R/fT.Century2.R

In SoilR: Models of Soil Organic Matter Decomposition

#' Effects of temperature on decomposition rates according the the CENTURY
#' model
#' 
#' Calculates the effects of temperature on decomposition rates according to
#' the CENTURY model.
#' 
#' 
#' @param Temp A scalar or vector containing values of temperature for which
#' the effects on decomposition rates are calculated.
#' @param Tmax A scalar defining the maximum temperature in degrees C.
#' @param Topt A scalar defining the optimum temperature for the decomposition
#' process in degrees C.
#' @return A scalar or a vector containing the effects of temperature on
#' decomposition rates (unitless).
#' @references Adair, E. C., W. J. Parton, S. J. D. Grosso, W. L. Silver, M. E.
#' Harmon, S. A. Hall, I. C. Burke, and S. C. Hart. 2008.  Simple three-pool
#' model accurately describes patterns of long-term litter decomposition in
#' diverse climates. Global Change Biology 14:2636-2660.
fT.Century2<-structure(
  function 
    (Temp,     
     Tmax=45,   
     Topt=35   
     )
   {
      3.439423*exp((0.2/2.63)*(1-(((Tmax-Temp)/(Tmax-Topt))^2.63))*((Tmax-Temp)/(Tmax-Topt))^0.2)
    }
    ,
    ex=function(){
      Temperature=0:50
      plot(Temperature,fT.Century2(Temperature),type="l",
           ylab="f(T) (unitless)",
           main="Effects of temperature on decomposition rates according to the Century model")
    }
)