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Proceedings Paper

Comparing actual evapotranspiration and plant water potential on a vineyard
Author(s): Antonino Maltese; Carmelo Cammalleri; Fulvio Capodici; Giuseppe Ciraolo; Francesco Colletti; Goffredo La Loggia; Tanino Santangelo
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Paper Abstract

Agricultural water requirement in arid and semi-arid environments represents an important fraction of the total water consumption, suggesting the need of appropriate water management practices to sparingly use the resource. Furthermore the quality and quantity of some crops products, such as grape, is improved under a controlled amount of water stress. The latter is related, on a side to actual evapotranspiration (ET) through water demand, on the other side to plant water content through leaf water potential. Residual energy balance approaches based on remote sensing allow to estimate the spatial distribution of daily actual ET at plant scale, representing an useful tool to detect its spatial variability across different cultivars and even within each parcel. Moreover, the connection between actual ET and leaf water potential is still not well assessed, especially under water stress conditions, even if farmers use leaf water potential to plan irrigation. However residual energy balance methods are based on the hypothesis that storage terms are negligible, at least during the remote sensor overpass. Indeed, energy balance approaches estimate daily actual ET from the instantaneous value at the overpass time using a daily integration method. The paper first verifies this latter assumption using field data acquired by a flux tower on a whole phenological period. Then, the actual ET values measured by eddy covariance tower were analyzed together with water potential measured using a Scholander chamber; the analysis highlights that, under water stress conditions, daily actual ET is inversely linearly related with water potential. These results suggest the possibility to use remote sensing-based ET as support for irrigation management at plot scale.

Paper Details

Date Published: 6 October 2011
PDF: 9 pages
Proc. SPIE 8174, Remote Sensing for Agriculture, Ecosystems, and Hydrology XIII, 81740O (6 October 2011); doi: 10.1117/12.899070
Show Author Affiliations
Antonino Maltese, Univ. degli Studi di Palermo (Italy)
Carmelo Cammalleri, Univ. degli Studi di Palermo (Italy)
Fulvio Capodici, Univ. degli Studi di Palermo (Italy)
Giuseppe Ciraolo, Univ. degli Studi di Palermo (Italy)
Francesco Colletti, Univ. degli Studi di Palermo (Italy)
Goffredo La Loggia, Univ. degli Studi di Palermo (Italy)
Tanino Santangelo, Univ. degli Studi di Palermo (Italy)

Published in SPIE Proceedings Vol. 8174:
Remote Sensing for Agriculture, Ecosystems, and Hydrology XIII
Christopher M. U. Neale; Antonino Maltese, Editor(s)

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