117: average radiocarbon fraction weighted by carbonrelease

In SoilR: Models of Soil Organic Matter Decomposition

Description

Calculates the average radiocarbon fraction weighted by the amount of carbon release at each time step. (14R_1(t)+...+14R_n(t)) )/(R_1(t)+...R_n(t))) Where 14R_i(t) is the time dependent release of 14C of pool i and R_i(t) the release of all carbon isotops of pool i. Since the result is always in Absolute Fraction Modern format wie have to convert it to Delta14C

Arguments

object

an object

Value

A vector of length n with the value of FR for each time step.

Author(s)

Carlos A. Sierra, Markus Mueller

Examples

years=seq(1901,2009,by=0.5)
LitterInput=700 

Ex=TwopParallelModel14(t=years,ks=c(k1=1/2.8, k2=1/35),C0=c(200,5000), 
                       F0_Delta14C=c(0,0),In=LitterInput, gam=0.7,inputFc=C14Atm_NH,lag=2)
R14m=getF14R(Ex)
C14m=getF14C(Ex)
C14t=getF14(Ex)

par(mfrow=c(2,1))
plot(C14Atm_NH,type="l",xlab="Year",ylab="Delta 14C (per mil)",xlim=c(1940,2010)) 
lines(years, C14t[,1], col=4)
lines(years, C14t[,2],col=4,lwd=2)
legend("topright",c("Delta 14C Atmosphere", "Delta 14C pool 1", "Delta 14C pool 2"),
       lty=c(1,1,1),col=c(1,4,4),lwd=c(1,1,2),bty="n")

plot(C14Atm_NH,type="l",xlab="Year",ylab="Delta 14C (per mil)",xlim=c(1940,2010)) 
lines(years,C14m,col=4)
lines(years,R14m,col=2)
legend("topright",c("Delta 14C Atmosphere","Delta 14C SOM", "Delta 14C Respired"),
       lty=c(1,1,1), col=c(1,4,2),bty="n")
par(mfrow=c(1,1))

SoilR documentation built on May 4, 2017, 9:08 p.m.