Evapotranspiration and its components (evaporation and
transpiration) as a process is one of the basic terms of Earth's
water balance; its importance is accented by the fact that
transpiration is the vital element of the biomass production
process. The second important property of evapotranspiration is its
extreme consumption of solar energy, thus controlling the
temperature of the atmosphere and creating favourable conditions
for life. Evapotranspiration as an energy consuming process is also
the connection between the energy and mass cycles of the Earth.
Evapotranspiration is a process performing in the Soil-Plant
-Atmosphere System (SPAS); therefore this book is presenting and
quantifying it as a catenary process, describing transport of water
in the soil, including root extraction patterns and methods of its
evaluation. Transport of water through the plant and from the
canopy to the atmosphere is also described and quantified. A
variety of evapotranspiration (and its components evaporation and
transpiration) calculation methods are described, starting from
empirical methods up to the most sophisticated ones based on the
solution of the transport equations of water and energy in the
SPAS. The most important (and widely used) calculation method -
modified Penman-Monteith method is described in details, ready to
be used with data in the book only. Water balance method of
evapotranspiration estimation as well as sap flow method
description can be found in the book as well. The book can be used
by hydrologists, biologists, meteorologists and other specialists
as well as byecology students.
Key themes: soil hydrology - evapotranspiration - hydropedology-
plant physiology -water movement in soils -evaporation
-transpiration
Dr. Viliam Novak isa water resources scientist at the Institute
of Hydrology of the Slovak Academy of Sciences in Bratislava
(Slovakia)."
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