SoilR (version 1.0-0)

fW.Daycent1: Effects of moisture on decomposition rates according to the DAYCENT model

Description

Calculates the effects of Soil Water Content on decomposition rates according to the Daycent Model.

Usage

fW.Daycent1(swc, a = 0.6, b = 1.27, c = 0.0012, d = 2.84, partd = 2.65, 
    bulkd = 1, width = 1)

Arguments

swc

A scalar or vector with soil water content of a soil layer (cm).

a

Empirical coefficient. For fine textured soils a = 0.6. For coarse textured soils a = 0.55.

b

Empirical coefficient. For fine textured soils b = 1.27. For coarse textured soils b = 1.70.

c

Empirical coefficient. For fine textured soils c = 0.0012. For coarse textured soils c = -0.007.

d

Empirical coefficient. For fine textured soils d = 2.84. For coarse textured soils d = 3.22.

partd

Particle density of soil layer.

bulkd

Bulk density of soil layer (g/cm^3).

width

Thickness of a soil layer (cm).

Value

• A data frame with values of water filled pore space (wfps) and effects of soil water content on decomposition rates. Both vectors are unitless.

References

Kelly, R. H., W. J. Parton, M. D. Hartman, L. K. Stretch, D. S. Ojima, and D. S. Schimel (2000), Intra-annual and interannual variability of ecosystem processes in shortgrass steppe, J. Geophys. Res., 105.

Examples

swc=seq(0,0.8,by=0.01)  # A sequence of values of soil water content
fine=fW.Daycent1(swc)
coarse=fW.Daycent1(swc,a=0.55,b=1.7,c=-0.007,d=3.22)

#This plot reproduces Figure 2b in Kelly et al. (2000)
plot(fine,type="l",xlim=c(0,1))
lines(coarse,lwd=2)
legend("topleft",c("coarse","fine"),lty=c(1,1),lwd=c(2,1),bty="n")