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Variation of Water Qualities Due to Freshwater Introduction to Tidal Flat: A Mesocosm Study  

Kim Yeong-Tae (Graduate School of oceanography Kunsan National University)
Jeong Yong-Hoon (Graduate School of oceanography Kunsan National University)
Chae Youn-Ju (Graduate School of oceanography Kunsan National University)
Rhee Choong-Won (Graduate School of oceanography Kunsan National University)
Kim Soh-Yong (Graduate School of oceanography Kunsan National University)
Choi Kang-Won (Rural Research Institute, KARICO)
Yang Jae-Sam (Graduate School of oceanography Kunsan National University)
Publication Information
The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY / v.11, no.2, 2006 , pp. 49-67 More about this Journal
Abstract
A mesocosm, an artificial tidal flat ecosystem, was constructed outdoors to simulate in situ physical and biochemical environmental conditions of natural tidal flat as much as possible. During the experiment from February to August 2004, the study was focused on the biogeochemical variations of superficial water and porewater after introduction of freshwater into the mesocosm. The mesocosm has three experimental conditions; SW-M-T: maintaining the saline water of approximately 20 psu; FW-M-T: complete exchange of freshwater ul the mesocosm with continuous mixing of water column: FW-NM-T: complete exchange of saline water to freshwater in the mesocosm without mixing of water column. Mass extinction of benthic macrofauna appeared due to drastic decrease of porewater salinity from 20 psu to less than 10 psu between the 63th and 91st day of freshwater introduction in FW-M-T and FW-NM-T. Throughout the periods, 7/8 of bivalves and 2/3 of polychaete populations have been extinguished in the sediment. In FW-NM-T, as temperature rises, both evident decrease of DO in water column and active release of DIP from sediment were observed. ${NO_3}^-$ was removed from water column into sediment throughout the periods. Therefore extremely low ${NO_3}^-$ was found during late spring and summer. Whereas ${NH_4}^+$ exhibited only $1/2{\sim}1/8$ of ${NO_3}^-$ concentration. Unexpectedly even after mass extinction of benthic macrofauna, we were not able to find high ${NH_4}^+$. This mesocosm study suggests that when fresh water introduce to natural tidal flat, its sediment activity functions as a potential source of DIP, but a sink of ${NO_3}^-$.
Keywords
Mesocosm; Freshwater Introduction; Mass Extinction;
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Times Cited By KSCI : 1  (Citation Analysis)
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