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Studies on the genesis and classification of paddy soils derived from red earth in fujian province china



Studies on the genesis and classification of paddy soils derived from red earth in fujian province china



Acta Pedologica Sinica 26(4): 371-378



The content of humin and ratio of H/F in surface horizon of soils increases with the following order: original soil (red earth) < percogenic paddy soil < periodically waterlogged paddy soil < gleyed paddy soil. Fed-o/Feo ratio is a good genetic index for dividing paddy soils developed under different water regimes. This ratio in diagnostic horizon (W) of periodically waterlogged paddy soil profile is much higher than that in other horizons. The magnetic susceptibility X value of paddy soils is much lower than that of their corresponding original soil derived from the same parent material. Each type of paddy soils derived from red earth has its unique distribution of magnetic susceptibility in the profile. The composition of layer clay minerals and SiO2/Al2O3 ratio in clays show no obvious difference between paddy soils and their original soils. Soil texture, content of organic matter, H/F value, magnetic susceptibility, iron-enrichment coefficient and even SiO2/Al2O3 ratio are influenced by parent material. It is suggested by the authors that the factor of parent material could be used as one of the indices for family category dividing in the classification of paddy soils derived from red earth.

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Accession: 007835017

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