Water relations and Energy balance

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Presentation transcript:

Water relations and Energy balance

Ψ=Water potential Ψ = Ψ π + Ψ p + Ψ m + Ψ g Ψ π = osmotic potential Ψ p= pressure potential Ψ g= gravitational potential Ψ m= matric potential

Water potential -13.7 Mpa, (50 % relative humidity) -2.3 -1.9 -1.5 -0.1 (moist soil)

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Whole-plant adaptations to low water availability Drought avoidance Drought deciduous Drought tolerant

Anatomical and morphological adaptations Leaf size and shape Stomata properties Characteristics of the cuticle Pubescence Vascular tissue Roots

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Energy balance Short wave radiant energy Long wave radiant energy Convection Leaf boundary layer Latent heat Conduction

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Energy Balance Rn = the net amount of radiant heat energy H the sensible heat (conduction +convection) loss λE = latent heat loss

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