle models, it is important to understand the change of accumulated carbon for many ecosystems according to successional stage. In this study, I measured total biomass, litter and soil organic matter contents through an aerial photo and field observation. As a result, accumulated organic matter contents per unit area (kg $m^{-2})$ of three communities composed at grassland were 7.00 kg $m^{-2}$, in Solidago altissima community, 9.18 kg $m^{-2}$, in Imperata cylindrica community, and 12.68 kg $m^{-2}$, in Miscanthus sinensis community, respectively. Accumulated total organic matter contents was high in Miscanthus sinensis community at later succession stage but soil carbon was low. In Miscanthus sinensis community, highly accumulated organic matter contents was resulted from increasing of biomass comparison with that of the other two communities. The pattern of accumulated organic matter contents was changed by changing of the dominant community due to progressing in succession. The accumulated carbon in temperate grassland will be increased with progressing in succession.

키워드

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