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Diurnal and seasonal CO2 exchange and yield of maize cropland under different irrigation treatments in semiarid Inner Mongolia

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  • Peng, Manman
  • Han, Wenting
  • Li, Chaoqun
  • Li, Guang
  • Yao, Xiaomin
  • Zhang, Mengfei

Abstract

Different irrigation treatments in plants significantly influence CO2 emissions. This study investigated the net ecosystem CO2 exchange (NEE) and yield of maize cropland under different irrigation treatments to determine the optimal irrigation treatment at different maize growth stages. Different degrees of water deficit irrigation were carried out in four fields: full irrigation, 100% evapotranspiration (ET); moderate deficit irrigation, 65% ET; and severe deficit irrigation, 40% ET. Automated static and dynamic chambers were used to measure CO2 fluxes. We found that NEE showed a “V” -shaped trend during the day and slowly declined at night. The light response parameters were calculated using the rectangular hyperbola model, and the leaf area index accounted for 85% of the light use efficiency. In the late vegetative stage, severe deficit irrigation led to a reduction in CO2 emissions but significantly reduced the crop growth rate (p < 0.05). In the reproductive stage, full irrigation not only reduced CO2 emissions but also significantly increased the crop growth rate. In the maturation stage, moderate deficit irrigation reduced CO2 emissions, and the crop growth rate decreased compared with full irrigation, but the decrease was not significant (p > 0.05). Compared with full irrigation throughout the growth period, full irrigation in the reproductive stage and moderate deficit irrigation in the late vegetative and reproductive stages both increased the maize carbon sink capacity and light use efficiency at higher leaf area index, and the harvest index did not decrease significantly. However, inadequate irrigation in the reproductive stage or severe deficit irrigation in the late vegetative and maturation stages significantly reduced the maize harvest index. Thus, full irrigation during the reproductive stage, and moderate deficit irrigation during the late vegetative and reproductive stages were the optimal irrigation strategies for saving water, reducing CO2 emissions and ensuring a satisfactory maize yield.

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  • Peng, Manman & Han, Wenting & Li, Chaoqun & Li, Guang & Yao, Xiaomin & Zhang, Mengfei, 2021. "Diurnal and seasonal CO2 exchange and yield of maize cropland under different irrigation treatments in semiarid Inner Mongolia," Agricultural Water Management, Elsevier, vol. 255(C).
  • Handle: RePEc:eee:agiwat:v:255:y:2021:i:c:s0378377421003061
    DOI: 10.1016/j.agwat.2021.107041
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