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Partitioning evapotranspiration of Camellia oleifera during the growing season based on the Penman-Monteith model combined with the micro-lysimeter and stable isotope methods

Author

Listed:
  • Xia, Xiong
  • Hu, Deyong
  • Liu, Xin
  • Yue, Lingli
  • Ma, Bin
  • Chen, Yongzhong
  • Wu, Youjie

Abstract

Frequent seasonal droughts impact on crop growth and yield in the hilly areas of southern China. A good knowledge of its evapotranspiration partitioning of the main economic oil crop Camellia Oleifera is particularly important to increase water productivity and improve water resource management. The isotope-based method was applied to partition ET in the hilly Camellia Oleifera Forest of southern China. The isotopic composition of evapotranspiration vapor (δET), transpiration vapor (δT) and evaporation vapor (δE) were calculated by the Keeling plot method, the Craig-Gordon model (C-G model), and isotopic steady-state assumptions, respectively. The conventional Penman-Monteith model and the micro-lysimeter method (PM-L) were used to compare and assess the ET partitioning results (Ft). It showed that the Ft values calculated by the two methods were in good agreement. The isotopic composition of soil water at the evaporating front (δS) ahead and after DOY151 was sampled at 5 and 10 cm depth, respectively, where the correlation coefficients (R2) of the Ft values calculated by δ18O and δ2H were 0.84 and 0.66. Ft Calculated by δ18O was more accurate than δ2H because of the higher correlation coefficient of δ18O in the keeling plot regression and in the linear fit with PM-L. The isotopic composition of soil evaporation vapor（δE）calculated by dynamic εk (kinetic fractionation effects) values can be more accurate to quantify the ET partitioning results (with the R2 of 0.90). The mean values of Ft were 0.79 and 0.82 by the PM-L method and the isotope-based method respectively over the whole growing season, indicating the isotope method is robust in calculating ET partitioning for Camellia oleifera in the region. We also found that the seasonal variation of Ft is mainly controlled by temperature (T), soil water content (SWC), and leaf area index (LAI), all of which can be effectively expressed as power functions. The results provide potential assistance for water management in Camellia oleifera woodlands.

Suggested Citation

  • Xia, Xiong & Hu, Deyong & Liu, Xin & Yue, Lingli & Ma, Bin & Chen, Yongzhong & Wu, Youjie, 2024. "Partitioning evapotranspiration of Camellia oleifera during the growing season based on the Penman-Monteith model combined with the micro-lysimeter and stable isotope methods," Agricultural Water Management, Elsevier, vol. 297(C).
    • Handle: RePEc:eee:agiwat:v:297:y:2024:i:c:s0378377424001665
    DOI: 10.1016/j.agwat.2024.108831
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    References listed on IDEAS

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    1. Widmoser, Peter, 2009. "A discussion on and alternative to the Penman-Monteith equation," Agricultural Water Management, Elsevier, vol. 96(4), pages 711-721, April.
    2. Lu, Xuefei & Liang, Liyin L. & Wang, Lixin & Jenerette, G. Darrel & McCabe, Matthew F. & Grantz, David A., 2017. "Partitioning of evapotranspiration using a stable isotope technique in an arid and high temperature agricultural production system," Agricultural Water Management, Elsevier, vol. 179(C), pages 103-109.
    3. Flumignan, Danilton Luiz & de Faria, Rogério Teixeira & Prete, Cássio Egídio Cavenaghi, 2011. "Evapotranspiration components and dual crop coefficients of coffee trees during crop production," Agricultural Water Management, Elsevier, vol. 98(5), pages 791-800, March.
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