Please use this identifier to cite or link to this item: https://hdl.handle.net/1959.11/556
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dc.contributor.authorMcLeod, MKen
dc.contributor.authorDaniel, Hen
dc.contributor.authorFaulkner, RDen
dc.contributor.authorMurison, RDen
dc.date.accessioned2008-07-18T13:54:00Z-
dc.date.issued2004-
dc.identifier.citationAgricultural Water Management, 67(1), p. 15-34en
dc.identifier.issn1873-2283en
dc.identifier.issn0378-3774en
dc.identifier.urihttps://hdl.handle.net/1959.11/556-
dc.description.abstractAn enclosed portable chamber was constructed and calibrated to measure actual evapotranspiration (ET) from crop and pasture and then evaluated against established methods that are used to determine evapotranspiration. The chamber was equipped with variable speed electric fans to mix the air within the chamber during each ET measurement. The most appropriate fan speed was investigated.Pasture ET measured using the enclosed portable chamber compared well with predicted water loss using the water balance method for a 6-day period during winter 1997 in Armidale (NSW, Australia). Mean cumulative pasture ET for the 6-day period was 5.8 and 5.9 mm measured with the enclosed portable chamber and water balance method, respectively.Wheat crop ET measured using the enclosed portable chamber was compared with that estimated by the Bowen ratio (BR) method for a 2-day period in the early growth stages of the crop. Mean ET using the enclosed portable chamber was 2.4 mm per day compared with 2.3 mm per day using the BR method.Results from the enclosed portable chamber method showed sensitivity to the choice of fan speed. A slow fan speed that produced an air velocity of 2.7 km/h, gave the closest agreement with the Bowen ratio method (2.3 mm per day versus 2.2 mm per day) for the wheat crop.The main attractions of the enclosed portable chamber method include: (1) its suitability for ET measurement within small areas (<1 m2), which enables ET measurement from individual plant communities within small areas; (2) its main principles of measuring the actual water flux from transpiring vegetation rather than inferring it from climatic parameters; (3) the speed by which an instantaneous ET rate is obtained (less than 1 min); (4) instantaneous ET measurement can be repeated throughout the day from the same plant communities; and (5) the portability of the enclosed portable chamber. ET measurement using the enclosed portable chamber method may be combined with the existing soil water balance models for comparing alternative crop and pasture systems in terms of their water balance.en
dc.languageenen
dc.publisherElsevier BVen
dc.relation.ispartofAgricultural Water Managementen
dc.titleEvaluation of an enclosed portable chamber to measure crop and pasture actual evapotranspiration at small scaleen
dc.typeJournal Articleen
dc.identifier.doi10.1016/j.agwat.2003.12.006en
dcterms.accessRightsUNE Greenen
dc.subject.keywordsAgricultural Hydrology (Drainage, Flooding, Irrigation, Quality, etc)en
local.contributor.firstnameMKen
local.contributor.firstnameHen
local.contributor.firstnameRDen
local.contributor.firstnameRDen
local.subject.for2008079901 Agricultural Hydrology (Drainage, Flooding, Irrigation, Quality, etc)en
local.subject.seo630202 Sown grassesen
local.profile.schoolAdministrationen
local.profile.schoolSchool of Environmental and Rural Scienceen
local.profile.schoolSchool of Science and Technologyen
local.profile.emailhdaniel@une.edu.auen
local.profile.emailrfaulkne@une.edu.auen
local.profile.emailrmurison@une.edu.auen
local.output.categoryC1en
local.record.placeauen
local.record.institutionUniversity of New Englanden
local.identifier.epublicationsrecordpes:1774en
local.publisher.placeNetherlandsen
local.format.startpage15en
local.format.endpage34en
local.identifier.scopusid2442614978en
local.peerreviewedYesen
local.identifier.volume67en
local.identifier.issue1en
local.access.fulltextYesen
local.contributor.lastnameMcLeoden
local.contributor.lastnameDanielen
local.contributor.lastnameFaulkneren
local.contributor.lastnameMurisonen
dc.identifier.staffune-id:mmcleoden
dc.identifier.staffune-id:hdanielen
dc.identifier.staffune-id:rfaulkneen
dc.identifier.staffune-id:rmurisonen
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.identifier.unepublicationidune:562en
dc.identifier.academiclevelAcademicen
dc.identifier.academiclevelAcademicen
local.title.maintitleEvaluation of an enclosed portable chamber to measure crop and pasture actual evapotranspiration at small scaleen
local.output.categorydescriptionC1 Refereed Article in a Scholarly Journalen
local.search.authorMcLeod, MKen
local.search.authorDaniel, Hen
local.search.authorFaulkner, RDen
local.search.authorMurison, RDen
local.open.fileurlhttps://rune.une.edu.au/web/retrieve/80998490-a4c1-4ed6-b6de-2ea236194c7cen
local.uneassociationUnknownen
local.identifier.wosid000221558100002en
local.year.published2004en
local.fileurl.openhttps://rune.une.edu.au/web/retrieve/80998490-a4c1-4ed6-b6de-2ea236194c7cen
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