MODELLING EVAPOTRANSPIRATION AND WATER DEMAND OF VEGETABLES INDUCED BY CLIMATE CHANGE FOR IRRIGATION PURPOSES
Vulnerability of vegetable production to climate change is given by the discrepancy between the high water demand of a crop and the water available for irrigation. This vulnerability is evaluated by calculating the climatic water balance for the important growing region Hessian Reed in Germany. Calculations are based on simulation data of regional climate models, whereas meteorological parameter time series are analysed for the growing season for the 30-year periods 1971-2000, 2031-2060 and 2071-2100 under climate change projections by the scenario A1B. Special focus is given on distribution of precipitation and frequency as well as the length of drought periods. Simulations of these quantities highly vary between the regional climate models. However, all used models predict a redistribution of precipitation from summer to winter up to 40% as well as more and longer precipitation-free periods, comparing the future periods 2031-2060 and 2071-2100 with the reference period 1971-2000. Additionally, the results underline, that their transfer into practice requires consideration of more than one regional climate model. Despite the high variation between the models, there is an overall-trend showing an increase in water demand. So, big challenges are the consequences for irrigation management in order to enable vegetable production in the field.
Schmidt, N. and Zinkernagel, J. (2014). MODELLING EVAPOTRANSPIRATION AND WATER DEMAND OF VEGETABLES INDUCED BY CLIMATE CHANGE FOR IRRIGATION PURPOSES. Acta Hortic. 1038, 287-294
climate models, water balance, crop coefficients, Penman equation, FAO Penman-Monteith equation