レーザー散乱法による土壌の粒径測定

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The particle-size distribution of soils is usually measured by the sedimentation method based on the Storkes's law. The procedure of the sedimentation method is not complicate, but it needs much time. Recently, a laser scattering method based on Mie scattering theory has applied to determine the particle-size distribution. This laser scattering method requires smaller spacimens and shorter time, only a few minutes, for measurement than the sedimentation one. In this study, the correlation between the laser scattering and the sedimentation method was discussed by using 52 soils from paddy and upland fields. Moreover, the variation of particle-size distribution in a horizon of a paddy soil located in Syonaka-no-ko polder near Lake Biwa, which have the share of 20,000 years' sediments, was observed each 5cm in depth by the laser scattering method. The correlation between both two methods were high and the correlation coefficient, R in clay, silt and fine sand fraction was 0.83, 0.85 and 0.87, respectively. While these two methods are built under the supposition that particle shape is a sphere. The particle shape became more far from the sphere and the correlation would decrease, as the particle size became fine, in consequent. The soil texture estimated from the laser scattering method didn't clearly correspond to that from the sedimentation one. The particle-size distribution in the horizon of polder soil was varied continuously or discontinuously in each depth. This suggested that the laser method was useful for the observation of relative distribution of particle-size within the same soil-horizon.
日本ペドロジー学会の論文
1999-12-31

レーザー散乱法による土壌の粒径測定

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