Seasonal and spatial variation in the denitrifying activity in estuarine and lagoonal sediments |
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| Authors: | Yukiko Senga Minoru Okumura Yasushi Seike |
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| Institution: | 1.Department of Environment Systems, Faculty of Geo-Environmental Science,Rissho University,Magechi, Kumagaya, Saitama,Japan;2.Department of Material Science, Faculty of Science and Engineering,Shimane University,Nishikawatsu, Matsue, Shimane,Japan |
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| Abstract: | We have elucidated the seasonal and spatial variation in the potential denitrifying activity in estuarine and coastal lagoonal
sediments in Lakes Shinji and Nakaumi, Japan. The denitrifying activity increased from summer through autumn and was positively
correlated with the temperature of the overlying water at all sites except one, where the bottom was always more reductive
than at the other sites and there was no NO3
− as a substrate for denitrification from spring to autumn. Moreover, the relationship between the denitrifying activity and
the distance from the sea showed different trends in estuarine and lagoonal sediments. These spatial differences indicate
that different factors regulate the denitrification in estuarine and lagoonal sediments. Denitrifying activity in estuarine
sediment was regulated by the discharge of freshwater containing NO3
− or organic matter, while in the lagoonal sediments the occurrence of nitrification via the intrusion of oxic seawater into
the reductive sediment appears to be a key requirement for the process of denitrification. Therefore, the denitrifying activity
in the lagoonal sediment appears to be greater near the sea. Water intrusion is one of the key factors controlling denitrification
in coastal marine ecosystems by affecting the supply of substrate available for denitrification. |
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