Photosynthesis–stomatal conductance model LEAFC3-N: specification for barley, generalised nitrogen relations, and aspects of model application
Johannes Müller A B , Henning Braune A and Wulf Diepenbrock AA Martin-Luther-University of Halle-Wittenberg, Institute of Agricultural and Nutritional Sciences, Ludwig-Wucherer-Str. 2, D-06108 Halle (Saale), Germany.
B Corresponding author. Email: johannes.mueller@landw.uni-halle.de
This paper originates from a presentation at the 5th International Workshop on Functional–Structural Plant Models, Napier, New Zealand, November 2007.
Functional Plant Biology 35(10) 797-810 https://doi.org/10.1071/FP08088
Submitted: 19 March 2008 Accepted: 27 August 2008 Published: 11 November 2008
Abstract
We discuss a generalised formulation of the nitrogen-sensitive photosynthesis−stomatal conductance model LEAFC3-N to be used as a submodel of functional–structural plant models (FSPMs) or traditional crop growth models for C3-crops. Based on a parameterisation study for barley, we demonstrate that the large variation of characteristics related to potential leaf photosynthesis and stomatal conductance, along with different factors, can be accounted for by introducing functions that relate parameter values to nitrogen contents. These relationships follow the same pattern for different C3 crops, and their parameters are in close range. The accuracy of the parameters and the minimum simulation time step required for reliable predictions of the integrated diurnal carbon gain (IDC) is assessed. For IDC predictions with an accuracy of about ±5%, the accuracy of the slope of the relationship between maximum carboxylation rate and leaf nitrogen content should be of similar order. For other key model parameters, an error of ±20% or even greater may be tolerated. A time step of 1–2 h will be sufficient to predict IDC with an accuracy of about ±5%.
Additional keywords: leaf gas exchange, model parameterisation, C3 plants, Hordeum vulgare.
Acknowledgements
The authors thank Dr K Egle and Dr H Beschow, Institute of Soil Science and Plant Nutrition, Martin-Luther-University of Halle-Wittenberg, for performing nitrogen analyses and Dipl.-Ing. agr. A Kahlau for performing gas exchange measurements of E1 and E2. The present study was funded by the German Research Association (Deutsche Forschungsgemeinschaft, DFG). The support of the state of Saxony-Anhalt is highly appreciated.
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