Abstract
SummaryThis paper deals with the modelling of the equivalent “whole plant” conductance (gs) of roses in greenhouse conditions. The purpose was to provide more information about gs as a key control variable of gas exchange and its variation with respect to relevant environmental or plant variables. Using previously published data on seasonal gas exchange of whole rose plants in the glasshouse and assuming the whole plant behaves like a “big leaf”, two schemes of modelling the stomatal conductance were adopted: (i) the multiplicative model of Jarvis (J model) assuming that gs is driven by microclimatic factors, and (ii), the conductance-assimilation model of Ball, Woodrow and Berry (B model) that describes gs with respect to net CO2 assimilation (An) and environmental variables at the leaf surface. Identification of the model parameters were performed with a data set corresponding to the spring season and showed that the performances of both models depend upon the characterization of humidity (air vapour pr...
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