OCSKGM {GSIF}R Documentation

Soil organic carbon stock

Description

Derive soil organic carbon stock / storage (in kilograms per square-meter) and propagated uncertainty for a given horizon/solum depth and based on soil organic carbon concentration, horizon/solum thickness, bulk density and percentage of coarse fragments.

Usage

OCSKGM(ORCDRC, BLD=1400, CRFVOL=0, HSIZE, 
     ORCDRC.sd=10, BLD.sd=100, CRFVOL.sd=5, se.prop=TRUE)

Arguments

ORCDRC

numeric; soil organic carbon concentration in permille or g / kg

BLD

numeric; bulk density in kg / cubic-meter for the horizon/solum

CRFVOL

numeric; percentage of coarse fragments (above 2 mm in diameter) in the sample

HSIZE

numeric; thickness of the horizon/solum in cm

ORCDRC.sd

numeric; standard error of estimating ORCDRC (must be positive number)

BLD.sd

numeric; standard error of estimating BLD (must be positive number

CRFVOL.sd

numeric; standard error of estimating CRFVOL (must be positive number)

se.prop

logical; specifies whether to derive propagated error

Value

Soil organic carbon stock in kilograms per square-meter. To convert to tonnes per hectar multiply by 10.

Note

Propagated error (attached as an attribute) is estimated using the Taylor Series Method and shows only an approximate estimate. A more robust way to estimate the propagated uncertainty would be to use (geo)statistical simulations. See Heuvelink (1998) for more info.

Author(s)

Tomislav Hengl, Niels Batjes and Gerard Heuvelink

References

Examples

Area <- 1E4  ## 1 ha
HSIZE <- 30 ## 0--30 cm
ORCDRC <- 50  ## 5%
ORCDRC.sd <- 10  ## +/-1%
BLD <- 1500  ## 1.5 tonnes per cubic meter
BLD.sd <- 100  ## +/-0.1 tonnes per cubic meter
CRFVOL <- 10  ## 10%
CRFVOL.sd <- 5  ## +/-5%         
x <- OCSKGM(ORCDRC, BLD, CRFVOL, HSIZE, ORCDRC.sd, BLD.sd, CRFVOL.sd)
x  ## 20.25 +/-4.41 kg/m^2
## in tonnes per ha:
x[[1]] * Area / 1000

[Package GSIF version 0.5-3 Index]