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Modelling the response of wheat canopy assimilation to atmospheric CO 2 concentrations
Author(s) -
Rodriguez D.,
Ewert F.,
Goudriaan J.,
Manderscheid R.,
Burkart S.,
Weigel H. J.
Publication year - 2001
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1046/j.1469-8137.2001.00106.x
Subject(s) - canopy , photosynthesis , stomatal conductance , assimilation (phonology) , biomass (ecology) , atmospheric sciences , environmental science , data assimilation , agronomy , winter wheat , chemistry , botany , meteorology , biology , linguistics , philosophy , physics , geology
Summary• The predictive capacity of two simulation models with different degrees of complexity for the calculation of assimilate production, was tested at different time scales, using a data set of wheat grown in an open‐top‐chamber experiment at two CO 2 concentrations. • Observed values of net canopy assimilation (Pn) were obtained from wheat plants grown at ambient (410 µmol mol −1 ) and elevated (680 µmol mol −1 ) CO 2 mole fractions. Pn was simulated by using either simple multiple regression equations (AFRCWHEAT2) or by highly detailed calculations of leaf energy balances and the coupling of photosynthesis with stomatal conductance (LINTULCC2). • Irrespective of the developmental stage of the crop or variation in weather, the models accurately simulated canopy assimilation and growth. We conclude that the response of aboveground‐biomass production to elevated CO 2 concentrations was explained primarily by the effects of CO 2 on radiation‐use efficiency and assimilate production. • The models explained satisfactorily the daily course of Pn, its integrated daily totals, and the seasonally produced aboveground biomass, both at ambient and elevated CO 2 concentrations. Specific problems in the simulations were identified and discussed.