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- 저자 : 오지철 ( Ji Chul Oh ) (검색결과 2 건)
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갈조류 감태(Ecklonia cava)의 포자체와 배우체 생장에 영향을 주는 수온과 pCO<sub>2</sub> 농도의 상호작용
오지철,유옥환,최한길,Oh, Ji Chul,Yu, Ok Hwan,Choi, Han Gil 한국해양과학기술원 2015 Ocean and Polar Research Vol.37 No.3
To examine the effects of increased $CO_2$ concentration and seawater temperature on the photosynthesis and growth of forest forming Ecklonia cava (Laminariales, Phaeophyta), sporophytic discs and gametophytes were cultured under three $pCO_2$ concentrations (380, 750, 1000 ppm), four temperatures (5, 10, 15, $20^{\circ}C$ for sporophytes; 10, 15, 20, $25^{\circ}C$ for gametophytes), and two irradiance levels (40, $80{\mu}mol$ photons $m^{-2}s^{-1}$) for 5 days. Photosynthetic parameter values ($ETR_{max}$, $E_k$, and ${\alpha}$) were generally higher as sporophytic discs were grown under low temperature and increased $CO_2$ concentration at 750 ppm. However, photosynthesis of Ecklonia sporophytes was severely inhibited under a combination of high temperature ($20^{\circ}C$) and 1000 ppm $CO_2$ concentration at the two photon irradiance levels. The growth of gametophytes was maximal at the combination of 380 ppm (present seawater $CO_2$ concentration) and $25^{\circ}C$. Minimal growth of gametophytes occurred at enriched $pCO_2$ concentration levels (750, 1000 ppm) and high temperature of $25^{\circ}C$. The present results imply that climate change which is increasing seawater temperature and $pCO_2$ concentration might diminish Ecklonia cava kelp beds because of a reduction in recruitments caused by the growth inhibition of gametophytes at high $pCO_2$ concentration. In addition, the effects of increased temperature and $pCO_2$ concentration were different between generations - revealing an enhancement in the photosynthesis of sporophytes and a reduction in the growth of gametophytes.
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한국 남해안 다도해·한려해상국립공원 도서의 해조상 및 군집구조 변화
오지철(Ji Chul Oh),김호연(Ho Yeon Kim),조현근(Hyun-Geun Cho),김철도(Cheol Do Kim),안중관(Jung Kwan Ahn) 국립공원연구원 2015 국립공원연구지 Vol.6 No.3
We investigated species composition and variation of benthic marine algae between 2014 at southern coast island, Korea. Coarsely branched form seaweeds were dominant functional group comprising 47.73% in species number, whereas filamentous form (18.64%), sheet form (11.82%), thick leathery form (9.55%), crustose form (6.82%), jointed calcareous form comprised 5.45%. C/P, R/P and (C+R)/P values were 0.33, 0.96 and 2.57, respectively. Such fast growing ESG II (ecological state group) was 22.65% and slow growing perennial algae, ESG I was only 77.35%. 본 연구는 14년 남해 연안 도서에서 조하대 해조류 종구성과 변화를 파악하기 위해 수행하였다. 연구기간 출현한 해조류는 총 220종(녹조 20종, 갈조 60종, 홍조 140종)이 출현하였다. 해조류의 기능형은 성긴분기형(47.73%), 사상형(18.64%), 엽상형(11.82%), 다육질형(9.55%), 각상형(6.82%), 유절산호말형(5.45%)으로 구분되었다. 해조상의 지역적 특성을 나타내는 C/P값은 0.33을 보였고, R/P값은 0.96, (R+C)/P값은 2.57로서 혼합형 해조상을 보였다. 또한, 환경상태와 밀접한 관련을 보이는 ESG II의 비율은 약 22.65%를 보여 해조상을 통해 파악된 국립공원 내 도서지역 환경상태는 양호한 편이다.
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