# 133: Effects of moisture on decomposition rates according to the... In SoilR: Models of Soil Organic Matter Decomposition

## Description

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

## Usage

 `1` ```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

 ```1 2 3 4 5 6``` ```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.