y = 0.177 ln (x) + 5.01; filled triangles, y = 0.226 ln (x) + 2.86
with a determination coefficient of 0.60 (p < 0.05) and 0.89
(p < 0.01), respectively. On the other hand, there were no
significant relationships between the data of E at 1 h before the
measurement of root respiration and the intact root respiration in
Q. crispula