Calibration of a hydraulic architecture-based growth model of cotton plants.

摘要

The AMAPpara model describes long-term plant growth as the cumulative output of the cyclic interactions between plant ecophysiological functioning and architectural development. It is based on the classical relationship between transpiration and biomass production, under the assumption of a constant water use efficiency. Biomass increment is allocated to organs according to their sink strength and their expansion laws. Allometric rules are used to derive the geometry of the organs as a function oftheir volume or biomass. Organ geometry determines the hydraulic architecture of the plant, from which transpiration is computed. Feedback between plant growth and architecture is modelled through a recurrence equation which links the successive growth cycles to each other. Under the assumption that climatic conditions are approximately stable over the whole growth period, the parameters of AMAPpara can be estimated from the observation of plant architecture and morphology at the end of their growth. Apreliminary calibration of the model was carried out for cotton, and yielded quantitatively and qualitatively satisfactory results.