Spatial distribution patterns of soil texture types and profile configurations in Ningxia
Soil texture is a natural physical property of soil,which is influenced by various factors such as parent material,topography,land use types,and soil erosion during the soil formation process.The soil exhibits different texture profile configurations.In order to understand the profile configurations and their distribution patterns in the Ningxia Hui Autonomous Region,100 representative soil profiles were excavated,and a total of 209 layered(A+B)soil samples were collected by dividing the soil layers and testing their particle composition.The soil texture was classified according to the USA soil texture classification standard.The results are as follows:(1)The soil types in Ningxia include 10 types:silty loam(SIL),sandy loam(SL),loam(L),silty clay loam(SICL),clay loam(CL),loamy sand(LS),sandy(S),silt(SI),silty clay(SIC)and clay(C).SIL is the dominant texture type in both the A and B layers,followed by SL and L.(2)There are 12 types of soil profile configurations,with SIL-SIL being the dominant configuration(38％),followed by SL-SL(17％).Homogenous configurations account for 71％of all profile types,while loose above and compact below configurations account for 13％,and compact above and loose below configurations account for 16％.(3)SIL-SIL is the most typical soil profile configuration in Ningxia,mainly distributed in the southern region.L-L and L-SIL are mainly distributed in the northern and central regions.SL-SL and SL-SIL are mainly distributed in the central region.SICL-SICL and SICL-L are mainly distributed in the northern region.(4)The dominant profile configurations for typical soils are SL-SL and SIL-SIL for calcareous soils,SIL-SIL for loess soils,SICL-SICL for alluvial soils,SIL-SIL and L-SIL for gray-brown soils,SIL-SIL and SICL-SICL for tidal soils,and SIL-SIL for black soils.Among the major soil types in Ningxia,black soils have a stable environment,and their profile configurations are homogenous.Except for alluvial and tidal soils with SICL-SICL as the dominant configuration,most other soils in the study area are dominated by SIL-SIL or SL-SL configurations,matching the local climate.(5)The distribution of soil profile configurations in the study area is mainly influenced by topography and altitude.In the northern region,the high clay content in the soil is due to the deposition from the Yellow River,resulting in SICL-SICL,SICL-L and SIL-SIL as the main configurations.
万方数据
维普
