Quantification of Purification Ability for Organic Matter at Natural and Constructed Tidal Flats and the Role for Purification in Hiroshima Bay.

1998 ◽  
Vol 21 (3) ◽  
pp. 149-156 ◽  
Author(s):  
Jeoung gyu LEE ◽  
Wataru NISHIJIMA ◽  
Tetsuo MUKAI ◽  
Kazuto TAKIMOTO ◽  
Tohru SEIKI ◽  
...  
Keyword(s):  
Organic Matter ◽  
Tidal Flats

scholarly journals Study on Purification Ability for Water Quality in Tidal Flats in Hiroshima Bay-Evaluation for the Characteristics of Organic Matter Decomposition.

1998 ◽  
Vol 21 (7) ◽  
pp. 421-428 ◽  
Author(s):  
Tohru SEIKI ◽  
Kiyonori HIRAOKA ◽  
Jeoung gyu LEE ◽  
Wataru NISHIJIMA ◽  
Tetsuo MUKAI ◽  
...  
Keyword(s):  
Water Quality ◽  
Organic Matter ◽  
Tidal Flats ◽  
Organic Matter Decomposition

scholarly journals Comparison for Structure and Functions of Organic Matter Degradation at Natural and Constructed Tidal Flats. A case study in Hiroshima bay.

1997 ◽  
Vol 20 (3) ◽  
pp. 175-184 ◽  
Author(s):  
Jeoung gyu LEE ◽  
Wataru NISHIJIMA ◽  
Tetsuo MUKAI ◽  
Kazuto TAKIMOTO ◽  
Tohru SEIKI ◽  
...  
Keyword(s):  
Organic Matter ◽  
Tidal Flats ◽  
Organic Matter Degradation ◽  
Structure And Functions

scholarly journals Effects of Sediment Characteristics on Carbon Dioxide Fluxes Based on Interacting Factors in Unvegetated Tidal Flats

2021 ◽  
Vol 8 ◽  
Author(s):  
Wei-Jen Lin ◽  
Ming-Chih Chiu ◽  
Chiao-Wen Lin ◽  
Hsing-Juh Lin
Keyword(s):  
Organic Matter ◽  
Primary Production ◽  
Structural Equation Models ◽  
Net Primary Production ◽  
Organic Matter Content ◽  
Carbon Fluxes ◽  
Tidal Flats ◽  
Matter Content ◽  
Sediment Characteristics ◽  
Microalgal Biomass

The contribution of unvegetated tidal flats to global net primary production is comparable to that of some vegetated coastal habitats. However, compared to carbon flux regulating factors in vegetated habitats, those in unvegetated tidal flats are not well understood, particularly in terms of their cause-effect relationships. Maximum gross primary production (GPPm), net primary production (NPP) and total respiration (TR) during emersion at noon when the irradiance level was at the saturation level for photosynthesis in nine unvegetated tidal flats across the Taiwan Strait in tropical and subtropical regions were determined in winter and summer from 2011 to 2016 to examine the direct and indirect relationships between sediment characteristics and carbon fluxes by using structural equation models (SEM). Most of the GPPm and NPP values were higher in winter than in summer. Conversely, the TR values were higher in summer than in winter. The NPP values at some sites shifted to negative values in summer, indicating the sites were carbon sources. The values of GPPm, TR and NPP for the tidal flats all increased significantly with increasing sediment mud content. The SEM results showed that the sediment mud content directly increased GPPm or indirectly increased GPPm via a compositional shift in benthic microalgae. The sediment mud content also directly increased TR or indirectly increased TR via increased organic matter content. The contribution of benthic microalgal and macrofaunal biomass to TR was relatively minor. This result suggests that primary production was stimulated mainly by the organic matter content rather than by increased microalgal biomass. With the integrated SEM framework, our results showed mechanistic evidence of how sediment mud content acted as a critical factor regulating carbon fluxes in unvegetated tidal flats.

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