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<p>In plastic-mulched drip irrigation, system performance tends to degrade with excessively frequent irrigation scheduling, which is commonly governed by crop evapotranspiration and thermal-hydraulic processes. This study investigated water and heat transport in plastic-mulched drip irrigation systems for sweet potato (Ipomoea batatas L.) field in Shandong Province, China, during 2021 and 2022. The Bowen ratio energy balance (BREB) system was employed to monitor the dynamic processes of water and heat fluxes in the sweet potato field. The latent heat flux (λET), sensible heat flux (H), and soil heat flux (G) accounted for 69.12%, 25.14%, and 6.57% of total energy expenditure in 2021 and the proportions shifted to 60.89%, 27.39%, and 11.90% in 2022, respectively. The results indicated that the λET constituted the primary component of energy expenditure over the full growth season. A path analysis revealed that the impact of each environmental factor on the 10-minute λET in plastic-mulched drip irrigation systems was not only direct or indirect but also a combined result of interactions among factors. Specially, net radiation (R<sub>n</sub>) was the most critical environmental factor affecting the 10-minute λET, followed by air temperature (T<sub>a</sub>) and vapor pressure deficit (VPD). Furthermore, R<sub>n</sub> and VPD dominated through direct effects, and other environmental factors primarily drive indirect effects, while G exhibiting the strongest indirect effect. This study contributes to the measurement of crop evapotranspiration and scheduling of irrigation in a plastic-mulched drip irrigation system for sweet potato in semi-humid regions.</p>

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Variations in water and heat fluxes in plastic-mulched drip irrigation systems for sweet potato within semi-humid regions

  • 期刊论文

  • 发表日期：

    2026年3月23日

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  • Youliang Zhang,
  • Zijian Wang,
  • Duo Li,
  • Zhiming Qi,
  • Shaoyuan Feng,
  • Fengxin Wang

摘要

In plastic-mulched drip irrigation, system performance tends to degrade with excessively frequent irrigation scheduling, which is commonly governed by crop evapotranspiration and thermal-hydraulic processes. This study investigated water and heat transport in plastic-mulched drip irrigation systems for sweet potato (Ipomoea batatas L.) field in Shandong Province, China, during 2021 and 2022. The Bowen ratio energy balance (BREB) system was employed to monitor the dynamic processes of water and heat fluxes in the sweet potato field. The latent heat flux (λET), sensible heat flux (H), and soil heat flux (G) accounted for 69.12%, 25.14%, and 6.57% of total energy expenditure in 2021 and the proportions shifted to 60.89%, 27.39%, and 11.90% in 2022, respectively. The results indicated that the λET constituted the primary component of energy expenditure over the full growth season. A path analysis revealed that the impact of each environmental factor on the 10-minute λET in plastic-mulched drip irrigation systems was not only direct or indirect but also a combined result of interactions among factors. Specially, net radiation (Rn) was the most critical environmental factor affecting the 10-minute λET, followed by air temperature (Ta) and vapor pressure deficit (VPD). Furthermore, Rn and VPD dominated through direct effects, and other environmental factors primarily drive indirect effects, while G exhibiting the strongest indirect effect. This study contributes to the measurement of crop evapotranspiration and scheduling of irrigation in a plastic-mulched drip irrigation system for sweet potato in semi-humid regions.