マングローブ林内の水路の水面の浮遊物質の有機・無機組成

概要

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At the low tide, floating material was found in the tributary in mangrove forest. When the tide came in, floating material flowed from upstream. This material likes oil slick that has floated on the water of tributary. We investigated that floating material was in tributary of Fukido river in Ishigaki Island, Japan. Quartz, feldspars, rozenite (FeSO_4・4H_2O) and magnetite (Fe_3O_4) were identified by XRD. Iron content of floating material, surface soils and water of tributary were 3.4, 4.3-4.4 and 0.7-1.0g/kg, respectively. It is possible that rozenite and manetite were formed by the iron and sulfide ions that were originated from sea water and mangrove soil. From result of infrared spectrum of freeze-dried floating material, the band of polysaccharide and lignin at 1100-1020 and 897cm^<-1> was observed, it is possible that floating materials is derived from branches and leaves mangrove. Humin (46.4Cg/kg) content was higher than other fractions (Humic acid and fulvic acid =28.0 and 15.3g/kg). Since the humin fraction and iron strongly adsorbed was called, it is possible that organo - mineral complex was formed by metal ions and organic matter from seawater and mangrove.
日本粘土学会の論文
2008-11-07