CHARACTERISTICS OF CO<sub>2</sub> ABSORPTION AND EMISSION IN THE HIGH WATER TEMPERATURE SEASONS AT THE NORTH SALT MARSH OF OSAKA NANKO BIRD SANCTUARY

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  • 大阪南港野鳥園北池塩性湿地における高水温期のCO<sub>2</sub>吸排出特性

Abstract

 Field investigations were conducted at the north salt marsh of Osaka Nanko bird sanctuary (ca. 43100 m2) in high water temperature seasons of 2012-2014 and the amount of net CO2 absorption was estimated along with the characteristic of CO2 absorption and emission on the surface of the sediment. Gross CO2 absorption flux was closely related to sediment temperature, chlorophyll a and photon flux density, while CO2 emission flux changed depending on the sediment temperature and groundwater level. The groundwater level was thought to be indispensable for estimating the flux of CO2 emission on the sediment. For instance, when it was supposed groundwater level was equal to tidal level, the CO2 emission flux from the sediment reached 29 tons. It showed 2.1 times higher than the value which was estimated by using actual ground water level. Using the relationship of CO2 flux with sediment temperature, chlorophyll a, photon flux density and groundwater level, the total CO2 absorption and/or emission of the north salt marsh of Osaka Nanko bird sanctuary was estimated as ca. 23 tons for absorption and ca. 14 tons for emission in May to September, 2014. These results suggest that a net of 9 tons CO2 was absorbed and this salt marsh plays the role of a CO2 sink in the high temperature season of a year.

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