The concept of potential evapotranspiration was put forth by thornthwaite 1948 and penman 1948. The fao penmanmonteith method is recommended as the method for determining reference et o. Since climate change will impact on soil water balance that leads to change in evaporation and plant transpiration. Factors that affect the rate of evapotranspiration include the amount of solar radiation, atmospheric vapor pressure, temperature, wind, and soil moisture.
The typical plant, including any found in a landscape, absorbs water from the soil through its roots. Kirkham, in principles of soil and plant water relations, 2005. Chapters concerning the calculation of the reference crop evapotranspiration et o. Different evapotranspiration calculation methods are used depending on the. Purchase evapotranspiration from plant communities, volume 1st edition. Evapotranspiration et is the sum of evaporation and plant transpiration from the earths land. The term potential evapotranspiration must be defined when we talk of evapotranspiration. Evaporation abstract in the first part of this experiment, the relationship between wind speed and evaporation is investigated.
This chapter introduces the user to the need to standardize one method to compute et o from meteorological data. The chapter uses the definition of rosenberg, noting that his definition is similar to that of penman. Evapotranspiration definition of evapotranspiration at. Potential evapotranspiration an overview sciencedirect. Evapotranspiration, loss of water from the soil both by evaporation from the soil surface and by transpiration from the leaves of the plants growing on it. This energy, known as the latent heat of vaporization l, is a function of the water temperature. Evapotranspiration definition of evapotranspiration by. Evapotranspiration is the combination of transpiration, the release of water through stomata.
Evapotranspiration definition, the process of transferring moisture from the earth to the atmosphere by evaporation of water and transpiration from plants. Evapotranspiration is the sum of evaporation from the land surface plus transpiration from plants. Potential reference evapotranspiration and evaporation. We measure the evaporation under idealized conditions using a small wind tunnel.
Test your understanding of evapotranspiration by completing this interactive quiz. That water is then used for metabolic and physiologic functions. An update for the definition of reference evapotranspiration. Concept and consequence of evapotranspiration for sustainable. Evapotranspiration an overview sciencedirect topics. This article provides a focused survey of progress in crop evapotranspiration et measurement and. Remote sensing and evapotranspiration mapping futurewater. Evapotranspiration from plant communities, volume 1st. Fao irrigation and drainage paper food and agriculture. We then compare our results from the experiment with calculated values for the evaporation over the sea. Evapotranspiration definition is loss of water from the soil both by evaporation and by transpiration from the plants growing thereon.
Evapotranspiration estimation methods in hydrological models. Land surface properties, for example, surface albedo, fractional vegetation cover, and land surface. You can print the quiz as a worksheet and use it for studying. The fao penmanmonteith method was developed by defining the reference crop as a. The estimate of pet is greatly influenced by the definition of the reference evapotranspiration, according to allen, pereira, rase, and smith 1998, which can be defined as the rate of.