Simulation of Maintenance Respiration in Wheat (Triticum aestivum L.)
نویسندگان
چکیده
Respiration has a profound influence on crop yield because dry matter accumulation by a crop is closely related to assimilation of CO and respiratory activity. This paper describes the development of a 2 simulation model for respiration in wheat. While the growth respiration can be assumed to be proportional to the assimilation of CO , the model concentrated on the effects of biotic and environmental factors on 2 maintenance respiration. The model was based on the effect of temperature, water stress and dry matter accumulation on maintenance respiration. It also includes the changes in the rate of maintenance respiration during ontogeny. Since the most important maintenance process in plants is protein turnover an alternative approach was to model the maintenance respiration based on nitrogen content. Diurnal temperature variation was considered to simulate the temperature effect on biomass-based rate of respiration using daily maximum and minimum temperatures as inputs, while the Q concept for the N-content based model was used. The 10 models were used to estimate seasonal maintenance respiration. The simulation results highlighted the practical difficulties in application of a constant value of maintenance respiration to a crop simulation model. It is concluded that the dry weight based model simulates maintenance respiration better than the N-content based model because maintenance respiration is not solely related to protein turnover.
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