Net ecosystem exchange of CO2 and H2 O fluxes from irrigated grain sorghum and maize in the Texas High Plains

The Science of the Total Environment
Pradeep WagleDavid K Brauer

Abstract

Net ecosystem exchange (NEE) of carbon dioxide (CO2) and water vapor (H2O) fluxes from irrigated grain sorghum (Sorghum bicolor L. Moench) and maize (Zea mays L.) fields in the Texas High Plains were quantified using the eddy covariance (EC) technique during 2014-2016 growing seasons and examined in terms of relevant controlling climatic variables. Eddy covariance measured evapotranspiration (ETEC) was also compared against lysimeter measured ET (ETLys). Daily peak (7-day averages) NEE reached approximately -12 g C m-2 for sorghum and -14.78 g C m-2 for maize. Daily peak (7-day averages) ETEC reached approximately 6.5 mm for sorghum and 7.3 mm for maize. Higher leaf area index (5.7 vs 4-4.5 m2 m-2) and grain yield (14 vs 8-9 t ha-1) of maize compared to sorghum caused larger magnitudes of NEE and ETEC in maize. Comparisons of ETEC and ETLys showed a strong agreement (R2 = 0.93-0.96), while the EC system underestimated ET by 15-24% as compared to lysimeter without any corrections or energy balance adjustments. Both NEE and ETEC were not inhibited by climatic variables during peak photosynthetic period even though diurnal peak values (~2-weeks average) of photosynthetic photon flux density (PPFD), air temperature (Ta), and vapor ...Continue Reading

References

Jan 22, 2008·Journal of Industrial Microbiology & Biotechnology·Gautam SarathKenneth P Vogel
Sep 5, 2008·Ecological Applications : a Publication of the Ecological Society of America·Thomas Foken
Dec 8, 2016·The Science of the Total Environment·Gabriel Y K MoinetDavid Whitehead
Mar 28, 2017·The Science of the Total Environment·Pradeep WagleBrian K Northup

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Citations

Jun 20, 2020·The Science of the Total Environment·Pradeep WagleSébastien C Biraud
Feb 23, 2021·The Science of the Total Environment·Xia CuiForbes Walker
Aug 23, 2021·Environmental Science and Pollution Research International·Yayi NiuYulong Duan

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