Rb z

Oc>1 is the sensible heat flux the canopy layer i

Ov>1 is the latent heat flux for the vegetation layer i inside the oasis

®r-net, i flux of net radiation received by the vegetation layer i pcp is the volumetric heat capacity of air,

Y is the psychrometric constant,

Ti,i is the temperature of the leaves corresponding to canopy layer i

Tai is the temperature of the air corresponding to canopy layer i e(Tli) is water vapour pressure of the air at the canopy layer i for Tli e(Tai) is the water vapour pressure of the air at the canopy layer i Tai r c,i r v,i. is resistance to sensible heat flux for the layer (i) inside the oasis r vi. is resistance to sensible latent flux for the layer (i) inside the oasis rbi is the aerodynamic resistance of the boundary layer around the leaves in layer i

LAIi is leaf area index for the layer i rs1 and rs2 are stomata resistance for the superior and the inferior face of the leaves rs,i the mean stomata resistance for the vegetation layer (i ) inside the oasis

P is an a-dimensional coefficient equal to 3.77 10-3

Di is the water vapour pressure deficit of the air for canopy layer i l is the leaf width, u (z) is the wind velocity at level z a0 is a constant coefficient

The gross daily photosynthetic production of the whole canopy can be estimated from the following simple empirical formula (De-Xing and Coughenour, 1994):

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