Study On Soils Series Classification Of The Main Stagnic Anthrosols In Chengdu Plain

Based on typical sample,soil survey,environment survey and soil physical-chemical analysis,under the direction of Chinese soil Taxonomy,according to the principle of stability,discrepancy,dominant and integration of soil series taxonomy,applying to methods of statistic analysis and system integration,the selection of indexes of soil series taxonomy of hydragric anthrosols in Chengdu plain soil series taxonomy soil series naming and index were systemically sturied. The results showed:(l)the main affectoi of hydragric anthrosols soil series in chengdu plain were:soil structure in 100cm soil depth;Fe2O3( DCB);the texture of hydragric epipedon(cultivation horizon);the proportion of clay and salt in hydragric epipedon(cultivation horizon). (2)the index of soil series taxonomy were:wheather there are the characterbsoil horizon (Apl Ap2 Br,G)in the soil of 100cm depth and the permataction and combination of the character soil horizon must be consided .if the the proportion of Fe2O3( DCB) in hydragric horizon and cultivation horizon 1.5;the texture of hydragric epipedon(cultivation horizon);the range of the proportion of clay and salt in hydragric epipedon(cultivation horizon)ware:<0.27. 0.28-0.54 0.55-0.74x 0.75-1.0 1.05. (3) the definition of soil series Applied the method of direct nomenclature(eg. Qingjiang series),searches of soil series was the order:soil structure - the texture of hydragric epipedon -the proportion of clay and salt (eg. Apl-Ap2-G-clay loam-0.54),10 typical soil sections were classified 10 soil series(eg.qingjiang series beihe series) and belonged to 5 subgroups and 4 groups of hydragric anthrosols.