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A Novel Approach for the Simulation of Reference Evapotranspiration and Its Partitioning

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  • Pei Wang

    (State Key Laboratory of Earth Surface Processes and Resource Ecology, Faculty of Geographical Science, Beijing Normal University, Beijing 100875, China)

  • Jingjing Ma

    (State Key Laboratory of Earth Surface Processes and Resource Ecology, Faculty of Geographical Science, Beijing Normal University, Beijing 100875, China)

  • Juanjuan Ma

    (State Key Laboratory of Earth Surface Processes and Resource Ecology, Faculty of Geographical Science, Beijing Normal University, Beijing 100875, China)

  • Haitao Sun

    (State Key Laboratory of Earth Surface Processes and Resource Ecology, Faculty of Geographical Science, Beijing Normal University, Beijing 100875, China)

  • Qi Chen

    (State Key Laboratory of Earth Surface Processes and Resource Ecology, Faculty of Geographical Science, Beijing Normal University, Beijing 100875, China)

Abstract

To estimate the irrigation volume required for agriculture and improve water resources utilization efficiency, it is essential to obtain an estimate of reference evapotranspiration (ET 0 ) and its components (e.g., reference transpiration, T 0 and reference soil evaporation, E 0 ). This study updated a soil-plant-atmosphere continuum (SPAC) evapotranspiration model and its associated components to obtain a reference-based SPAC model of reference evapotranspiration (R-SPAC), and it applied the model to an agricultural ecosystem. Model simulations of mean hourly ET 0 were benchmarked against those of the Penman-Monteith method by the Food and Agriculture Organization (FAO-PM) throughout the growing season. The resulting good correlation obtained (R 2 = 0.96, agreement index, I = 0.98, root-mean-square deviation (RMSD) = 0.05 mm h −1 ) validated the accuracy of the R-SPAC model. Sensitivity analysis was used to explore uncertainties and errors for ET 0 , T 0 , and E 0 caused by input variables. The results showed that net radiation and shortwave radiation at the study site were the main drivers of ET 0 for both the FAO-PM and R-SPAC models. The study showed that the proposed R-SPAC model can be used for predicting ET 0 and for exploring interactions between climate, crop type, and soil in determining evapotranspiration under various future environment conditions.

Suggested Citation

  • Pei Wang & Jingjing Ma & Juanjuan Ma & Haitao Sun & Qi Chen, 2021. "A Novel Approach for the Simulation of Reference Evapotranspiration and Its Partitioning," Agriculture, MDPI, vol. 11(5), pages 1-12, April.
    • Handle: RePEc:gam:jagris:v:11:y:2021:i:5:p:385-:d:542724
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    References listed on IDEAS

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