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Study on the theory and method of mapping on small scales



Study on the theory and method of mapping on small scales



Acta Pedologica Sinica 25(4): 336-348



In this paper, soil cartography is considered to study and express the forms of structure of soil mantle distribution in space. The principle that soil mapping should be based on the genesis of soil combination and the method that attention should be paid on both simple delineation and compound delineation that can promote the quatified degree have been suggested. It also deals with the components of soil mapping units, the bases of their determination, the corresponding categories of soil classification, and the grades and arrangement of soil mapping unit system, as well as the relationship and differences between soil mapping unit and soil classification unit. Having generalized the structural forms of both simple and compound delineations and their forming factors, ideas of classification and examples are formulated first on division of the compound delineations into forming factor sequences such as those of relief, parent material, historical evolution, and cultivation, and then on subdivision into numerous types under each of the above forming factor sequences according to the genetic relations among the components of soil combination, as shown by the combination of delineations, the regularity of the geographic distribution of the soils in China has been discussed, in addition, the significance of mapping generalization in the soil mapping on small scales, the ways of generalization, points for attention, and the prospects for the small scale soil mapping have also been discussed.

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Accession: 007840831

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