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Assessing hydraulic redistribution with the compensated average gradient heat-pulse method on rain-fed olive trees

AuthorsFerreira, M. I.; Green, Steve; Conceição, Nuno S.; Fernández Luque, José Enrique
KeywordsReverse flow
Sap flow
Survival strategies
Water stress
Water uptake
Issue DateApr-2018
CitationPlant and Soil 425(1–2): 21–41 (2018)
AbstractAims: In this study on hydraulic redistribution (HR) in roots, we aimed to use the calibrated average-gradient (CAG) heat-pulse method, the novelty being the use of a much narrower averaging window for the signal analysis, in order to achieve a more linear calibration curve, allowing the HR quantification. Methods: The study was conducted in 12 large roots of a rain-fed olive orchard, for 6 months without significant rain, when the predawn leaf water potential decreased to −2.4 MPa, and immediately following the first autumn rains. Results: Detailed numerical modelling of the CAG method allowed verification of the response of the measurement system to a range of drivers, improving the linear range of the calibration response function, which has remained stable over the observations period. On average, reverse flow was observed during 30% of the summer nights and, in a conservative estimate, it increased to about 5% of total daily root flow before first autumn rain. Conclusions: Reverse flow accounted on average for 2.6% of the total daily root flow, enabling upper roots to stay active during the very dry late-summer period. In qualitative terms, our results confirm the CAG method as a reliable tool to identify reverse flow and quantify HR when it occurs
Description21 páginas.-- 13 figuras.-- 3 tablas.-- 78 referencias.--
Publisher version (URL)https://doi.org/10.1007/s11104-018-3585-x
Appears in Collections:(IRNAS) Artículos
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