EVALUATION OF CARBON ABSORPTION OF PHYTOPLANKTON AT THE NORTH SALT MARSH OF OSAKA NANKO BIRD SANCTUARY
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- ENDO Toru
- 大阪市立大学大学院 工学研究科都市系専攻
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- KAWASAKI Taiki
- いであ株式会社 環境技術部
Bibliographic Information
- Other Title
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- 大阪南港野鳥園北池の炭素動態における植物プランクトンの炭素吸収量の評価
- オオサカ ナンコウ ヤチョウエン キタチ ノ タンソ ドウタイ ニ オケル ショクブツ プランクトン ノ タンソ キュウシュウリョウ ノ ヒョウカ
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Abstract
Recently, the carbon absorption process of wetland ecosystem is getting a lot of attention as a new ecosystem function. It is important to understand the carbon cycle of salt marsh in urban coastal area for coastal management of future. In this study, an incubation experiment on phytoplankton photosynthesis and field investigations on carbon cycle in salt marsh were conducted at the north salt marsh in Osaka Nanko bird sanctuary in order to evaluate the effect of phytoplankton on the carbon budget of salt marsh. The carbon absorption rate per chlorophyll a was formulated as a function of temperature and photon flux density, and the carbon emission rate of respiration and decomposition in seawater was formulated as a funciton of temperature by measureing DIC changes in the seawater under light and dark conditions. It was found that the rate of the air-sea carbon exchange is smaller than the carbon absorption rate of phytoplankton, and there was no correlation between them, according to estimation of the rate of air-sea carbon flux and amount of carbon absorption of phytoplankton obtained by the seasonal investigation on phytoplankton biomass and DIC of surface water. Finally, it was suggested that the ratio of photosynthesis to carbon budget of the salt marsh was from 10 to 30 % from comparing the dayly variasion of the carbon cycle due to the air-sea exchange, the water exchange, the carbon absorption of phytoplankton and the carbon emission of respiration and decomposition in sea water.
Journal
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- Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering)
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Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 73 (2), I_1369-I_1374, 2017
Japan Society of Civil Engineers
