Shrink - Swell Characteristics of Soils 1994

The 1994 State Soil Geographic (STATSGO) database for Indiana, obtained from the U.S. Department of Agriculture (USDA), Natural Resources Conservation Service (NRCS), was used to create SOILS_STATSGO_SHRINK_SWELL_IN showing the shrink-swell characteristics of soils in Indiana. The most restrictive shrink-swell characteristic of the soil layer was used to represent the component soil. The component soil values were then assigned to a map unit based on the percentage of that component soil in the map unit. A category was calculated for the map unit based on the most restrictive category at the 70th percentile of the map unit.本研究采用美国农业部（U.S. Department of Agriculture, USDA）与自然资源保护服务局（Natural Resources Conservation Service, NRCS）发布的1994年印第安纳州土壤地理（State Soil Geographic, STATSGO）数据库，构建了SOILS_STATSGO_SHRINK_SWELL_IN数据集，用以展示印第安纳州土壤的胀缩特性。研究选取土壤层中限制性最强的胀缩特性作为对应组分土壤的表征指标，随后根据该组分土壤在图斑单元中的占比，将组分土壤的属性值赋值至对应图斑单元。最终基于图斑单元70百分位处的最强限制性类别，计算得到该图斑单元的胀缩特性类别。