WANG, Yujie; BURLETT, Régis; FENG, Feng; TYREE, Melvin T.

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WANG, Yujie
University Yangling

BURLETT, Régis
Biodiversité, Gènes & Communautés [BioGeCo]

FENG, Feng
University Yangling

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Journal of Plant Hydraulics. 2014, vol. 1, p. 9 p.

INRA Science and Impact

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An improved way of calculating hydraulic conductance (K) in a Cochard Cavitron is described. Usually K is determined by measuring how fast water levels equilibrate between two reservoirs while a stem spins in a centrifuge. A regression of log meniscus position versus time was used to calculate K and this regression method was compared to the old technique that takes the average of discrete values. Results of a hybrid Populus 84K shows that the relative error of the new approach is significantly lower than the old technique by 4~5 times. The new computational method results in a relative error less than 0.5% or 0.3% from 8 or 12 points of measurement, respectively. The improved precision of K measurement also requires accurate assessment of stem temperature because temperature changes K by 2.4% oC-1. A computational algorithm for estimating stem temperature stability in a Cavitron rotor was derived. This algorithm provides information on how long it takes stem temperature to be known to within an error of ±0.1 oC.< Réduire

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Improved precision of hydraulic conductance measurements using a Cochard rotor in two different centrifuges

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