Estimating the Contribution of Groundwater to the Root Zone of Winter Wheat Using Root Density Distribution Functions

dc.contributor.author Zhu, Yonghua
dc.contributor.author Ren, Liliang
dc.contributor.author Horton, Robert
dc.contributor.author Horton, Robert
dc.contributor.author Lü, Haishen
dc.contributor.author Wang, Zhenlong
dc.contributor.author Yuan, Fei
dc.contributor.department Agronomy
dc.date 2018-02-01T22:12:46.000
dc.date.accessioned 2020-06-29T23:05:11Z
dc.date.available 2020-06-29T23:05:11Z
dc.date.copyright Mon Jan 01 00:00:00 UTC 2018
dc.date.issued 2018-01-01
dc.description.abstract <p>For winter wheat (Triticum aestivum L.) that grows during the rainless season, the contribution of groundwater to the root zone (CGWR) is an important water source for growth. Accurately estimating the CGWR is important for making decisions on irrigation and discharge for winter wheat fields and preventing water pollution. Because winter wheat slows and even stops root growth over winter, so the fixed root density distribution function that is suitable for soybean [Glycine max (L.) Merr.] may not suit winter wheat calculations. Therefore, when estimating the CGWR of winter wheat with the numerical model HYDRUS-1D, the root density distribution function should first be determined from two types: fixed or piecewise root density distribution functions. Based on field observations and local weather data for 2004–2005 and 2005–2006, HYDRUS-1D was evaluated with different root density distribution functions by comparing simulated and measured root zone soil water contents. The evaluated model with the most suitable distribution function was used to estimate the daily CGWR for six winter wheat hydrological growth seasons. For all seasons, winter wheat growth was assumed to be at its optimal state. The main results were: (i) a piecewise root density distribution function was the most suitable for winter wheat; (ii) simulated seasonal CGWRs were 154, 128, and 136 mm in the dry, normal, and wet seasons, respectively; and (iii) the CGWR for winter wheat transpiration was about 58, 47, and 69% of the total in dry, normal, and wet seasons, respectively. Overall, we concluded that accurate description of the root density distribution was helpful to estimate the CGWR.</p>
dc.description.comments <p>This article is published as Zhu, Y., L. Ren, R. Horton, H. Lü, Z. Wang, and F. Yuan. 2017. Estimating the contribution of groundwater to the root zone of winter wheat using root density distribution functions. Vadose Zone J. doi:<a href="http://dx.doi.org/10.2136/vzj2017.04.0075" target="_blank">10.2136/vzj2017.04.0075</a>.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/agron_pubs/432/
dc.identifier.articleid 1482
dc.identifier.contextkey 11465990
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath agron_pubs/432
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/4790
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/agron_pubs/432/2018_Horton_EstimatingContribution.pdf|||Sat Jan 15 00:15:45 UTC 2022
dc.source.uri 10.2136/vzj2017.04.0075
dc.subject.disciplines Agronomy and Crop Sciences
dc.subject.disciplines Hydrology
dc.subject.disciplines Soil Science
dc.title Estimating the Contribution of Groundwater to the Root Zone of Winter Wheat Using Root Density Distribution Functions
dc.type article
dc.type.genre article
dspace.entity.type Publication
relation.isAuthorOfPublication d3fb0917-6868-417e-9695-a010896cfafa
relation.isOrgUnitOfPublication fdd5c06c-bdbe-469c-a38e-51e664fece7a
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