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Using sap flow measurements to estimate net assimilation in olive trees under different irrigation regimes

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Abstract

The measurement of bulk net assimilation (A) in fruit tree species is hindered by the need for sophisticated and complex instrumentation. The aim of this study is to present a simple alternative for estimating A from sap flow measurements and meteorological records. The proposed method was tested in a mature hedgerow olive orchard of 22.2 ha. Within the orchard, an irrigation experiment was established in a small plot including three treatments: a full irrigated control (CI), regulated deficit irrigation (DI) and a treatment mimicking customary orchard irrigation management (FI). Determinations of sap flow, water potential (Ψ) and trunk diameter variations (TDV) were conducted in the three treatments for 3 years. Also, measurements of net ecosystem exchange (NEE) were performed with an eddy covariance system in the centre of the orchard for the first season. The validity of the method was supported by the fact that estimates of A were consistent with both the measured values of NEE and published data regarding the same species under similar environmental and management conditions. Also, differences in A between irrigation treatments were generally in agreement with irrigation applied, transpiration (E p ), Ψ and TDV. It is concluded that the proposed sap flow-based method represents a user-friendly approach to estimate A at the canopy level with potential to study the effects of DI on biomass accumulation.

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Acknowledgments

This work was funded by the Andalusian Regional Government (Junta de Andalucía, Project P10-AGR-6456), the Spanish Ministry of Economy and Competitiveness (MINECO, project AGL-2010-20766) and European Regional Development Fund (ERDF). In addition, we thank the Spanish Research Council (CSIC) predoctoral JAE program and again the aforementioned project AGL-2010-20766 for providing the PhD scholarship granted to the first and second author, respectively. Besides that, the authors also acknowledge the excellent technical support provided by Mr Rafael del Río, Mr Ignacio Calatrava and Mr José Luis Vazquez.

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Authors and Affiliations

  1. Instituto de Agricultura Sostenible (IAS), Consejo Superior de Investigaciones Científicas (CSIC), Av. Menéndez Pidal s/n, 14080, Córdoba, Spain

    Álvaro López-Bernal, Omar García-Tejera, Luca Testi, Francisco Orgaz & Francisco J. Villalobos

  2. Instituto de Investigación y Formación Agraria y Pesquera (IFAPA-Alameda del Obispo), Av. Menéndez Pidal s/n, 14080, Córdoba, Spain

    Victorino A. Vega & Juan C. Hidalgo

  3. Dep. Agronomia, Universidad de Córdoba, Campus de Rabanales, Edificio C4, 14071, Córdoba, Spain

    Francisco J. Villalobos

Authors
  1. Álvaro López-Bernal
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  2. Omar García-Tejera
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  3. Victorino A. Vega
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  4. Juan C. Hidalgo
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  5. Luca Testi
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  6. Francisco Orgaz
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  7. Francisco J. Villalobos
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Corresponding author

Correspondence to Álvaro López-Bernal.

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Communicated by A. Ben-Gal.

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López-Bernal, Á., García-Tejera, O., Vega, V.A. et al. Using sap flow measurements to estimate net assimilation in olive trees under different irrigation regimes. Irrig Sci 33, 357–366 (2015). https://doi.org/10.1007/s00271-015-0471-7

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  • DOI: https://doi.org/10.1007/s00271-015-0471-7

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