Study On Soil Series Investigation Method In Plain Agricultural Areas Based On Soil-Landscape Relationship

The division of soil types helps us better understand the soil,clarify the properties of the soil,and it is also conducive to agricultural production and management,more conducive to the further resolution of population,ecological and environmental issues.China's soil system classification is based on the diagnostic layer and diagnostic characteristics,with systematic,quantitative and searchable soil classification system;different soil types based on soil attribute differences,for agricultural refinement and information management And the development and management of facility agriculture has an extremely important role.At present,the advanced classification units(soil,subclass,soil,sub-category)of soil system classification in China have been completed,and the Chinese Soil System Classification Search(third edition)has also been published.For soil in a particular area,we are able to retrieve it at the sub-category level through the diagnostic layer and diagnostic characteristics of the soil.In the grass-roots classification units(Tu and Earth),although we have made some achievements,we have already determined the classification criteria of soil basic classification units,field profile description and sampling specifications,laboratory analysis methods,etc.;The classified grassroots taxonomic units still lack systematic and search ability.Therefore,the future research of the soil system still needs further improvement.At home and abroad,great progress has been made in soil surveying and mapping techniques,but these applications are mostly based on digital soil mapping of certain attributes of soil,lacking the division of soil types,thus lacking guidance for agricultural production and management.Sex.In addition,in the soil survey,there is a lack of soil survey methods for soil surveys.Although there are soil survey techniques and methods based on soil system classification in China,most of them are based on sub-class soil survey methods,while the soil survey method for soil-based grass-roots taxonomy-seed only appears in the soil facing the hilly area.It is a survey method,but the soil survey method is still a blank for plain agricultural areas with little fluctuations in terrain and large impact on human activities.Therefore,with reference to the small-scale landscape classification and soil survey methods in the hilly area,this study takes a certain impact plain agricultural area in the middle part of the Qin Huai River as the study area.Based on the soil-landscape relationship and the characteristics of the soil system,the landscape factors affecting soil development are fully analyzed,and the landscape factors(including topographical factors,land use types and farming methods)in the study area are extracted,quantified and reconstructed.In this way,landscape classification and mapping are carried out,and the soil survey methods of plain agricultural areas are studied on the basis of quantitatively dividing landscape factors and landscape types.Soil types in the study area were classified by field soil survey and soil attribute data obtained from the laboratory,and the feasibility of soil survey methods based on quantitative classification of landscape factors and landscape types was verified.Research indicates:(1)According to the topography,land use type and farming method,the landscape classification is carried out.It is feasible to carry out the method of soil survey in the plain agricultural area on the basis of landscape classification.Through research,we found that topographical factors and land use patterns control the differentiation of soil advanced taxonomic units.Soil properties generally differ in the higher-level taxonomic units of soil,subclass and soil,ie different geomorphology.Different types of soils,sub-classes and soils may exist under the type and land use mode;long-term farming methods will also make the nature of the soil heterogeneous,which controls the differentiation of the soil base classification units.It is represented by the differentiation between the Turkish and soil-based taxa.(2)The landscape classification system in hilly areas still has certain practicability in the plain agricultural area,but the terrain in the hilly area is undulating.Different terrain types such as elevation and slope and land use types can be used to clearly distinguish different landscape types..In the plain area,due to its relatively flat terrain,the elevations are not much different.The terrain features of different landform types are narrower than the hilly areas.In addition,the soil in the plain agricultural area is greatly affected by human factors,the types of crop cultivation are diverse,the types of land use are variable,and the landscape differentiation is not obvious.Therefore,it is necessary to select a relatively stable land use situation for a longer period of time to further divide the landscape type.(3)Determination of the survey route and profile points of the plain agricultural area:compared with the traditional field soil survey method,with high-precision elevation map(5m × 5m),multi-temporal(multi-year,multi-view),high precision Remote sensing images(Google image 0.5m×0.5m),quantitatively classify and combine landscape factors,and construct different landscape units,so that the selection of soil survey routes and profile points have certain quantitative and different sampling routes.The landscape at the sampling point is somewhat heterogeneous,and more detailed landscape information can be obtained during soil surveys.According to different landscape factors and landscape types,the soil survey route and soil profile points can be used to quantitatively reflect the heterogeneity of soil properties under different soil sampling routes and different profile points.(4)The spatial extent of the distribution of the soil system is roughly the same as the spatial extent of the landscape unit of the landscape classification.The soil properties are different in different types of landscape phase units,which are different in the soil system;Within the type of landscape,although the soil properties show certain differences,the soil layer,diagnostic layer and diagnostic characteristics are identical.The depth and thickness of specific soil layers,surface soil texture,soil salinity,tuberculosis,and intrusion content are generally the same.Consistent,showing the same soil system.