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The Origin of Sediment Organic Matters at Tidal Flat in Estuary  

Shin, Woo-Seok (Graduate school of Engineering Department of Ecological Engineering, Tohoku University)
Lee, Yong-Doo (Department of Civil & Environmental Engineering, Cheju University)
Fujibayashi, Megumu (Graduate school of Engineering Department of Ecological Engineering, Tohoku University)
Nagahama, Yumi (Graduate school of Engineering Department of Ecological Engineering, Tohoku University)
Nomura, Munehiro (Graduate school of Engineering Department of Ecological Engineering, Tohoku University)
Nishimura, Osamu (Graduate school of Engineering Department of Ecological Engineering, Tohoku University)
Publication Information
Journal of Korean Society of Environmental Engineers / v.32, no.1, 2010 , pp. 9-16 More about this Journal
Abstract
The purpose of this study is to clarify the origin of organic matters on sediment and the characteristics of seasonal variation at an estuarine tidal flat. Silt-clay content (<63 ${\mu}m$), chlorophyll a, TOC, C/N ratio and the stable isotope ratio of carbon and nitrogen were measured at tidal flat around the estuary of the Nanakita River. As a result, organic matters originating from marine organic matter and bethic microalgae greatly contributed to sedimentation of organic matters at Stn.A, sandy tidal flat, though terrigenous organic matters did at Stn.C, muddy tidal flat. Furthermore, it was revealed that the volume and origin of organic matters in the sediments depended on seasonal variation, and the factors were different from the Stns, i.e. bentic microalgae and event for Stn.A, and the eventual sedimentation of organic matters originating from terrestrial plants, respectively.
Keywords
Origin; Stable isotope; Seasonal variation; Sediment organic matter; Estuary ecosystem;
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