| The classification of paddy soils in Guizhou province is mainly used soil genesis and classification as classification method,there are few studies on the classification of the system, which are in line with international standards.This study will analyze the soil forming process of yellow paddy soil,establishing the index system applicable to the yellow paddy soil’s characteristics and diagnostic characteristics in Guizhou and providing scientific basis for further development of the paddy soil system classification.In this research,we take the submergic, waterloggogenic, Gleyed yellow paddy soil which derived from sandstone, shale and Quaternary red clay matrix in Guizhou as the research object, through cross-sectional field describing and indoor paddy soil physical and chemical properties analyzing to study the characteristics of paddy soils occur.Based on "the Chinese Soil Taxonomy retrieval(Third Edition) " and "Chinese soil system classification and Tu and the soil series classification established principles and standards(Trial draft)" and "the Guizhou soil species newly ",analyzed and identified the diagnosis and characteristics of paddy soil,Eexplored its advanced unit in the home system Classification,established it’s soil families and series index system,accumulated basic information for the basic classification and the characteristic study of Guizhou yellow paddy soil.Research results show that:The color of the tested soil was 2.5Y, 7.5YR.The surface layer thickness is greater than 25 cm,the structure was mainly granular, soil thickness are about100 cm,the thickness of gleyed paddy soil and submergic paddy soil is relatively shallow.The tested soil’s soil color,clay content,profile average silt clay ratio, viscosity ratio, organic matter, CEC, free iron, iron complex, no amorphous iron, silicon and other effective indicators all shows that the degree of development of paddy soil from strong to weak, for the degree of retention of sterility in Paddy Soils strong Submerged Paddy Soil.Acidic soil, soil acidification is obvious; soil organic matteraccumulation significantly, the average content is 36.31g/kg.Soil free iron and amorphous iron has a trend from surface to bottom,whereas amorphous iron and chelated iron content in the profile decreases with increasing depth.The content of available silicon in soil at the level of general and high content, waterloggogenic paddy soil available silicon content is higher than submergic and gleyed paddy soil.The diagnostic level and diagnostic characteristics index in "Chinese Soil Taxonomy Retrieval(third edition)" can reflect the characteristics of paddy soil.This study added 1 acidic features.It concluded that horizons and diagnostic characteristics of the tested soils occur by the occurrence feature analysis are:1 diagnostic surface, i.e.the surface water;2 diagnostic table below, namely Hydragric surface layer, clay layer;7 diagnostic features that soil moisture conditions, soil temperature conditions,characterized by incubation redox characteristics, features iron, base saturation, acidic characteristics.Based on "Establishing Principles and Standards(trial version) and Chinese Soil Taxonomy Turkish soil series based" and " the Guizhou soil species newly" combined with the results of this paper,established the yellow paddy soil and soil series classification index system,The test soil was divided into 10 soil families and 10 soil series. |
