133: Effects of moisture on decomposition rates according to the...

Description Usage Arguments Value Author(s) References Examples

Description

Calculates the effects of moisture (precipitation and pan evaporation) on decomposition rates according to the RothC model.

Usage

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fW.RothC(P, E, S.Thick = 23, pClay = 23.4, pE = 0.75, bare = FALSE)

Arguments

P

A vector with monthly precipitation (mm).

E

A vector with same length with open pan evaporation or evapotranspiration (mm).

S.Thick

Soil thickness in cm. Default for Rothamsted is 23 cm.

pClay

Percent clay.

pE

Evaporation coefficient. If open pan evaporation is used pE=0.75. If Potential evaporation is used, pE=1.0.

bare

Logical. Under bare soil conditions, bare=TRUE. Dafault is set under vegetated soil.

Value

A data.frame with accumulated top soil moisture deficit (Acc.TSMD) and the rate modifying factor b.

Author(s)

Carlos A. Sierra <csierra@bgc-jena.mpg.de>, Markus Mueller <mamueller@bgc-jena.mpg.de>

References

Coleman, K., and D. S. Jenkinson (1999), RothC-26.3 A model for the turnover of carbon in soil: model description and windows user guide (modified 2008), 47 pp, IACR Rothamsted, Harpenden.

Examples

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P=c(74,59,62,51,52,57,34,55,58,56,75,71) #Monthly Precipitation (mm)
E=c(8,10,27,49,83,99,103,91,69,34,16,8)  #Monthly open pan evaporation (mm)

Rothamsted=fW.RothC(P,E)
data.frame(month.name,P,E,0.75*E,P-0.75*E,Rothamsted)  
# This reproduces Table 1 in the RothC documentation (Coleman and Jenkinson 1999)

SoilR documentation built on May 1, 2019, 8:06 p.m.