SoilR (version 1.1-23)

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

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")