Description Usage Arguments Value Examples
Simulates the light microenvironment in the canopy based on the sunlit-shade model and the multiple layers.
1 2 | sunML(Idir,Idiff,LAI=8,nlayers=8,cos.theta=0.5,kd=0.7,chi.l=1,heightf=3,
maxIdir = 2235, maxIdiff = 119)
|
Idir |
direct light (quantum flux), (micro mol /m2/s). |
Idiff |
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. |
cos.theta |
cosine of theta, solar zenith angle. |
kd |
extinction coefficient for diffuse light. |
chi.l |
The ratio of horizontal:vertical projected area of leaves in the canopy segment. |
heightf |
height factor. simple empirical relationship between LAI and height of a canopy. |
maxIdir |
Maximum direct irradiance |
maxIdiff |
Maximum diffuse irradiance |
a data.frame
structure with components
row number equal to the number of layers.
layIdir |
direct solar radiation. |
layIdiff |
difusse solar radiation. |
layItotal |
total solar radiation. |
layFsun |
proportion of the leaf area in each layer which is in direct light. |
layFshade |
proportion of the leaf area in each layer which is in indirect light. |
layHeight |
layer height. |
1 2 3 4 5 6 7 8 9 10 |
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