Modeling ‘Tempranillo’ grapevines with “VitiSim”, a simplified carbon balance model: understanding water status effects
A carbon balance model (VitiSim) was used for assessing the effects of vine water status on the carbon balance and dry matter production of 'Tempranillo' grapevines (Vitis vinifera L.) grown in two different regions of Spain. Inputs for this model included weather daily data, stem water potential measurements and vineyard system data. Partitioning is based on the supply and demand balance using relative sink strength partitioning coefficients when carbon supply is lower than demands. A new routine to account for the effect of plant water status on photosynthesis rate by means of an experimental equation was implemented in the model. Moreover, the role of reserves was revised from an earlier version. Experimental data from two Spanish locations and two seasons (2008 and 2009) were used: Requena (Valencia) and Badajoz (Extremadura). These experiments comprised well-watered and water-stressed plants. Simulated dry matter productions were realistic in behavior even though the amounts were underestimated. However, the model was able to reproduce the effect of water stress on dry matter production observed in the field. This model appears to be a useful tool to estimate crop load from plant and weather data; however, further improvements are required to improve its reliability.
Mirás-Avalos, J.M., Uriarte, D., Lakso, A.N. and Intrigliolo, D.S. (2017). Modeling ‘Tempranillo’ grapevines with “VitiSim”, a simplified carbon balance model: understanding water status effects. Acta Hortic. 1177, 391-398
carbon partitioning, dry matter, photosynthesis, Vitis vinifera, water stress