The AEZ assessment framework provides an understanding of future agricultural production, irrigation demand, and development options. The GAEZ update included 2010 baseline database development and production runs for the historical period 1961-2010. A multi-model selection process using recent Intergovernmental Panel on Climate Change model outputs for all four Representative Concentration Pathways was also carried out. Further, the update included a review and some revisions of model parameters, an extension of crops included in the simulations, and the integration of FAO’s water balance and accounting model GlobeWat into GAEZ v4.
The findings confirm that agriculture is by far the most important user of water, with an estimated 70% of global water withdrawals going to agriculture and as much of 90% of consumptive fresh water use due to irrigation.
The GAEZ collaboration between WAT and FAO enhances and strengthens decision support in global applications and national projects, and links WAT to relevant regional and national activities and to a broad and diverse user community.
Figure 1. Agro-ecological-economic suitability of rain-fed rice simulated in AEZ (left) and Distribution of current rice cultivation in Thailand (right)
 Fischer G, Nachtergaele F, Prieler S, Teixeira E, Toth G, van Velthuizen HT,Verelst L, Wiberg D (2012). Global Agro-Ecological Zones (GAEZ v3.0), IIASA, Laxenburg, Austria & FAO, Rome, Italy
Food and Agriculture Organization (FAO), Italy
Last edited: 09 March 2016
International Institute for Applied Systems Analysis (IIASA)
Schlossplatz 1, A-2361 Laxenburg, Austria
Phone: (+43 2236) 807 0 Fax:(+43 2236) 71 313