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dc.contributorRyu, Dongryeolen_US
dc.contributorGeorge, Biju Alummoottilen_US
dc.contributorRyu, Youngryelen_US
dc.contributorDassanayake, Kithsirien_US
dc.creatorAkuraju, Venkata Radhaen_US
dc.identifier.citationVenkata Radha Akuraju, Dongryeol Ryu, Biju Alummoottil George, Youngryel Ryu, Kithsiri Dassanayake. (15/1/2017). Seasonal and inter-annual variability of soil moisture stress function in dryland wheat field, Australia. Agricultural and Forest Meteorology, 232, pp. 488-499.en_US
dc.description.abstractIt is assumed that the ratio of actual evapotranspiration (AET) to potential evapotranspiration (PET) is mostly controlled by the soil water content available for ET. This control is formulated using the soil moisture stress function (SSF), where the evaporative fraction (EF) or the fraction of the AET to PET (fPET) is assumed to be either a linear or a non-linear function of soil moisture. We examine the effectiveness of the soil moisture stress function to quantify soil moisture control on EF or fPET over a dryland wheat field in Victoria, Australia. Micrometeorological observations from two cropping seasons were used for the analysis. The efficacy of a root-density-weighted soil moisture estimate in predicting EF and fPET was investigated as against the commonly assumed fixed-depth root zone soil moisture. However, results indicate a strong relationship between EF and available soil water fraction (AWF) in the root zone only when solar radiation is higher than 5 MJ/m2 /day. As the rooting depth increases with vegetation growth, SSF exhibits the strongest correlation with AWF for increasing soil profile depth. In the early and harvest- ing crop growth stages, ET is constrained mostly by surface soil moisture (0–5 cm). In the mid-growth stages, ET is strongly influenced by soil moisture in the root zone (0–60 cm). The shape of SSF, however, changes significantly between the two years (2012 and 2013). It is inferred that different temporal rainfall patterns between the years caused wheat’s different response to water stress.en_US
dc.publisherElsevier Massonen_US
dc.sourceAgricultural and Forest Meteorology;232,(2016) Pagination 488,499en_US
dc.subjectroot zone soil moistureen_US
dc.subjectvegetation biomassen_US
dc.subjectnet radiationen_US
dc.titleSeasonal and inter-annual variability of soil moisture stress function in dryland wheat field, Australiaen_US
dc.typeJournal Articleen_US
cg.creator.idGeorge, Biju Alummoottil: 0000-0002-8427-3350en_US
cg.contributor.centerThe University of Melbourne, Department of Infrastructure Engineeringen_US
cg.contributor.centerInternational Center for Agricultural Research in the Dry Areas - ICARDAen_US
cg.contributor.centerSeoul National University - SNUen_US
cg.contributor.crpCGIAR Research Program on Water, Land and Ecosystems - WLEen_US
cg.contributor.funderInternational Center for Agricultural Research in the Dry Areas - ICARDAen_US
cg.contributor.projectCommunication and Documentation Information Services (CODIS)en_US
cg.contributor.project-lead-instituteInternational Center for Agricultural Research in the Dry Areas - ICARDAen_US
cg.coverage.regionAustralia and New Zealanden_US
dc.identifier.statusLimited accessen_US

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