Plant water relations. Douglas R. Cobos, Ph.D. Decagon Devices and Washington State University. Plants fundamental dilemma . Biochemistry requires a highly hydrated environment (> -3 MPa ) Atmospheric environment provides CO 2 and light but is dry (-100 MPa ). Water potential.
Douglas R. Cobos, Ph.D.
Decagon Devices and Washington State University
Low water potential
Boundary layer conductance to water vapor flow
Stomatal conductance to water vapor flow
Root and xylem conductance to liquid water flow
High water potential
Leaf stomatal conductance
Soil water potential
Leaf/stem water potential
Stomatal conductance is proportional to:
ΔCv = change in water vapor concentration
Δt = change in time
More information on the theory of operation is available.