OCSKGM: Soil organic carbon stock

Description Usage Arguments Value Note Author(s) References Examples

View source: R/OCSKGM.R

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

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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

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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

GSIF documentation built on May 31, 2017, 4:57 a.m.

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