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

In SoilR: Models of Soil Organic Matter Decomposition

Description

Calculates the effects of moisture on decomposition rates according to the StandCarb model.

Usage

fW.Standcarb(Moist, MatricShape = 5, MatricLag = 0, MoistMin = 30, 
    MoistMax = 350, DiffuseShape = 15, DiffuseLag = 4)

Arguments

Moist	A scalar or vector containing values of moisture content of a litter or soil pool (%).
MatricShape	A scalar that determines when matric limit is reduced to the point that decay can begin to occur.
MatricLag	A scalar used to offset the curve to the left or right.
MoistMin	A scalar determining the minimum moisture content.
MoistMax	A scalar determining the maximum moisture content without diffusion limitations.
DiffuseShape	A scalar that determines the range of moisture contents where diffusion is not limiting.
DiffuseLag	A scalar used to shift the point when moisture begins to limit diffusion.

Value

A data frame with limitation due to water potential (MatricLimit), limitation due to oxygen diffusion (DiffuseLimit), and the overall limitation of moisture on decomposition rates (MoistDecayIndex).

Author(s)

Carlos A. Sierra <[e-mail]>, Markus Mueller <[e-mail]>

References

Harmon, M. E., and J. B. Domingo (2001), A users guide to STANDCARB version 2.0: A model to simulate carbon stores in forest stands. Oregon State University, Corvallis.

Examples

MC=0:500
DeadFoliage=fW.Standcarb(MC)
DeadBranch=fW.Standcarb(MC,MoistMax=200)
DeadWood=fW.Standcarb(MC,MoistMax=150)
StableSoil=fW.Standcarb(MC,MoistMin=15,MoistMax=100)
plot(MC,DeadFoliage$MoistDecayIndex,type="l",xlab="Moisture Content (%)",
     ylab="f(W) (unitless)",
     main="Effects of moisture on decomposition rates according to the StandCarb model")
lines(MC,DeadBranch$MoistDecayIndex,col=4)
lines(MC,DeadWood$MoistDecayIndex,col=3)
lines(MC,StableSoil$MoistDecayIndex,col=2)
legend("topright",c("Dead Foliage","Dead Branch","Dead Wood","Stable Soil"),
       lty=c(1,1,1),col=c(1,4,3,2),bty="n")

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