Soil variables in a depth interval of 5 to 15 cm were obtained from Soilgrids (https://soilgrids.org/) for the 63 observed locations in the historical series analyzed by Krause et al. (2022). The R code used to download and process the soil data can be retrieved at https://github.com/mdkrause/VarComp-ME/blob/main/soil_data.R.
soilA data frame in tidy format with 504 observations on the following 5 variables:
Featuresoil variables, 8 levels
locationlocations, 63 levels (observed locations in the historical series)
Soil_Gridmean values of the soil variables (Feature)
LATlocation latitude
LONlocation longitude
Levels of Feature:
Bulk density of the fine earth fraction (cg/m\(^3\))
Cation Exchange Capacity of the soil (mmol(c)/kg)
Proportion of clay particles (< 0.002 mm) in the fine earth fraction (g/kg)
Total nitrogen (cg/kg)
Soil pH (pH\(\times\)10)
Proportion of sand particles (\(>\) 0.05 mm) in the fine earth fraction (g/kg)
Proportion of silt particles (\(\ge\) 0.002 mm and \(\leq\) 0.05 mm) in the fine earth fraction (g/kg)
Soil organic carbon content in the fine earth fraction (dg/kg)