Noise-induced phenomena in environmental systems - Noise-induced Phenomena in the Environmental Sciences - page 129

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Figure 4.16. Soil-water balance at a point expressed in terms of depth-average soil
moisture s in the root zone Z r .

χ = E

s L s

E K s

E

E

w

s

s

s

s h s w

Figure 4.17. Schematic representation of the dependence of evapotranspiration and
leakage losses on soil moisture s . Leakage occurs only when soil moisture exceeds
field capacity s fc . Transpiration is not limited by s for s

s ∗ plants are
in a state of water stress and transpiration is a decreasing function of s . Transpiration
is zero when s is smaller than the wilting point s w .For s ranging between the
hygroscopic point s h and the wilting point s w , soil evaporation is the only contributor
to soil-moisture losses.

s ∗ .For s

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