Elsevier

Scientia Horticulturae

Volume 59, Issues 3–4, November 1994, Pages 217-232
Scientia Horticulturae

A simplified model for predicting evapotranspiration rate of nine ornamental species vs. climate factors and leaf area

https://doi.org/10.1016/0304-4238(94)90015-9Get rights and content

Abstract

Measurements of evapotranspiration rate (E) for nine greenhouse ornamental species (Begonia, Cyclamen, Gardenia, Gloxinia, Hibiscus, Impatients, Pelargonium, Poinsettia and Schefflera) have been carried out concurrently with a survey of indoor climate (e.g. solar radiation, G, and vapour pressure deficit, D) and leaf area index (L). Correlations linking E to G, D and L are proposed, based on the formalism of the Penman-Monteith equation: E = Af1(L)G + Bf2(L)D. Calculated short-term (hourly) evapotranspiration rates agree fairly well with measured rates. The information contained in A and B coefficients was analyzed, showing that the species under study have quite different behaviour and sensitivity to G and D, relative to canopy water vapour exchanges. From A and B, estimations of the average values for the leaf stomatal resistance, r1, and leaf aerodynamic resistance, ra, were derived and gave, for most of the species, plausible orders of magnitude for these two resistances.

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