sunML: Sunlit shaded multi-layer model

In serbinsh/biocro: Simulation of Energycane and Sugarcane

Description

Simulates the light microenvironment in the canopy based on the sunlit-shade model and the multiple layers.

Usage

  sunML(I.dir, I.diff, LAI = 8, nlayers = 8, kd = 0.1,
    chi.l = 1, cos.theta = 0.5)

Arguments

I.dir	direct light (quantum flux), (micro mol /m2/s).
I.diff	indirect light (diffuse), (micro mol /m2/s).
LAI	leaf area index, default 8.
nlayers	number of layers in which the canopy is partitioned, default 8.
kd	extinction coefficient for diffuse light.
chi.l	The ratio of horizontal:vertical projected area of leaves in the canopy segment.
cos.theta	cosine of theta, solar zenith angle.

Value

a list structure with components

Vectors size equal to the number of layers.

Examples

res2 <- sunML(1500,200,3,10)

xyplot(Fsun + Fshade ~ c(1:10), data=res2,
       ylab='LAI',
       xlab='layer',
       type='l',lwd=2,col=c('blue','green'),
       lty=c(1,2),
       key=list(text=list(c('Direct','Diffuse')),lty=c(1,2),
                cex=1.2,lwd=2,lines=TRUE,x=0.7,y=0.5,
                col=c('blue','green')))

serbinsh/biocro documentation built on May 29, 2019, 6:57 p.m.