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Partitioning evapotranspiration by measuring soil water evaporation with heat-pulse sensors and plant transpiration with sap flow gauges

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  • Wang, Yueyue
  • Horton, Robert
  • Xue, Xuzhang
  • Ren, Tusheng

Abstract

Understanding the contributions of soil water evaporation (E) and crop transpiration (T) to evapotranspiration (ET) is essential for irrigation management and improving crop water use efficiency. Current methods for partitioning ET are subject to uncertainties, due in part to the scale differences in determining E, T, and ET. In this study, ET of a lysimeter planted with maize (Zea mays L.) was partitioned into E and T using sensors that had compatible measurement scales: E was measured with heat pulse sensors (following the sensible heat balance (SHB) and modified sensible heat balance (MSHB) approaches), and T was measured with sap flow gauges (following the heat-balance sap-flow (HBSF) method). The accuracy of the measurements was evaluated by comparing the sum of E and T values (E + T) to weighing lysimeter ET data. During the study period, E, T, and ET had average values of 0.9, 4.0, and 4.8 mm d−1, respectively, and the fractions of E and T were 19% and 81% of E + T, respectively. In general, the E + T values agreed well with the lysimeter ET data, but slight overestimations and underestimations were observed at relatively small and relatively large ET rates, respectively. By combining the SHB and MSHB approaches and the HBSF method, it is possible to partition ET into E and T with satisfactory accuracy.

Suggested Citation

  • Wang, Yueyue & Horton, Robert & Xue, Xuzhang & Ren, Tusheng, 2021. "Partitioning evapotranspiration by measuring soil water evaporation with heat-pulse sensors and plant transpiration with sap flow gauges," Agricultural Water Management, Elsevier, vol. 252(C).
    • Handle: RePEc:eee:agiwat:v:252:y:2021:i:c:s0378377421001487
    DOI: 10.1016/j.agwat.2021.106883
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    References listed on IDEAS

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    1. Ding, Risheng & Kang, Shaozhong & Zhang, Yanqun & Hao, Xinmei & Tong, Ling & Du, Taisheng, 2013. "Partitioning evapotranspiration into soil evaporation and transpiration using a modified dual crop coefficient model in irrigated maize field with ground-mulching," Agricultural Water Management, Elsevier, vol. 127(C), pages 85-96.
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    2. Lai, Jianbin & Liu, Tiegang & Luo, Yi, 2022. "Evapotranspiration partitioning for winter wheat with shallow groundwater in the lower reach of the Yellow River Basin," Agricultural Water Management, Elsevier, vol. 266(C).
    3. Han, Weihua & Sun, Jiaxing & Zhang, Kui & Mao, Lili & Gao, Lili & Hou, Xuemin & Cui, Ningbo & Kang, Wenhuai & Gong, Daozhi, 2023. "Optimizing drip fertigation management based on yield, quality, water and fertilizer use efficiency of wine grape in North China," Agricultural Water Management, Elsevier, vol. 280(C).
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    5. Di Wang, & Wang, Li, 2023. "Characteristics of soil evaporation at two stages of growth in apple orchards with different ages in a semi-humid region," Agricultural Water Management, Elsevier, vol. 280(C).

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