TY - JOUR
AU - Wang, Yujie
AU - Burlett, Régis
AU - Feng, Feng
AU - Tyree, Melvin T.
PY - 2014/10/20
Y2 - 2022/08/17
TI - Improved precision of hydraulic conductance measurements using a Cochard rotor in two different centrifuges
JF - Journal of Plant Hydraulics
JA - JPH
VL - 1
IS - 0
SE - Articles
DO - 10.20870/jph.2014.e007
UR - https://jplanthydro.org/article/view/33
SP - e007
AB - <p style="text-align: justify;"><strong>An improved way ofcalculating hydraulic conductance (<em>K</em>) in a Cochard cavitron is described. Usually<em>K</em> 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 <em>K</em> 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 <em>K</em> measurement also requires accurate assessment of stem temperature because temperature changes <em>K</em> by 2.4% <sup>o</sup>C<sup>-1</sup>. 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<sup>o</sup>C.</strong></p>
ER -