ESTIMATION OF CO<sub>2</sub> BUDGET IN THE ARTIFICIAL SALT MARSH DEVELOPED AT URBAN COASTAL ZONE BY SEASONAL 24-HOUR FIELD INVESTIGATIONS OF CO<sub>2</sub> FLUXES

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  • 都市沿岸域の人工湿地におけるCO<sub>2</sub>フラックスの四季調査とCO<sub>2</sub>吸収・放出量の推定
  • 都市沿岸域の人工湿地におけるCO₂フラックスの四季調査とCO₂吸収・放出量の推定
  • トシ エンガンイキ ノ ジンコウ シッチ ニ オケル CO ₂ フラックス ノ シキ チョウサ ト CO ₂ キュウシュウ ・ ホウシュツリョウ ノ スイテイ

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Abstract

 In order to estimate CO2 budget in a salt marsh in urban coastal zone, 24-hour field investigations of air-sea and air-intertidal flat CO2 fluxes were conducted at the north salt marsh at Osaka nanko bird sanctuary every season. CO2 fluxes from intertidal flat to the atmosphere ranged from -16.4 to 5.8 mg/m2/min, but the fluxes of both absorption and emission were very small in winter. On the other hand, CO2 fluxes from sea surface to the atmosphere ranged from -2.5 to 2.0 mg/m2/min. The variation trends of air-sea fluxes of every seasons were similar. Next, in order to examine the characteristics of CO2 absorptions and emissions, the relationships between each fluxes and environmental factors were analyzed. It was found that CO2 emissions from intertidal flat were related with mud temperature and air-sea CO2 fluxes related with pH. It was confirmed that CO2 absorptions of intertidal flat could be estimated by photon flux density and microalgal photosynthesis rates. Finally, CO2 budgets were calculated in consideration of variability characteristic of fluxes and area of intertidal flat and sea surface. It was found that the north salt marsh at Osaka nanko bird sanctuary usually absorbed CO2 from the atmosphere in all seasons (CO2 absorptions were 49.5 kg/day in spring, 32.5 kg/day in summer, 7.5 kg/day in fall, and 12.3 kg/day in winter).

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