연안 환경의 하나인 하구(estuary)는 육상기원 물질이 해양으로 유입되는 통로이다. 그러나 이 지역은 단순히 “통로” 이상의 역할을 하고 있으며 자체로서 풍부한 생태계를 이루고 있다(안 2005, Teal 1962). 연안 하구로 유입된 무기물이나 유기물들은 생물, 지질, 화학적인 과정을 거쳐서, 그 양이 증가하거나 감소하고, 다른 형태로 바뀌는 소위 생지화학적 순환(biogeochemical cycling)을 거치게 된다(Howe et al. 1984). 연안하구를 하나의 시스템으로 가정 했을 때, 이곳에서 일어나는 생지화학적과정은 육상기원 물질이 연안하구를 거쳐 해양으로 유입되는 양과 종류를 결정하게 되며, 결국 해양의 생산성에 영향을 끼치게 된다(Howarth et al. 1988).
Seasonal biomass and carbon, nitrogen contents change of marsh club-rush (Schoenoplectus trigueter) was investigated in Nakdong river estuary, located near Busan, Korea. New shoot of S. trigueter sprouted from tuber in April and fast growth season was followed until mature in August. Mature lengths of shoot and root were 60 and 9.4 cm, respectively. The increase of biomass showed similar seasonal trends with length. Mature biomass were 3.5 g ind-1 in wet weight and 0.6 g ind-1 in dry weight. The biomass of S. trigueter in areal basis was also highest during July and August (186 g DW m-2). The shoot of S. trigueter was disappeared in October from the ground but the biomass of shoot was maintained as a form of detritus in sediment. The amount of S. trigueter detritus was about 30∼50% of the biomass in August. During winter, the amount of detritus decreased with time but the biomass of root+tuber remained same, implying the root+tuber part is alive. The net productivity of S. trigueter estimated from biomass change were 538 g DW m-2 yr-1 , 240 g-C m-2 yr-1, 8.2 g-N m-2 yr-1 in dry weight, carbon and nitrogen equivalent respectively. During winter, carbon to nitrogen ratio in detritus increased implying the preferred remineralization of nitrogen during microbial degradation.
1. 서 론 2. 조사방법 3. 결과 및 토론 4. 결 론 참고문헌주요
