Comparison of six evapotranspiration models for a surface irrigated maize agro-ecosystem in Northern Italy
Articolo
Data di Pubblicazione:
2013
Citazione:
Comparison of six evapotranspiration models for a surface irrigated maize agro-ecosystem in Northern Italy / O. GHARSALLAH, A. FACCHI, C. GANDOLFI. - In: AGRICULTURAL WATER MANAGEMENT. - ISSN 0378-3774. - 2013(2013), pp. 119-130. [Epub ahead of print] [10.1016/j.agwat.2013.08.009]
Abstract:
The approaches for the estimation of evapotranspiration (ET) can be classified in “direct” methods, based
on the original Penman–Monteith (PM) equation, in which the canopy resistance rc is modelled, and “indirect”
methods, based on the preliminary calculation of ET for a well-watered reference grass (ETo) with
a constant rc, which is then multiplied by a crop coefficient Kc to obtain ET. Even if the latter approaches
are more widely adopted for their practical simplicity, many authors show that the former often provide
better ET estimates in absence of calibration of crop parameters. In this study the performances
of different direct and indirect methods were evaluated in the case of a surface irrigated maize grown
in the Padana Plain (Northern Italy). The “one-layer” original PM equation with three different models
for rc (Monteith, Jarvis, Katerji–Perrier), the “two-layers” PM model proposed by Shuttleworth and Wallace,
the “single” and “double crop coefficient” models illustrated in the Paper FAO-56 were compared to
latent heat fluxes measured in 2006 by eddy-covariance techniques. Results confirm that direct methods
are more performing. The FAO-56 models with generalized crop coefficients overestimate ET, especially
during the middle growth stage.
Tipologia IRIS:
01 - Articolo su periodico
Elenco autori:
O. Gharsallah, A. Facchi, C. Gandolfi
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