Abstract:

To understand the distribution characteristics of the stagnic anthrosols in mountainous areas of southwest China and promote the quantitative soil classification, based on the analysis data of representative soil profiles obtained from soil investigation in Guizhou from 2015 to 2017, and combined with previous soil survey data in Guizhou, we studied the formation, taxonomic classification and geographical distribution of stagnic anthrosols in Guizhou and their relationship with the soil formation environments by applying the diagnostic classification method of Chinese soil taxonomy. The results show that: there are 4 groups of stagnic anthrosols in Guizhou (i.e, gleyi-, Fe-leachi-, Fe-accumuli-, and Hapli-stagnic anthrosols), and 11 subgroups of them are identified; the diagnostic horizons of Guizhou include “anthrostagnic epipedon”, “Fe-leachi-hydragric horizon”, “Fe-accumuli-hydragric horizon”, and “albic horizon”; the identified diagnostic characteristics include “gleyic fertures” and “secondary calcic accumulation”; the stagnic anthrosols in Guizhou has obvious characteristics of organic matter accumulation and clay vertical migration, and the soil pH value varies greatly. The topographic condition is the main factor that affects the differentiation in groups and subgroups of the stagnic anthrosols in Guizhou, the main soil groups are Fe-accumuli-stagnic anthrosols and Hapli-stagnic anthrosols.

Key words: Stagnic Anthrosols, Soil Formation, Taxonomic Classification, Diagnostic Horizon, Diagnostic Characteristics, Geographical Distribution