방사무늬김(Porphyra yezoensis Ueda)의 영양염과 이산화탄소 흡수율 정밀 평가를 통한 양식해역의 질소와 탄소 요구량 산정
Variations in Nutrients & CO2 Uptake Rates of Porphyra yezoensis Ueda and a Simple Evaluation of in situ N & C Demand Rates at Aquaculture Farms in South Korea
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In order to understand the contribution of seaweed aquaculture to nutrients and carboncycles in coastal environments, we measured the nutrients & carbon uptake rates of Porphyrayezoensis Ueda sampled at Nakdong-River Estuary using a chamber incubation method from November2011 to April 2012. It was observed that the production rate of dissolved oxygen by P. yezoensis(n=30~40) was about 68.8±46.0 μmol gFW-1 h-1 and uptake rate of nitrate, phosphate anddissolved inorganic carbon (DIC) was found to be 2.5±1.8 μmol gFW-1 h-1, 0.18±0.11 μmol gFW-1h-1 and 87.1±57.3 μmol gFW-1 h-1, respectively. There was a positive linear correlation existed betweenthe production rate of dissolved oxygen and the consumption rates of nitrate, phosphate andDIC, respectively, suggesting that these factors may serve as good indicators of P. yezoensis photosynthesis. Further, there was a negative logarithmic relationship between fresh weight of thallusand uptake rates of nutrients and CO2, which suggested that younger specimens (0.1~0.3 g) weremuch more efficient at nutrients and CO2 uptake than old specimens. It means that the early culturingstage than harvesting season might have more possibilities to be developed chlorosis by highrates of nitrogen uptake. However, N & C demanding rates of Busan and Jeollabuk-do, calculatedby monthly mass production and culturing area, were much higher than those of Jeollanam-do,the highest harvesting area in Korea. Chlorosis events at Jeollabuk-do recently might have developedby the reason that heavily culture in narrow area and insufficient nutrients in maximum yieldseason (Dec.~Jan.) due mostly to shortage of land discharge and weak water circulation. The annualDIC uptake by P. yezoensis in Nakdong-River Estuary was estimated about 5.6×103 CO2 ton,which was about 0.03% of annual carbon dioxide emission of Busan City. Taken together, we suggestmore research would be helpful to gain deep insight to evaluate the roles of seaweed aquaculture to the coastal nutrients cycles and global carbon cycle.
Abstract
In order to understand the contribution of seaweed aquaculture to nutrients and carboncycles in coastal environments, we measured the nutrients & carbon uptake rates of Porphyrayezoensis Ueda sampled at Nakdong-River Estuary using a chamber incubation method from November2011 to April 2012. It was observed that the production rate of dissolved oxygen by P. yezoensis(n=30~40) was about 68.8±46.0 μmol gFW-1 h-1 and uptake rate of nitrate, phosphate anddissolved inorganic carbon (DIC) was found to be 2.5±1.8 μmol gFW-1 h-1, 0.18±0.11 μmol gFW-1h-1 and 87.1±57.3 μmol gFW-1 h-1, respectively. There was a positive linear correlation existed betweenthe production rate of dissolved oxygen and the consumption rates of nitrate, phosphate andDIC, respectively, suggesting that these factors may serve as good indicators of P. yezoensis photosynthesis. Further, there was a negative logarithmic relationship between fresh weight of thallusand uptake rates of nutrients and CO2, which suggested that younger specimens (0.1~0.3 g) weremuch more efficient at nutrients and CO2 uptake than old specimens. It means that the early culturingstage than harvesting season might have more possibilities to be developed chlorosis by highrates of nitrogen uptake. However, N & C demanding rates of Busan and Jeollabuk-do, calculatedby monthly mass production and culturing area, were much higher than those of Jeollanam-do,the highest harvesting area in Korea. Chlorosis events at Jeollabuk-do recently might have developedby the reason that heavily culture in narrow area and insufficient nutrients in maximum yieldseason (Dec.~Jan.) due mostly to shortage of land discharge and weak water circulation. The annualDIC uptake by P. yezoensis in Nakdong-River Estuary was estimated about 5.6×103 CO2 ton,which was about 0.03% of annual carbon dioxide emission of Busan City. Taken together, we suggestmore research would be helpful to gain deep insight to evaluate the roles of seaweed aquaculture to the coastal nutrients cycles and global carbon cycle.
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