The concept of Satoumi originated in Japan is aiming at well-balanced sustainable management of coastal seas not only in water quality but also in ecosystem and ecosystem services. Varieties of activities by local people on the creation of Satoumi are gradually gaining ground especially in more or less polluted enclosed coastal seas in Japan, where ecosystem and living resources were deteriorated. Since activities on Satoumi have close relationship with integrated coastal management （ICM), recent activities on the creation of Satoumi were reviewed with special reference to ICM. After discussing present status and future perspectives of Satoumi within the frame of ICM, Satoumi can be characterized as bottom-up type of local initiative with special reference to the maximization of ecosystem services and integrated coastal and river basin management.
Iron is an essential element for plant growth. But iron is converted into insoluble form because of a pH change; however, most of the dissolved iron has been found to form metal-organic complexes. Fulvic acid and low molecular weight organic acids produced in forests and marsh lands are responsible for dissolving Fe from minerals in rocks or parent material into the soil, and for maintaining its solubility in water. Rivers play an important role in transporting the complex to the sea because their source region is in the mountains and runs through various terrains till it reaches the sea. Recently, research into a transport of iron in the Amur River has been performed as the Amur-Okhotsk Project. Also tree-planting program is in progress in many regions of Japan with reference to fulvic acid. However, the qualitative and quantitative processes of iron transport with fulvic acid from land to sea are not well understood. To gain better understanding of the transport mechanism of fulvic acid from the forest to the sea, we analyzed water and soil sampls along sites in the Obitsu River by fluorescence spectrophotometer. Moreover, we disclosed the relation between net material production and phytoplankton.
This study offers an application for the disengagement and adsorption of phosphorus, which can be used for the removal of phosphorus from the YATSU tidal flat, Chiba. Firstly, we measured the ionic behavior of the YATSU tidal flat water and mud with a cyclone aerator in a vessel. Phosphoric acid was released in the water when remains in the pH were low. Concentration of phosphoric acid decreases with concentration of nitrous, and nitric acids increase under anerobic conditions. There is a high degree of probability for the presence of microbes, which can accumulate and release phosphorus. Secondly, we measured the removability of phosphorus from classified oyster shells using a batch system. The shell give off phosphoric acid up to 0.1∼0.4mg/L (survival concentration). In addition, we attempted to remove phosphoric acid and synthesize sphere particles. In the case of a template like Proteus mirabilis, it was confirmed that sphere calcium phosphate were in the condition of [Ca]0 : 17mmol/L, Ca/P value of 3.33. Comparable results obtained at [Ca]0=1.0×10−1mol/L in the case of a template like klebsiella pneumoniae H12, and it was suggested that the generation of surplus ammonia nitrogen harms local crystallization on solid-liquid interfaces