GENESIS AND TAXONOMIC CLASSIFICATION OF VERTISOLS IN YUNNAN-GUANGXI REGION OF CHINA
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    Abstract:

    For the understanding of the distribution of Vertisols and vertic soils in Yunnan-Guangxi region of China and better use of the soils, seven profiles were collected for the study of genetic properties and taxonomic classification. The results showed that the weathering process of Vertisols was much weaker than that of zonal soils. The element hyper-geochemical features also showed the same regularity because of the lower degrees of relative enrichment of Al, Fe and Mn and leaching of K,Mg, Ca and Na in Vertisols. On account of the montmorillonites being over 35% of the clay minerals and a special microstructure, Vertisols had a very high swell-shrink potential with the swell-shrink value and COLE being 40% and 0.09 respectively. Meanwhile, high swell-shrink potential leads to the formation of unique micromorphology features, such as voids being mainly fissures, hairline cracks and plasma separations including asepic, insepic, masepic, lattisepic, vosepic and skelsepic. The results obtained showed that profiles belong to Vertisols, Ferrasols and Anthropic Soils, respectively, according to the Chinese Soil Tixonomic Classification, and some profiles of the latter two soil orders maybe fall into the vertic subgroup. Some delimiting standards of orders, suborders and great groups of Vertisol and vertic soils are suggested.

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Qiu Rongliang, Xiong Dexiang, Huang Ruica. GENESIS AND TAXONOMIC CLASSIFICATION OF VERTISOLS IN YUNNAN-GUANGXI REGION OF CHINA[J]. Acta Pedologica Sinica,1994,31(4):385-395.

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  • Received:
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  • Online: February 25,2013
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