Journal of the Korean Society of Marine Environment & Safety (해양환경안전학회지)

The Korean Society of Marine Environment and safety (해양환경안전학회)
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Estimation of Nutrient Mass Balance in a Phragmites Australis Community in Jinudo Through a Mesocosm Experiment

메조코즘 실험을 통한 진우도 갈대군락의 영양염 물질수지 산정

  • RYU, Sung Hoon (Department of Ocean Engineering, Pukyong National University) ;
  • LEE, In cheol (Department of Ocean Engineering, Pukyong National University)
  • Received : 2018.07.02
  • Accepted : 2018.08.28
  • Published : 2018.08.31
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Abstract

In this study, we performed a mesocosm experiment to estimate the mass balance of Nutrients (DIN, DIP) in a phragmites australis community. We developed 4 mesocosm tanks which is available to circulate seawater with adjustable tide levels and flooding times. Each of the mesocosm tanks were filled with phragmites australis and sediment from Jinudo in Nakdong Estuary. We investigated DIN, DIP concentrations in three layers (seawater-phragmites australis-sediment) to estimate the mass balance of Nutrients and biomass. Growth rates were also investigated. The results can be summarized as follows. 1) In spring, rhizome biomass was higher than that of aerial stem by about 6.3~9.7%. In summer, aerial stem biomass was higher than that of rhizome about 19.2~21.2 %. 2) Th Growth rate of phragmites in Mesocosm Tank A was faster than in Mesocosm Tank D by about 2 to 3 times for aerial stem and rhizome. 3) The Concentration of nutrients (DIN, DIP) in each mesocosm Tank showed 2~3 % variance in spring and summer. 4) The biomass in each mesocosm varied by about 23 % which was higher than the concentration variance for each mesocosm tanks.

본 연구에서는 갈대군락의 영양염 물질수지 모델 구축을 위한 기초연구로서, 갈대군락 Mesocosm 실험을 통해 수층-갈대(뿌리, 잎, 줄기)-토양의 영양염(DIN, DIP) 농도의 춘계 및 하계 모니터링 결과를 이용하여 물질수지를 산정하였으며, 결과는 다음과 같다. 1) 갈대의 생체량은 춘계에는 지하경이 지상경에 비해 약 6.3~9.7 % 높으며, 하계에는 지상경이 지하경에 비해 약 19.2~21.2 % 높게 나타났으며, 갈대의 성장속도는 Mesocosm Tank A가 Mesocosm Tank D에 비해 지상경과 지하경 모두 2~3배 정도 빠르게 나타났다. 2) Mesocosm Tank에서의 갈대의 영양염(DIN, DIP) 농도는 춘계와 하계 모두 각각 2~3 %로 차이가 적었다. 3) Mesocosm Tank별 생체량의 차이는 최대 23 %로 나타나지만, 갈대가 흡수하는 영양염의 농도는 최대 3 % 정도로 차이가 적었다.

Keywords

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