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Control of transpiration in an irrigated Eucalyptus globulus Labill. plantation


White, D and Beadle, CL and Worledge, D, Control of transpiration in an irrigated Eucalyptus globulus Labill. plantation, Plant, Cell and Environment, 23, (2) pp. 123-134. ISSN 0140-7791 (2000) [Refereed Article]

DOI: doi:10.1046/j.1365-3040.2000.00530.x


Stomatal conductance and transpiration were measured concurrently in an irrigated Eucalyptus globulus Labill. plantation. Canopy stomatal conductance, canopy boundary layer conductance and the dimensionless decoupling coefficient (Ω) were calculated (a) summing the conductance of three canopy layers (g(c)) and (b) weighting the contribution of foliage according to the amount of radiation received (g(c)'). Canopy transpiration was then calculated from g(c) and g(c)' for Ω = 1 (E(eq)), Ω = 0 (E(imp)) and by weighting E(eq) and E(imp) using W (E(Ω)). E(eq), E(imp) and E(Ω) were compared to transpiration estimated from measurements of heat pulse velocity. The mean value of Ω was 0.63. Transpiration calculated using g(c) and assuming perfect coupling (12.5 ± 0.9 mmol m-2 s-1) significantly overestimated measured values (8.7 ± 0.8 mmol m-2 s-1). Good estimates of canopy transpiration were obtained either (a) calculating E(Ω) separately for the individual canopy layers or (b) treating the canopy as a single layer and using g(c)' in a calculation of E(imp) (Ω = 0). The latter approach only required measurement of stomatal conductance at a single canopy position but would be unsuitable for use in combined models of canopy transpiration and assimilation. It should however, be suitable for estimating transpiration in forests regardless of the degree of coupling.

Item Details

Item Type:Refereed Article
Research Division:Agricultural, Veterinary and Food Sciences
Research Group:Forestry sciences
Research Field:Tree improvement (incl. selection and breeding)
Objective Division:Plant Production and Plant Primary Products
Objective Group:Forestry
Objective Field:Hardwood plantations
UTAS Author:White, D (Dr Donald White)
ID Code:20599
Year Published:2000
Web of Science® Times Cited:21
Deposited By:Plant Science
Deposited On:2000-08-01
Last Modified:2011-08-04

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