robCompositions (version 2.1.0)

gemas: GEMAS geochemical data set

Description

Geochemical data set on agricultural and grazing land soil

Usage

data(gemas)

Format

A data frame with 2108 observations and 30 variables

Details

• COUNTRY country name

• longitude longitude in WGS84

• latitude latitude in WGS84

• Xcoord UTM zone east

• Ycoord UTM zone north

• MeanTempAnnual mean temperature

• AnnPrec Annual mean precipitation

• soilclass soil class

• sand sand

• silt silt

• clay clay

• Al Concentration of aluminum (in mg/kg)

• Ba Concentration of barium (in mg/kg)

• Ca Concentration of calzium (in mg/kg)\

• Cr Concentration of chromium (in mg/kg)

• Fe Concentration of iron (in mg/kg)

• K Concentration of pottasium (in mg/kg)

• Mg Concentration of magnesium (in mg/kg)

• Mn Concentration of manganese (in mg/kg)

• Na Concentration of sodium (in mg/kg)

• Nb Concentration of niobium (in mg/kg)

• Ni Concentration of nickel (in mg/kg)

• P Concentration of phosphorus (in mg/kg)

• Si Concentration of silicium (in mg/kg)

• Sr Concentration of strontium (in mg/kg)

• Ti Concentration of titanium (in mg/kg)

• V Concentration of vanadium (in mg/kg)\

• Y Concentration of yttrium (in mg/kg)

• Zn Concentration of zinc (in mg/kg)

• Zr Concentration of zirconium (in mg/kg)

• LOI Loss on ignition (in wt-percent)

The sampling, at a density of 1 site/2500 sq. km, was completed at the beginning of 2009 by collecting 2211 samples of agricultural soil (Ap-horizon, 0-20 cm, regularly ploughed fields), and 2118 samples from land under permanent grass cover (grazing land soil, 0-10 cm), according to an agreed field protocol. All GEMAS project samples were shipped to Slovakia for sample preparation, where they were air dried, sieved to <2 mm using a nylon screen, homogenised and split to subsamples for analysis. They were analysed for a large number of chemical elements. In this sample, the main elements by X-ray fluorescence are included as well as the composition on sand, silt, clay.

References

Reimann, C., Birke, M., Demetriades, A., Filzmoser, P. \& O'Connor, P. (Editors), 2014. Chemistry of Europe's agricultural soils - Part A: Methodology and interpretation of the GEMAS data set. Geologisches Jahrbuch (Reihe B 102), Schweizerbarth, Hannover, 528 pp. + DVD Reimann, C., Birke, M., Demetriades, A., Filzmoser, P. & O'Connor, P. (Editors), 2014. Chemistry of Europe's agricultural soils - Part B: General background information and further analysis of the GEMAS data set. Geologisches Jahrbuch (Reihe B 103), Schweizerbarth, Hannover, 352 pp.

Examples

# NOT RUN {
data(gemas)
str(gemas)
## sample sites
# }
# NOT RUN {
require(ggmap)
map <- get_map("europe", source = "stamen", maptype = "watercolor", zoom=4)
ggmap(map) + geom_point(aes(x=longitude, y=latitude), data=gemas)
map <- get_map("europe", zoom=4)
ggmap(map) + geom_point(aes(x=longitude, y=latitude), data=gemas, size=0.8)
# }