Study On Soils Series Classification Of The Purple Soils In Sichuan Basin

Under the direction of Chinese Soil Taxonomy ,part purple soils developed on the purplish standstones of J2#J3 in Sichuan Basin were systematically studiedAccording to natural landscape,profile modality and quick-test,Applying to methods statistic analysis and system integration,main affecting factors, indexs of soil series taxonomy and retrieval orders were systematically discussed.The results showed:1) Organic substance,total nityogen , total phosphate , total potassium and particle size composition were distinctly related with many soil characters.Organic substance, calciumcarbonate , available phosphate# size composition were much different in all swatches.Besides,soil structure and the depth had profound affection to it.2) Affecting factors:soil structure, texture style and organic substance phosphorous.3) Indexs of soil series taxonomy and retrieval orders:a) Soil structure:The classification was based on the soil profile and "B" horizon differentiation.b) Texture style.c) Organic substance:According to four levels 20.1-30.0, 10.1-20.0, 6.1-10.0, <6.0(g/kg)4) According to the standard of Chinese soil Taxonomy and this study, 17 soil swatches were divided into 14 soil series.Among which,9 belonged to cambic order,the order 7 belonged to entic order.