Studies on photosynthesis carbon fixation and ocean acidification prevention in<em> Ulva prolifera</em> I.Rate of photosynthesis carbon fixation and seawater pH increase

FENG Zihui; MENG Yang; LU Wei; CHEN Qunfang; YU Kefeng; CAI Chuner; HUO Yuanzi; WU Weining; WEI Hua; HE Peimin

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Article Navigation > Haiyang Xuebao > 2012 > 34(2): 162-168

FENG Zihui, MENG Yang, LU Wei, CHEN Qunfang, YU Kefeng, CAI Chuner, HUO Yuanzi, WU Weining, WEI Hua, HE Peimin. Studies on photosynthesis carbon fixation and ocean acidification prevention in Ulva prolifera I.Rate of photosynthesis carbon fixation and seawater pH increase[J]. Haiyang Xuebao, 2012, 34(2): 162-168.

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Studies on photosynthesis carbon fixation and ocean acidification prevention in Ulva prolifera I.Rate of photosynthesis carbon fixation and seawater pH increase

1.
College of Fisheries and Life Science, Shanghai Ocean University, Shanghai 201306, China;Institute of Marine Science, Shanghai Ocean University, Shanghai 201306, China;Office of Information Technology, Shanghai Fisheries Research Institute, Shanghai 200433, China
2.
College of Life Science, Agriculture University of Nanjing, Nanjing 210095, China
3.
College of Fisheries and Life Science, Shanghai Ocean University, Shanghai 201306, China;Institute of Marine Science, Shanghai Ocean University, Shanghai 201306, China
4.
College of Fisheries and Life Science, Shanghai Ocean University, Shanghai 201306, China

Received Date: 2011-02-16
Rev Recd Date: 2011-06-21

Abstract

Abstract

The effects of DIC levels on the photosynthesis of Ulva prolifera, carbon absorbing capacity at aquatic and aerial state, and pH value improving ability, were studied under laboratory conditions. The results show that the value of K_m(DIC) for photosynthesis of U. prolifera is 0.25 mmol/dm³, and photosynthesis of U. prolifera is saturated at 1.2mmol/dm³ of DIC concentration in seawater, which is extremely lower than ambient DIC concentration(2.4 mmol/dm³, DIC) in normal seawater. It indicates that the blades in U. prolifera could keep a vigorous photosynthesis and growth during "green tide" blooming. In seawater, the blades of U. prolifera absorbed the DIC from seawater. Cultured with blade density of 0.5 g/dm³, the rate of carbon fixation of U. prolifera by photosynthesis is 10.92 mg/(g·d)(FW) for one photosynthesis period. Cultured for 5 d, the DIC concentration in 0.5, 1.0 and 2.5 g/dm³ blade density groups decreases to 4.85, 2.62 and 0.66 mg/dm³ respectively. It indicates that DIC uptaking rate increases with the blade density increase, and the DIC concentration removal rate is 77.78%, 88.00% and 96.98% for 0.5, 1.0 and 2.5 g/dm³blade density groups, respectively. When blades absorbed the DIC out of seawater, they immediately increased the pH in seawater, and the rate for pH increasing reached to 0.96 /(dm³·g·d) in culture system with 0.5 g/dm³ blade density during one photosynthesis period. Cultured for 5 d, the pH value in 0.5, 1.0 and 2.5 g/dm³blade density groups increases to 9.1, 9.2 and 9.7 in the first culture day respectively, and keeps at 9.9 in the 5th day. It indicates that the higher the blade density, the higher the pH in culture system.When exposed in air, the blades could absorb the CO₂ from air. The rate of photosynthetic carbon fixation of U.prolifera in the air is about 46.14 mg/(g·d) during one photosynthesis period, and it is 4.23 times more than that in water. The photosynthesis carbon fixation efficiency for unit mass would decrease for shading among blades. It indicates that this study will provide the supports for green tide blooming mechanism study and estimating its CO₂ emission reduction and ocean acidification prevention.
- Ulva prolifera,
- dissolved inorganic carbon,
- photosynthetic carbon fixation,
- ocean acidification,
- aquatic,
- aerial

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References(26)

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