Table 12 Information about the regional dataset used to evaluate the soil P distribution simulated in our study (GPASOIL-v1.1).

Reference

^{Jolivet et al.63}

^{Jones et al.19}

^TFI64

Website

Data can be download from: https://doi.org/10.15454/QSXKGA

Data can be downloaded after a request at ESDA website⁸⁰: https://esdac.jrc.ec.europa.eu/content/lucas2015-topsoil-data

http://soiltest.tfi.org.

Spatial extent

France

Europe

Canada and USA

Years of sampling

1^st compaign of measurement (2002–2009)

2015

Different years were available in STS but we used the last year in common to GPASOIL-v1.1 and STS (i.e. 2015).

Soil layer

Value of the 1^st soil layer considered was used (this soil layer is not necessary exactly equal to 0–30 cm but very close to it)

0–0.2 m

Value for the top 0–0.3 m was computed by using the P concentration available for each soil layer within this horizon in STS.

Chemical extraction for P

Olsen P

Olsen P (information given in Tóth et al.⁸¹)

All measures were done using different P extraction method and then all data were converted to Bray and Kurtz P1 Equivalent.

Land-cover used to approach cropland and grassland

The categories “cropland” and “fruits” for the land-cover “occupation1” were used for our land-cover cropland. The category “grassland” was used for our land-cover “grassland”.

Categories “cropland” and “grassland” for the “main group of Land Cover” (LC0) were considered

Values are provided at county/province without distinction between cropland and grassland

Unit

gP₂O₅ (kg of soil)⁻¹

mgP (kg of soil)⁻¹

mgP (kg of soil)⁻¹

Treatments performed for comparison to our dataset

- change in projection

- average of all sites within 0.5 grid-cell (with average done separately for cropland and grassland)

- conversion in kgP ha⁻¹ by using the 0.5 resolution bulk density and volumetric fraction of coarse fragments used in our approach

- average of all sites within 0.5 grid-cell (with average done separately for cropland and grassland)

- conversion in kgP ha⁻¹ by using the 0.5 resolution bulk density and volumetric fraction of coarse fragments used in our approach

- depth average to compute 0–0.3 m value

- conversion in kgP ha⁻¹ by using the country-scale value of bulk density that we computed from the 0.5 resolution bulk density and volumetric fraction of coarse fragments used in our approach