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Partitioning Evapotranspiration in a Cotton Field under Mulched Drip Irrigation Based on the Water-Carbon Fluxes Coupling in an Arid Region in Northwestern China

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  • Yanxue Liu

    (College of Water Conservancy & Architectural Engineering, Shihezi University, Shihezi 832000, China
    Key Laboratory of Modern Water-Saving Irrigation of Xinjiang Production & Construction Group, Shihezi 832000, China)

  • Changlu Qiao

    (College of Water Conservancy & Architectural Engineering, Shihezi University, Shihezi 832000, China
    Key Laboratory of Modern Water-Saving Irrigation of Xinjiang Production & Construction Group, Shihezi 832000, China)

Abstract

Measuring evapotranspiration ( ET ) components in cotton fields under mulched drip irrigation is needed to improve water use efficiency and promote the development of water-saving agriculture. In this study, an Eddy Covariance ( EC ) system was used to observe the water-carbon fluxes of cotton fields under mulched drip irrigation in an arid region during two years (2021–2022). The Underlying Water Use Efficiency ( uWUE ) method was used to partition the ET into transpiration ( T ) and evaporation ( E ) in order to reveal the changing characteristics of ET and its components in cotton fields under mulched drip irrigation and analyze the effects of environmental factors on each component. The results showed that the diurnal variation of ET was the same as gross primary productivity ( GPP ), and their course of change showed a bimodal curve at budding, blooming, and boll stages. The relationship of T at different growth stages was the same as ET , which is blooming and boll stage > budding stage > boll opening stage > seedling stage. ET and its components were mainly affected by temperature ( T air ) and net radiation ( R n ). This study can provide a theoretical and practical basis for the application of uWUE in cotton fields under mulched drip irrigation and a scientific basis for the rational allocation of water resources and the formulation of a scientific water-saving irrigation system for farmland in an arid region.

Suggested Citation

  • Yanxue Liu & Changlu Qiao, 2023. "Partitioning Evapotranspiration in a Cotton Field under Mulched Drip Irrigation Based on the Water-Carbon Fluxes Coupling in an Arid Region in Northwestern China," Agriculture, MDPI, vol. 13(6), pages 1-16, June.
    • Handle: RePEc:gam:jagris:v:13:y:2023:i:6:p:1219-:d:1167373
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    References listed on IDEAS

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    1. Thomas F. Stocker & Christoph C. Raible, 2005. "Water cycle shifts gear," Nature, Nature, vol. 434(7035), pages 830-833, April.
    2. Yu, Keming & Moyeed, Rana A., 2001. "Bayesian quantile regression," Statistics & Probability Letters, Elsevier, vol. 54(4), pages 437-447, October.
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