Canopy Chamber Measurements of Carbon Dioxide Fluxes in Corn and Soybean Fields

dc.contributor.author Helmers, Matthew
dc.contributor.author Wang, Zhuangji
dc.contributor.author Luo, Chenyi
dc.contributor.author Sauer, Thomas
dc.contributor.author Helmers, Matthew
dc.contributor.author Horton, Robert
dc.contributor.author Xu, Liukang
dc.contributor.author Horton, Robert
dc.contributor.department Agronomy
dc.contributor.department Agricultural and Biosystems Engineering
dc.date 2019-01-17T16:22:11.000
dc.date.accessioned 2020-06-29T23:06:08Z
dc.date.available 2020-06-29T23:06:08Z
dc.date.issued 2018-01-01
dc.description.abstract <p>Crop canopy CO<sub>2</sub> exchange rate (CER) includes crop photosynthesis and soil/plant respiration. A portable canopy chamber is effective in determining crop CER values at a relatively small spatial (m<sup>2</sup>) scale. The objectives of this study were to use a canopy chamber to measure CO<sub>2</sub> fluxes in corn (<em>Zea mays</em> L.) and soybean [<em>Glycine max</em> (L.) Merr.]. Chamber measurements were performed for 18 and 15 d in 2013 and 2014, respectively. The canopy chamber measures instantaneous CER fluxes, and daily and daytime cumulative CO<sub>2</sub> values were calculated from the instantaneous CER. The chamber CER results were compared with nearby eddy covariance (EC) flux tower measurements at a variety of time scales, i.e., instantaneous, daily, and daytime cumulative (multiple months). The daily and daytime cumulative chamber CER values were within 5% of the EC results, providing evidence for the effectiveness of the portable canopy chamber method. In conclusion, the portable canopy chamber provides reliable CO<sub>2</sub> flux measurements despite the small size of field plots.</p>
dc.description.comments <p>This article is published as Wang, Z., C. Luo, T. J. Sauer, M. J. Helmers, L. Xu, and R. Horton. 2018. Canopy Chamber Measurements of Carbon Dioxide Fluxes in Corn and Soybean Fields. Vadose Zone J. 17:180130. doi: <a href="http://dx.doi.org/10.2136/vzj2018.07.0130" target="_blank">10.2136/vzj2018.07.0130</a>.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/agron_pubs/555/
dc.identifier.articleid 1604
dc.identifier.contextkey 13583008
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath agron_pubs/555
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/4922
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/agron_pubs/555/2018_Horton_CanopyChamber.pdf|||Sat Jan 15 00:56:15 UTC 2022
dc.source.uri 10.2136/vzj2018.07.0130
dc.subject.disciplines Agriculture
dc.subject.disciplines Agronomy and Crop Sciences
dc.subject.disciplines Bioresource and Agricultural Engineering
dc.title Canopy Chamber Measurements of Carbon Dioxide Fluxes in Corn and Soybean Fields
dc.type article
dc.type.genre article
dspace.entity.type Publication
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