The Application Of Chinese Soil Systematic Classification In Jixi City

In terrestrial ecosystems,the soil is a fundamental and most important part.Soil provides the material basis for human survival and development.Soil classification is the basis of soil science.As the carrier of soil information,soil classification provides effective reference for the extension and application of agricultural technology.Soil classification plays an important guiding role in agricultural production according to local conditions,rational utilization of soil resources and sustainable development of agriculture.Jixi City is located in the southeast border of Heilongjiang Province.It is rich in forestry and coal resources.As a resource-based city,Jixi is faced with the dilemma of resource reduction and the urgent problem of industrial transformation.Soil classification provides theoretical basis for urban construction and industrial transformation relying on resource development.In this study,16 representative soil profiles were collected from Jixi city,and the morphological characteristics of the soil profiles were standardized and sampled for basic physical and chemical properties.The diagnostic horizons and diagnostic characteristics were determined according to the Keys to Chinese Soil Taxonomy(Third Edition),and the subgroup were compared with the Soil genetic classification.The results of this study can provide scientific basis for further understanding of Chinese Soil Taxonomy and Soil genetic classification,and also provide reference for rational utilization and scientific management of soil resources in Jixi City.The main conclusions of this paper are as follows:(1)The 16 typical soil profiles in the study area had 4 diagnostic surface horizons: histic epipedon,mollic epipedon,ochric epipedon and anthrostagnic epipedon;3 diagnostic subsurface horizons: albic horizon,hydragric horizon,Largic horizon;8 diagnostic characteristics:organic soil materials(fibri、hemi and sapri)、L.C.of alluvial deposits、lithic contact、soil moisture regimes(udic、stagnic、anthrostagnic and aquic)、gleyic features、frigid temperature regime、n value、isohumic property;The soils in this paper were classified into 7 soil orders,9 suborders,10 groups and 12 subgroups in Soil Taxonomy.(2)According to the Soil geography of China(In Chinese),16 typical sections belong to 7subclasses of dark brown soil,white pulpy soil,meadow soil,marsh soil,peat soil,paddy soil and neoplast soil.According to the Keys to Chinese Soil Taxonomy(Third Edition),the test sections were divided into 7 soil orders: histosols,anthrosols,gleyosols,isohumosols,argosols,cambosols and primosols.The 12 subgroups are hemi fibric-orthic histosols、albi haplic-stagnic anthrosols、typi haplic-stagnic gleyosols、fibri histic-orthic gleyosols、albi argic-udic isohumosols、gleyi albic-boric argosols、molli albic-boric argosols、typi albic-boric argosols、typi dark-aquic cambosols、typi orhric-aquic cambosols、typi udic-alluvic primosols、lithi udic-orthic primosols.(3)The Chinese Soil Taxonomy of the 16 surveyed soils was referenced to the Soil genetic classification,with 12 subclasses of the Chinese Soil Taxonomy corresponding to 7 subclasses of Soil genetic classification.The hemi fibric-orthic histosols corresponds to low peat soil;albi haplic-stagnic anthrosols corresponds to flooded paddy soil.typi haplic-stagnic gleyosols corresponds to swamp soil subcategory,while fibri histic-orthic gleyosols corresponds to peat swamp soil.There are a wide range of corresponding types of albi argic-udic isohumosols,including subtype of leucoplasmic soil,meadow leucoplasmic soil and leucoplasmic meadow soil.The gleyi albic-boric argosols correspond to the gley leucosols,the molli albic-boric argosols correspond to the subclass of leucosols,and the typi albic-boric argosols correspond to the subclass of leucosols,the meadow leucosols,and the leucosols.The typi dark-aquic cambosols corresponds to humus swamp soil,and the typi orhric-aquic cambosols corresponds to white pulped meadow soil.The typi udic-alluvic primosols corresponds to the alluvial neosoil,while the lithi udic-orthic primosols corresponds to the dark brown soil subclass.It can be seen from the comparison results that there is no one-to-one correspondence between the Chinese Soil Taxonomy and the Soil genetic classification.