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An analysis of the dynamic response of stomatal conductance to a reduction in humidity over leaves of Cedrella odorata

Jarvis, A. J. and Young, Peter J. and Taylor, C. James and Davies, William J. (1999) An analysis of the dynamic response of stomatal conductance to a reduction in humidity over leaves of Cedrella odorata. Plant, Cell and Environment, 22 (8). pp. 913-924. ISSN 0140-7791

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Abstract

Single leaves of 3-month-old Cedrella odorata seedlings were exposed to a step reduction in the ambient dew point. The resultant time series of dynamic variations in leaf surface water vapour concentration, leaf surface water vapour concentration gradient, transpiration rate and stomatal conductance to water vapour, are analysed using the data-based mechanistic (DBM) modelling methodology of Young (e.g. Young & Lees 1992; Minchin et al. 1996). It is shown that the identified second-order, dynamic model between transpiration rate (as the input) and stomatal conductance (as the output) provides an appropriate, physiologically meaningful, description of the system. In particular, the dynamic relationship between these two variables is remarkably linear and can be resolved in terms of two parallel, first-order, subsystems; a model which complements the results of Cowan (1977) for cotton. The model is also compared with the recently published simulation model of Haefner, Buckley & Mott (1997).

Item Type: Article
Journal or Publication Title: Plant, Cell and Environment
Uncontrolled Keywords: data-based mechanistic ; stomatal conductance ; transfer function ; transpiration rate
Subjects: Q Science > QH Natural history > QH301 Biology
Departments: Faculty of Science and Technology > Lancaster Environment Centre
Faculty of Science and Technology > Engineering
VC's Office
ID Code: 8905
Deposited By: Prof William J Davies
Deposited On: 16 May 2008 11:57
Refereed?: Yes
Published?: Published
Last Modified: 24 Jan 2014 05:20
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/8905

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