Chemical properties and organic matter compositions of soil solutions collected by porous cup (PC), centrifugation (CF) and shaking extraction with distilled water (SE) were investigated. Soil solutions were obtained from surface and sub-surface layers in Umbric Andosol under forests. Yields, total organic carbon (TOC) and organic matter compositions of the soil solutions were different with the sampling methods. Yields, TOC, A_<400> and pH were higher in soil solutions collected by PC than in soil solutions collected by the other two methods. It was supposed that organic matter and bases were extracted from soil particles and humus in the PC sampling process. Proportions of unquantified organic carbon (uqoc) in TOC were high in soil solutions obtained by SE. SE should extract slightly soluble organic matter. On the other hand, in CF, soil solutions could be obtained from bulked soil in a short period of time, and variations in data were smaller than the other methods. Therefore, centrifugation from bulked soils would be a suitable method for obtaining soil solutions. Uqoc fractions, which were dominant in all sampling methods, were considered to be relatively high molecular weight fractions consisting of polysaccharides and aliphatic chains. Sugars were dominant in quantified organic matter.
