related to the water storage capacity in the trunk and
branches, which, in turn, depends on the tree size
(Schulze et al. 1985; Meinzer et al. 2004).
The present study shows that the root respiration
rates of canopy trees in the field, C. obtusa and Q.
crispula, change dynamically on a diurnal time scale,
which is caused by changes in the transpiration rate in
leaves. We also observed midday depression in root
respiration in saplings of Betula platyphylla var. japonica
and Ilex crenata (unpublished data). Further studies will
be necessary to clarify whether these diurnal variations
in root respiration associated with changes in the leaf
transpiration rate are present in other species and the
effects of those variations on the carbon and water cycling
of forest ecosystems.
related to the water storage capacity in the trunk and
branches, which, in turn, depends on the tree size
(Schulze et al. 1985; Meinzer et al. 2004).
The present study shows that the root respiration
rates of canopy trees in the field, C. obtusa and Q.
crispula, change dynamically on a diurnal time scale,
which is caused by changes in the transpiration rate in
leaves. We also observed midday depression in root
respiration in saplings of Betula platyphylla var. japonica
and Ilex crenata (unpublished data). Further studies will
be necessary to clarify whether these diurnal variations
in root respiration associated with changes in the leaf
transpiration rate are present in other species and the
effects of those variations on the carbon and water cycling
of forest ecosystems.
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