Tokoro Tatsuki1,2* and Kuwae Tomohiro2 1Center for Global Environmental Research, National Institute for Environmental Studies, Tsukuba, Japan 2Coastal and Estuarine Environment Research Group, Port and Airport Research Institute, Yokosuka, Japan Despite the potential for carbon storage in tidal flats, little is known about the details of relevant processes because of the complexity of intertidal physical and chemical environments and the uniqueness of the biota.