NDLI: Midday depression of tree root respiration in relation to leaf transpiration

Content Provider	Springer Nature Link
Author	Bekku, Yukiko Sakata Sakata, Tsuyoshi Tanaka, Tadashi Naka, Takashi
Copyright Year	2011
Abstract	The root respiration rate often shows an exponential or a linear relationship with temperature under laboratory conditions. However, under intact conditions in the field, the root respiration rates of some tree species decreased around midday despite an increment of the root temperature (Bekku et al. 2009). To clarify the cause of midday depression, we examined the relationships between the intact root respiration and parameters of leaf gas exchange through the simultaneous field measurement of the gas exchange in the leaf and root of Quercus crispula and Chamaecyparis obtusa, which are canopy trees. There were no significant relationships between the root respiration rates (R $_{r}$) and the parameters of leaf gas exchange in the field. However, in C. obtusa, the relationships between R $_{r}$ and the transpiration rates (E) at 1 h before the measurement of R $_{r}$ were fitted by logarithmic function with a determination coefficient of 0.60–0.89. In the light-manipulation experiments using saplings, R $_{r}$ had significant positive correlations with E at 20 min before the measurement of R $_{r}$, root temperature (T $_{r}$), and the photosynthesis (P $_{n}$) at 20 min before the measurement of R $_{r}$. We examined which factor, P $_{n}$ or E, affects the root respiration rate through a manipulation experiment using a growth chamber regulating the ambient CO$_{2}$ concentration and relative humidity independently under constant air temperature and photosynthetic photon flux density. As a result, the root respiration rates changed corresponding to E and not P $_{n}$. These results suggest that the root respiration rate of trees changes significantly in the daytime and is affected by the leaf transpiration rate as well as the temperature.
Starting Page	791
Ending Page	799
Page Count	9
File Format	PDF
ISSN	09123814
Journal	Ecological Research
Volume Number	26
Issue Number	4
e-ISSN	14401703
Language	English
Publisher	Springer Japan
Publisher Date	2011-05-12
Publisher Place	Japan
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	CO$_{2}$ efflux Leaf transpiration Midday depression Photosynthesis Root respiration Evolutionary Biology Plant Sciences Behavioural Sciences Ecology Zoology Forestry
Content Type	Text
Resource Type	Article
Subject	Ecology, Evolution, Behavior and Systematics

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