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Global Agro-Ecological Zones v4 – Model documentation











Fischer, G., Nachtergaele, F.O., van Velthuizen, H.T., Chiozza, F., Franceschini, G., Henry, M., Muchoney, D. and Tramberend, S. 2021. Global Agro-Ecological Zones v4 – Model documentation. Rome, FAO. 




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    Consultation for the identification of global data for the new Global Agro Ecological Zoning database
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    The Global Agro-Ecological Zoning version 4 (GAEZ v4), launched on June 17th 2021, uses well-established land evaluation principles to assess natural resources for finding suitable agricultural land utilization options. It is based on agro-climatic assessments, models, natural and human resources, crop statistics and water use at global scale. With the increasing complexity and intensity of environmental and social challenges an improved understanding of the physical drivers of climate change is necessary. Consequently, a systematic and harmonized update of the global datasets is intended for the further development of GAEZ. The main strategic goal of new version of GAEZ (version 5) is to make the outputs of the system available to national entities to support wise land use decision-making. To this end, supported by the GAEZ Partnership, GAEZ v5 will provide dynamically updated AEZ information, to meet local to global level AEZ users’ need. To refine the overall GAEZ assessment, additional layers will be included in the land resources and climate database. Appendix 1 “Recommendations for further GAEZ development”) of the GAEZ v4 Model Documentation1 provides a list of potential database updates and improvements including for climate (both base-line and climate projections), land cover/land use, soil (with improved detail of processes such as land degradation) and ancillary datasets used for reporting and planning (e.g. areas reserved for environmental protection and maintenance of biodiversity, population density, livestock, administrative boundaries) GAEZ makes use of best available global spatial databases to estimate the biophysical crop production potential for over 100 crops and crop sub-types. The estimation procedures consecutively consider factors relevant for crop production over time and for different management conditions. An overview of the overall GAEZ v4 model structure and data integration is shown in Figure 1 and detailed information about the process and methodology are provided in the Model Documentation.
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    Booklet
    Modernizing Global Agro-Ecological Zoning with new methods: Report of proceedings, 24 March 2022 2022
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    The Global Agro-Ecological Zoning version 4 (GAEZ v4), launched on 17 June 2021 uses well-established land evaluation principles to assess natural resources for finding suitable agricultural land utilization options. It is based on agro-climatic assessments, crop modelling, natural and human resources, crop statistics and water use at global scale. With the increasing complexity and intensity of environmental and social challenges an improved understanding of the biophysical determinants for agricultural management decisions including physical drivers of climate change is necessary. The main strategic goal of GAEZ v5 is to make the outputs of the system available to national entities to support wise land use decision-making. To this end, supported by a GAEZ Partnership, GAEZ v5 will provide dynamically updated AEZ information, to meet local to global level AEZ users’ needs. To refine the overall GAEZ assessment, there was an initial consultation on the data used for GAEZ v5 in December 2021. Additional recommendations for updates, refinements and extensions of approaches and modules are listed in the Appendix 1-1 (“Recommendations for further GAEZ development”) of the GAEZ v4 Model Documentation.
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    Afghanistan's Agro-ecological zoning atlas. Part 2: Agro-ecological assessments
    A study of the International Institute for Applied Systems Analysis (IIASA) in collaboration with FAO
    2022
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    Agriculture is crucial for the national economy of Afghanistan and in particularly so for the agriculturally dependent population which is constituting 60 percent of the total population. Adoption of new strategies for agriculture monitoring, rural land use planning and land management are urgently required to reduce hunger and poverty among rural population and to assure sustainable food and feed production for future generations. The availability of reliable information on natural resources and agriculture for its monitoring and analysis is indispensable to development and implementation of such strategies. However, productivity in the agricultural sector has been relatively low. Afghanistan has the potential to increase its output of cereals, fruits and vegetables. For this purpose, the project “Strengthening Afghanistan Institutions’ Capacity for the Assessment of Agriculture Production and Scenario Development” (GCP/AFG/087/EC), funded by the European Union, is implemented by the Ministry of Agriculture, Irrigation and Livestock (MAIL) and the Food and Agriculture Organization of the United Nations (FAO). Among the project objectives are improving the understanding of the country’s national resources endowment and limitations as well as assessing agricultural production capacities under current climatic conditions and likely impacts of climate change. Within the context of this project the Food and Agriculture Organization of the United Nations (FAO) and the International Institute for Applied Systems Analysis (IIASA) support and implement a National Agro-Ecological Zoning activity in Afghanistan (NAEZ) which assesses quality and availability of land resources and identifies crop cultivation potentials - suitable area, production and attainable yield - under prevailing soil and terrain conditions and for given current or future agroclimatic conditions. One of the outputs of the NAEZ activities is this Agro-Ecological Zones Atlas which is based on applications of the FAO/IIASA National Agro-Ecological Zoning system for current and future climates. The Atlas provides two distinct parts, namely:

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