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Comparative study of daytime and nighttime sap flow of Populus euphratica

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Abstract

In order to quantify and characterize the variance in desert riparian forest tree sap flow, we measured the sap flow from Populus euphratica and compared the daytime and nighttime patterns and responses to environmental variables. Results showed that daytime sap flow velocity was significantly higher (P < 0.05). Daytime and nighttime mean sap flow velocities were 7.65 and 4.01 cm h−1 in spring, 21.38 and 9.60 cm h−1 in summer, and 11.04 and 5.21 cm h−1 in autumn, respectively. Moreover, results indicated that the stoma remained partially open (15% minimum) throughout the night, providing sufficient evidence for the existance of nighttime transpiration. The vapor pressure deficit (VPD), stomatal conductance (Cs), photosynthetically active radiation (PAR), air temperature (Ta), wind speed (WS), and soil moisture (θ) all had significant positive effects on P. euphratica sap flow velocity (P < 0.05). Furthermore, the relationship between daytime sap flow velocity and VPD showed clockwise hysteresis, while the relationship between nighttime sap flow velocity and VPD showed counter-clockwise hysteresis. It was evident that PAR and VPD were the key factors impacting daytime sap flow velocity, while Cs and θ were the key factors impacting nighttime sap flow velocity. Furthermore, linear regression results showed that daytime sap flow had a significant positive effect on nighttime sap flow throughout the growing season (P < 0.05).

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Acknowledgements

Funding for this study was provided by the Key Research Program of Frontier Sciences, CAS(QYZDJ-SSW-DQC031). The authors would also like to thank two anonymous reviewers for their constructive and valuable reviews and comments, which helped to improve this article.

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Authors and Affiliations

  1. Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, 730000, China

    Chun Yan Zhao, Jian Hua Si, Qi Feng, Teng Fei Yu & Pei Du Li

  2. University of Chinese Academy of Sciences, Beijing, 100049, China

    Chun Yan Zhao, Jian Hua Si, Qi Feng & Pei Du Li

  3. Key Laboratory of Ecohydrology of Inland River Basin, Chinese Academy of Sciences, Lanzhou, 730000, China

    Chun Yan Zhao, Jian Hua Si, Qi Feng, Teng Fei Yu & Pei Du Li

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  1. Chun Yan Zhao
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  2. Jian Hua Si
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  3. Qi Feng
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  4. Teng Fei Yu
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  5. Pei Du Li
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Correspondence to Qi Feng.

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Zhao, C.Y., Si, J.H., Feng, Q. et al. Comparative study of daytime and nighttime sap flow of Populus euphratica . Plant Growth Regul 82, 353–362 (2017). https://doi.org/10.1007/s10725-017-0263-6

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  • DOI: https://doi.org/10.1007/s10725-017-0263-6

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