Journal of Ecology and Environment

The Ecological Society of Korea (한국생태학회)
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Early Stage Decomposition of Emergent Macrophytes

대형 수생식물의 초기 분해에 관한 연구

  • 신진호 (중앙대학교 생명과학과 생태학연구실) ;
  • 최상규 (중앙대학교 생명과학과 생태학연구실) ;
  • 연명훈 (중앙대학교 생명과학과 생태학연구실) ;
  • 김정명 (중앙대학교 생명과학과 생태학연구실) ;
  • 심재국 (중앙대학교 생명과학과 생태학연구실)
  • Published : 2006.12.31
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Abstract

This study examined the decomposition of blades and culms of aquatic emergent plant species, Zizania latifolia, Phragmites communis and Typha angustata, which were the most frequent in Lake Paldang. The experiment was carried out from July to December, 2005 in fresh water of lake Paldang using litter bag method. The litter bags had 1.2 mm mesh size and were suspended at 1 m depth of water surface. Remaining mass of blades and culms of each species after 97 days was 21.2% and 22.6% of initial mass in Z. latifolia, 32.5% and 56.4% in P. communis and 44.7% and 38.1 % in T. angustata, respectively. The plant tissue having high N concentration and low C/N exhibited the faster decay rate than the others. However, the tissue of high content of lignin, cellulose, lignin:N, and cullulose:N showed a slow decomposition rate. Water temperature was the most effective environmental factor on the emergent macrophyte litter decomposition in aquatic ecosystems. According to the water temperature, DO, $NO_3^-$-N, and total phosphate concentration were changed in the linear way. The mass loss of plant tissue of emergent macrophytes showed positive relationship with P concentration in water. The experiments on the decomposition of the litter using different mesh sized litter bag did not show significant differences between them. The results suggest that the decomposition of emergent macrophytes in fresh water of lake Paldang, which showed features of lentic and lower part of a stream, was affected by microbial activities better than the micro-invertebrates such as shredders.

팔당호에서 분포 면적과 빈도가 가장 큰 대형 수생 식물인 줄(Zizania latifolia), 갈대(Phragmites communis), 애기부들(Typha angustata) 3종의 잎과 줄기의 분해 실험을 낙엽 주머니 법(litter bag method)을 이용하여 2005년 7월에서 12월까지 실험하였다. 97일간의 실험 기간 동안 줄의 잎과 줄기는 각각 초기 건중량의 78.8%와 77.4%, 갈대의 잎과 줄기는 각각 67.5%와 43.6%, 애기부들의 잎과 줄기는 각각 55.3%와 61.9% 분해되었다. 식물체의 분해로 인한 중량 감소는 높은 질소(N) 함량과, 낮은 C/N을 보인 종과 식물체 부위에서 빠른 분해율을 나타내는 뚜렷한 상관이 있었다. 반면에 리그닌(lignin)의 함량이 높거나, lignin/N, cellulose/N이 높은 식물 종과 부위에서는 그 분해율이 늦은 것으로 나타났다. 수온과 수중 인(P)의 함량 변화와 낙엽 분해율 사이에는 양의 상관을 보였으나, $NO_3^-$-N 함량과는 음의 상관을 보였다. 더욱이 낙엽주머니의 망목의 크기를 달리한 각 낙엽주머니에서의 분해율은 차이를 나타내지 않아 이들 식물체의 분해는 대부분 갉아먹는 수생미소절지동물에 의하여 진행되는 것이 아니라 세균이나 곰팡이 등과 같은 미생물의 작용에 의하여 분해되고 있는 것으로 보이며, 특히 수중의 질소와 인(P)의 함량은 수온의 변화와 함께 이들 미생물의 소장에 영향을 주는 주요 환경요소로서 수중 식물체의 분해에 영향을 미치는 것으로 여겨진다.

Keywords

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