ISHS Acta Horticulturae 801: International Symposium on High Technology for Greenhouse System Management: Greensys2007
VALIDATION OF CANOPY PHOTOSYNTHESIS MODELS FOR CLIMATE CONTROL IN GREENHOUSES |
| Authors: | M. Sciortino, D. Wulfsohn, A. Andreassen, G. Gianquinto, J.M. Aaslyng |
| Keywords: | greenhouse, modelling, photosynthesis |
| DOI: | 10.17660/ActaHortic.2008.801.160 |
| Abstract:
In the last 30 years methodologies based on ‘gas exchange systems’ have been developed to measure photosynthetic activity. The assessments were particularly useful to evaluate the influences of physiological and environmental factors on the process. The knowledge obtained allowed the development of models to predict photosynthesis as a function of environmental parameters. The objective of this study was to validate four canopy photosynthesis models (combination of 2 different canopy photosynthesis models and 2 leaf photosynthesis models M1a, M2a, M1b M2b ) for Chrysanthemum morifolium L. under different temperature treatments and using climate measurements at canopy level. Models M1a and M2a assume that all leaves have the same photosynthesis in each layer (bottom, medium, top). Models M1b and M2b are based on the Lambert-Beer law, which was used to compute light extinction coefficients (k) for the top, medium and bottom layers. M1a and M1b have shown to overestimate photosynthesis respect to M2a and M2b. Moreover, the introduction of corrective parameters such as photosynthetic active radiation (PAR), CO2 concentration and relative humidity improved considerably the predictive ability of both models without relevant differences between the four models. Therefore, models as developed in the present study could be very useful for on site applications. | |
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