Portable canopy chamber measurements of evapotranspiration in corn, soybean, and reconstructed prairie

dc.contributor.author Helmers, Matthew
dc.contributor.author Wang, Zhuangji
dc.contributor.author Sauer, Thomas
dc.contributor.author Helmers, Matthew
dc.contributor.author Horton, Robert
dc.contributor.department Agronomy
dc.contributor.department Agricultural and Biosystems Engineering
dc.date 2018-03-13T23:15:48.000
dc.date.accessioned 2020-06-29T22:43:23Z
dc.date.available 2020-06-29T22:43:23Z
dc.date.issued 2018-02-02
dc.description.abstract <p>Evapotranspiration (ET) is a vital component of a field water balance. Canopy chambers are a promising method for determining crop ET because they are portable and applicable at a relatively small plot (m2) scale. Although a variety of canopy chamber designs have been proposed, field tests are still necessary to evaluate chamber performance for measuring crop ET. The objectives of this study are (1) to construct and use an improved canopy chamber to measure ET of three crops [corn (Zea mays, L.), soybean (Glycine max), and reconstructed mixed prairie] and (2) to compare the canopy chamber measurements with flux tower results and field water balance measurements (i.e., rainfall, soil water storage, ET and drainage). Three cropping systems including corn/soybean in a corn-soybean rotation, and reconstructed mixed prairie were studied in central Iowa. Canopy chamber daytime measurements were performed on 18 days in 2013 (a relatively dry growing season) and on 15 days in 2014 (a relatively wet growing season). Based on the results, the differences in daily ET and seasonal cumulative ET between canopy chambers and an eddy covariance flux tower over the measurement periods were within 5%, providing evidence that the portable canopy chamber can accurately measured ET. The chamber ET values and field water balance ET values had similar patterns over the 2013 and 2014 measurement periods, and the differences of cumulative results were less than 10%. In conclusion, the canopy chamber was proven to be an effective method for measuring small plot ET.</p>
dc.description.comments <p>This article is published as Luo, Chenyi, Zhuangji Wang, Thomas J. Sauer, Matthew J. Helmers, and Robert Horton. "Portable canopy chamber measurements of evapotranspiration in corn, soybean, and reconstructed prairie." <em>Agricultural Water Management</em> 198 (2018): 1-9. DOI:<em> </em><a href="http://dx.doi.org/10.1016/j.agwat.2017.11.024" target="_blank">10.1016/j.agwat.2017.11.024</a>. Posted with permission.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/abe_eng_pubs/881/
dc.identifier.articleid 2165
dc.identifier.contextkey 11767188
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath abe_eng_pubs/881
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/1692
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/abe_eng_pubs/881/2018_Helmers_PortableCanopy.pdf|||Sat Jan 15 02:17:31 UTC 2022
dc.source.uri 10.1016/j.agwat.2017.11.024
dc.subject.disciplines Agriculture
dc.subject.disciplines Agronomy and Crop Sciences
dc.subject.disciplines Bioresource and Agricultural Engineering
dc.subject.disciplines Sustainability
dc.subject.disciplines Water Resource Management
dc.subject.keywords Portable canopy chamber
dc.subject.keywords Evapotranspiration
dc.subject.keywords Field water balance
dc.title Portable canopy chamber measurements of evapotranspiration in corn, soybean, and reconstructed prairie
dc.type article
dc.type.genre article
dspace.entity.type Publication
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