Features of Microstructure of Diagnostic Horizons and Lower Categorical Classification of Stagnic Anthrosols in Chengdu Plain

Several representative soil series, attributing to same soil subgroup, were selected out in Stagnic Anthrosols distributing extensively in Chengdu Plain. Soil micromorphological features of diagnostic horizons of soil series were studied, and soil properties in micromorphology were pointed out to identify soil series and the soil family to which the soil series belong, e.g. soil particles, soil minerals, soil structure, and soil formations, etc. The results showed that soil micromorphological features of the diagnostic horizons could comprehensively, distinctively, and exactly reveal the soil properties for taxonomic classification and provide the information of soil productivity. Consequently, lower categorical classification within soil taxonomic classification and its application into practice were important theoretically and technically.