Soil carbon fractions for Great Plains Ecoregion of the United States

GPmeasuredfractions contains data on measured soil carbon fractions for 100 soil samples from the Great Plains ecoregion. Also included are mid infrared spectra for these samples. Fraction protocol followed Baldock et al (2013) Soil Research 1(8):561–576 (https://doi.org/10.1071/SR12374). GPsoilcarbonfraction file contains a dataset of approximately 1550 soil profiles with ~8000 individual horizons from the Great Plains ecoregion. Soil data include total organic carbon content, particulate organic carbon, mineral-associated (or humus) organic carbon, and resistant (or pyrogenic) organic carbon content, bulk density of the fine earth fraction, clay content, pH. GPS coordinates and a host of covariate data are included. Carbon fractions were estimated from mid infrared spectral models. Five stacked GeoTiff files contain 250 m resolution maps of soil organic carbon (SOC), particulate organic carbon (POC), mineral-associated organic carbon (MAOC), pyrogenic carbon (PyC) and bulk density of the fine earth fraction (BD) projected at six standard depths (1, 3.5, 7.5, 15, 25, 37.5, and 67.5 cm). Spatial data are from a quantile random forest model and the median estimate for each property is given. Methodological details can be found in the accompanying Biogeochemistry publication.