In:
Functional Plant Biology, CSIRO Publishing, Vol. 27, No. 1 ( 2000), p. 77-
Abstract:
Our previous reformulation of Cowan and Farquhar’s optimality hypothesis
of stomatal reg-ulation has resulted in models for photosynthesis and transpiration which have been readily testable against field data. When
analysing the water use efficiency implied by our previous reformulation of the optimality hypothesis of stomatal regulation, we discovered an unexpected
property: when stomatal reg-ulation is active, a linear relationship could be found between transpiration and a term involving water vapour deficit and
photosynthesis. This prediction gives rise to a novel test which requires no parameter estimation. We conducted such a test in Scots pine, utilising
ca 10 000 measurements of CO2 exchange, transpiration, temperature, PAR, and water vapour concentration,
taken at the SMEAR I measuring station in Finnish Lapland. As predicted, on clear and sunny days the correlation coefficient of the linear relationship
was as high as 0.99, corroborating our formulation of the optimality hypothesis.
Type of Medium:
Online Resource
ISSN:
1445-4408
Language:
English
Publisher:
CSIRO Publishing
Publication Date:
2000
SSG:
12
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