关键词: 土壤系统分类, 砂质新成土, 分类检索

Abstract: Based on the diagnostic horizons and diagnostic characteristics, with soil genetic theory as guide, the taxonomic classification of sandic entisols in China was discussed in this paper. Sandic entisols refer to the soils having lithologic characteristics of sandy deposits within entisol order, which are equivalent to the past aeolian sandy soils in China. It was the soils that developed on the aeolian sandy parent materials and its depth of control section was 1~2 m. The formation of sandic entisols could be divided into three stages: (1) mobile sandy soil stages; (2) semifixed sandy soil stages, and (3) fixed sandy soil stages. Meanwhile it had the following characteristics in the soil-forming processes: (1) fine-particle soil accumulation; (2) soil crust formation; (3) organic matter accumulation. Five soil groups, Gecpsamment, Aqupsamment, Aripsamment, Ustpsamment and Udipsamment were identified within the sandic entisol suborder. Under the soil groups, according to whether a category of soils deviates from the central concept of a group, or if they had some characteristics resulting from additional processes, permagelic gecpsamment etc. amounting to 22 soil subgroups were further divided. The above divisions are listed in a retrieval system. In the end, taking the soil groups as units, the soil distribution, characteristics and reforming utilization of sandic entisols were discussed in the paper.

Key words: soil taxonomy, sandic entisols, keys to classification