Clay Mineral Status of Paddy Soils from the Tai Lake Region of China in Relation to High Paddy-Rice Productivity

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概要

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• Soil samples which were collected in the Tai Lake region of China during the tour organized after the 14th International Congress of Soil Science in 1990 were analyzed for the determination of the concentration of rare earth elements, particle-size distribution, and clay mineralogical composition. Paddy soils distributed in the plain and polder areas were derived from Xiashu loess. The concentration ratios of Ce/Eu and Eu/Sm of these paddy soils were similar to one another but different from those of the soils in surrounding mountainous and hilly areas. The paddy soils contained large amounts of silt and clay. Discontinuity of the particle-size distribution in the profile was related to the man-made overburdening of mud from a neighboring canal. Mica and its weathering products were predominant clay minerals. Weathering products of mica consisted of smectite and vermiculite. Smectite was found to occur as mixed-layer minerals of mica/smectite and mica/vermiculite/smectite rich in smectite. Intermediate weathering of loess with these clay mineralogical properties was considered to be one of the factors contributing to the high paddy-rice productivity of soils in the Tai Lake region.

• 社団法人日本土壌肥料学会の論文

著者

• Egashira Kazuhiko

  Faculty Of Agriculture

• Iwashita S

  Faculty Of Agriculture Kyushu University

• Iwashita Soichi

  Faculty Of Agriculture Kyushu University

• Yamasaki Shin-ichi

  National Institute of Agro-Environmental Sciences

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