The original data were obtained from the world soil properties database WISE30sec produced by the International Soil Reference and Information Centre (ISRIC) (N.H. Batjes, 2016; DOI:10.1016/j.geoderma.2016.01.034). The soil type GIS dataset was created using the HWSD (version 1.21) soil map units with minor corrections and overlaying world map of Köppen-Geiger classification climate as classification covariates, and soil properties data is from the ISRIC-WISE soil profile database, containing 21,000 soil profiles.Compared to the HWSD (v1.2)database, WISE30sec quantifies the uncertainty in soil properties (standard deviation) by adding four soil properties with a finer soil stratification: 0-20cm, 20-40cm, 40-60cm, 60-80cm, 80-100cm, 100-150cm, 150-200cm.The original WISE30sec soil database mainly comprises the soil type raster file (wise_30sec_v1.tif) and the soil properties Access database file (WISE30sec.mdb).
To be easier to use the original data, we re-read the WISE30sec.mdb file in R language, obtained the 20 soil properties and their uncertainty (standard deviation) attribute tables, used the soil type linkage method (Linkage method) to link each soil property data to the soil type raster file wise_30sec_ v1.tif with NEWSUID as the identifier, using the idea of partitioned parallel calculation, and finally merging the output into GeoTIFF files and clipping them by China area.This dataset contains a total of 20 soil properties and their standard deviations in 7 layers, with 280 raster files. File naming rules: "BULK_std_0-20cm.tif", BULK means soil capacity, std means uncertainty of soil capacity (standard deviation), 0-20cm means soil depth. This dataset can be used for resource and environmental assessment directly and comparative fusion of soil products from different sources, and provides input parameters for model-driven hydrological, biogeochemical and land surface processes, serving ecological agricultural zoning and food security.
WISE30sec soil database of International Soil Reference and Information Centre (ISRIC)（Batjes NH，2016）.
Linkage method
Re-read the WISE30sec.mdb file in R language, collate the soil properties at different depths in the original data database file, obtain a table of 20 soil properties and their uncertainty (standard deviation, std) properties, use the soil type linkage method (Linkage method) to link the soil property data at each of the 7 depths with the NEWSUID as the identifier to Soil type raster file wise_30sec_v1.tif, using the idea of partitioning parallel computing, performing data type conversion, and finally merging the output into a GeoTIFF file and clipping it to the China region (code attached).
The data are in good quality and the meanings of the variables are as follows:
CFRAG Gravel content greater than 2mm diameter (%, % by volume)
CFRAG STD Standard deviation of gravel content >2mm diameter (% by volume)
SDTO Sand content (% by mass)
SDTO STD Standard deviation of sand content (% by mass)
STPC Fines content (% by mass)
STPC STD Standard deviation of fines content (% by mass)
CLPC Clay content (% by mass)
Standard deviation of CLPC STD mucilage content (% by mass)
BULK Bulk weight (g cm-3)
BULK STD Standard deviation of bulk weight (g cm-3)
TAWC Effective soil water content (cm m-1)
TAWC STD Standard deviation of effective soil water content (cm m-1)
CECs Soil cation exchange capacity (cmolc kg-1)
CECs STD Soil cation exchange standard deviation (cmolc kg-1)
TEB Total soil exchangeable salt group (cmolc kg-1)
TEB STD Standard deviation of total soil exchangeable salts (cmolc kg-1)
BSAT Soil salinity saturation (%)
BSAT STD Standard deviation of soil salinity saturation (%)
CECc Cation exchange capacity of soil clay particles (cmolc kg-1)
CECc STD Standard deviation of cation exchange of soil clay particles (cmolc kg-1)
ECEC Effective cation exchange capacity of soil (cmolc kg-1)
ECEC STD Standard deviation of effective cation exchange in soil (cmolc kg-1)
ESP Soil exchangeable sodium as a percentage of CEC (%)
ESP STD Soil exchangeable sodium as a percentage of CEC standard deviation (%)
ALSA Soil exchangeable aluminium (% of ECEC)
ALSA STD Soil exchangeable aluminium (% of ECEC) Standard deviation
PHAQ Soil pH (water leaching)
PHAQ STD Soil pH standard deviation
TCEQ Soil inorganic carbon content (g C kg-1)
TCEQ STD Standard deviation of soil inorganic carbon content (g C kg-1)
GYPS Soil gypsum content (g C kg-1)
GYPS STD Standard deviation of soil gypsum content (g C kg-1)
ELCO Soil conductivity (dS m-1)
ELCO STD Standard deviation of soil conductivity
ORGC Soil organic carbon content (g C kg-1)
ORGC STD Standard deviation of soil organic carbon content (g C kg-1)
TOTN Total soil nitrogen content (g kg-1)
TOTN STD Standard deviation of total soil nitrogen content (g kg-1)
CNrt Soil carbon to nitrogen ratio
CNrt STD Standard deviation of soil carbon to nitrogen ratio
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CSTR:11738.11.NCDC.QLSST.DB2702.2023
10.12072/ncdc.qlsst.db2702.2023