Results
We simultaneously measured the intact root respiration
and leaf gas exchange at the top of the canopy of Q.
crispula and C. obtusa in the field and examined the
relationships between the intact root respiration rate and
the parameters of the leaf gas exchange. Figure 2 shows
the diurnal changes in the photosynthesis rate (Pn),
transpiration rate (E), and intact root respiration rate
(Rr) on August 30, 2005. Pn in both species increased
from morning toward noon and decreased in the evening,
although some leaves showed midday depression in
Pn with decreasing E. All root samples of C. obtusa