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Titolo:
Growing season evapotranspiration from duplex soils in south-western Australia
Autore:
Ward, PR; Dunin, FX;
Indirizzi:
CSIRO, Div Plant Ind, Wembly, WA 6913, Australia CSIRO Wembly WA Australia 6913 Div Plant Ind, Wembly, WA 6913, Australia
Titolo Testata:
AGRICULTURAL WATER MANAGEMENT
fascicolo: 2, volume: 50, anno: 2001,
pagine: 141 - 159
SICI:
0378-3774(20010903)50:2<141:GSEFDS>2.0.ZU;2-Q
Fonte:
ISI
Lingua:
ENG
Soggetto:
MEDITERRANEAN-TYPE ENVIRONMENT; WATER-USE EFFICIENCY; WHEAT; GROWTH; ROOT; PASTURES; DRAINAGE; CLIMATE; BARLEY; CEREAL;
Keywords:
time-domain reflectometry; energy balance; water balance; pasture; water use;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
30
Recensione:
Indirizzi per estratti:
Indirizzo: Ward, PR CSIRO, Div Plant Ind, Private Bag 5, Wembly, WA 6913, Australia CSIRO Private Bag 5 Wembly WA Australia 6913 , WA 6913, Australia
Citazione:
P.R. Ward e F.X. Dunin, "Growing season evapotranspiration from duplex soils in south-western Australia", AGR WATER M, 50(2), 2001, pp. 141-159

Abstract

In the Mediterranean-type climate of south-western Australia, evapotranspiration (ET) is of particular importance because of the expanding threat of dryland salinity. This paper reports on studies at two sites for a total of5 years aimed at quantifying ET from pastures on duplex (sand over clay) soils within the region. ET was assessed with the Bowen ratio energy balancetechnique, and compared with potential ET and ET calculated from the waterbalance. ET closely matched potential ET from the break of the season (Mayor June) until some seasonally dependent time in spring (September or October). The date of divergence of actual from potential ET was not clearly defined, but occurred gradually during a 2-week period, and was associated with the rapid depletion of soil water at the end of the season. The gradual transition was due to natural variation in the magnitude of daily potentialET during the transition period, which ranged from 1.1 to 4.5 mm. The water balance tended to overestimate ET during winter, by assuming deep drainage was zero, whereas the energy balance tended to overestimate ET very late in the season. For duplex soils in south-western Australia, a composite approach may give a cheap and accurate estimate of growing season ET, providedthat rainfall is adequate to maintain surface soil moisture. This approachassumes that ET equals potential ET until the rapid decline in soil water begins, and ET equals changes in soil water storage after this time. (C) 2001 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 23/11/20 alle ore 21:44:01