R/fT.Century1.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 Burke, I. C., J. P. Kaye, S. P. Bird, S. A. Hall, R. L.
#' McCulley, and G. L. Sommerville. 2003.  Evaluating and testing models of
#' terrestrial biogeochemistry: the role of temperature in controlling
#' decomposition.  Pages 235-253 in C. D. Canham, J. J. Cole, and W. K.
#' Lauenroth, editors. Models in ecosystem science. Princeton University Press,
#' Princeton.
fT.Century1<-structure(
  function 
    (Temp,     
     Tmax=45,   
     Topt=35   
     )
   {
      (((Tmax-Temp)/(Tmax-Topt))^0.2)*exp((0.2/2.63)*(1-((Tmax-Temp)/(Tmax-Topt))^2.63))
    }
    ,
    ex=function(){
      Temperature=0:50
      plot(Temperature,fT.Century1(Temperature),type="l",ylab="f(T) (unitless)",
           main="Effects of temperature on decomposition rates according to the Century model")
    }
)