Modeling crop evapotranspiration in a drip-irrigated sweet potato [Ipomoea batatas (L.) Lam.] field with plastic film mulching

文献类型： 外文期刊

第一作者： Zhang, Youliang

作者： Zhang, Youliang;Wang, Fengxin;Zhang, Youliang;Guo, Yu;Li, Duo;Feng, Shaoyuan;Qi, Zhiming;Yang, Kaijing;Li, Duo

作者机构：

关键词： Sweet potato; Bowen ratio energy balance system; Crop water use; Modified Shuttleworth-Wallace model; Drip irrigation

期刊名称：SOIL & TILLAGE RESEARCH （ 影响因子：6.8； 五年影响因子：7.8 ）

ISSN： 0167-1987

年卷期： 2025 年 254 卷

页码：

收录情况： SCI

摘要： As evapotranspiration (ET) is the main parameter determining crop water demand, accurate estimation of evapotranspiration rates is critical for optimizing water management strategies in agriculture. Using Bowen ratio energy balance (BREB) data measured in Shandong Province, China, during 2021-2022, along with corresponding meteorological and soil data, the adjusted Shuttleworth-Wallace (SW) model, along with adjusted single and dual crop coefficient models, were evaluated for their ability to accurately estimate crop ET (ETc) for a drip-irrigated sweet potato [Ipomoea batatas (L.) Lam.] field crop with plastic film mulching. The BREB method effectively measured ETcunder these crop production conditions and can thus be regarded as a reference benchmark to verify the reliability of other ETccalculation models. Under these production conditions, ETc was low during the initial growth stage, gradually increased and remained at a high level during the middle growth stage, then began to decrease gradually during the later growth stage. The average proportions of ETcduring the sweet potato crop's early, middle, and late growth stages were 7.28 %, 61.67 %, and 31.05 % of the total growing season evapotranspiration, respectively. Soil evaporation (E) and crop transpiration (T) accounted for 9 % and 91%, respectively, of ETcin this study. The adjusted SW model and the adjusted single and double crop coefficient models estimated ETc accurately, with the adjusted dual crop coefficient model providing more accurate ETc estimates than the single crop coefficient model. The SW model best reflected variations in ETc under the present study conditions. The R2, MAE, RMSE, and IA between the adjusted-SW-model-estimated ET (ETc-SW) and the ET measured using the BREB system (ETc-BREB) were 0.79, 0.29 mm d-1, 0.69 mm d-1, and 0.92, respectively in 2021, and 0.77, 0.26 mm d-1, 0.67 mm d-1, and 0.93 in 2022, respectively. The adjusted SW model can be applied to the estimation of soil E and crop T in drip-irrigated sweet potato field with plastic film mulching.

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