Only a few of the soil profiles, formed under irepical, subtropical, or cold temperate conditions are characterized by the formation of iron layer. In the former cases, soils formed under tropical and subtropical conditions, the iron layer situates on top of the profile and is called as iron crust. In the later case, sails formed under cold temperate conditions, the iron layer lies in the middle of the profile which is naturally a well developrd podsol,and is called as iron pan. But, all of these are unlike those of Fukien Soils.
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刘海蓬.福建省土壤剖面中之聚铁层[J].土壤学报,1948,0(1):43-49. W. H. Liu. The Formation of Iron Crust in the Soil Profiles of Fukien, China[J]. Acta Pedologica Sinica,1948,0(1):43-49.