f0d3b17f-67e5-4db9-bda5-4f47be026329 eng FAO GIS Manager FAO GIS UNIT GIS-Manager@fao.org 2012-05-24T17:14:21 ISO 19115:2003/19139 1.0 3 5 5 false WGS 1984 Agricultural Systems at Risk: human pressure on land and water 2011-11-30T14:51:00 This map shows to which extent rainfed and irrigated agricultural systems as identified on SOLAW Map 1.3: "Major agricultural systems” suffer from land and / or water scarcity. Land scarcity in rainfed agriculture was assessed by comparing the rural population density, (obtained from GRUMP 2000, adjusted for UN data, excluding the urban areas indicated on the GRUMP dataset) with the suitability for rainfed crops as mapped for the Global Agro-ecological Zones 2000. Since land that is very suitable for rainfed agriculture can sustain more people than land that is not suitable, it was assumed that each suitability class has its own carrying capacity regarding population. On the map, land is considered scarce if the population density is higher that the highest quintile in the density distribution for each suitability class. Land scarce areas in climates with an Aridity Index lower than 0.5 (where the Aridity Index is defined as Yearly Precipitation divided by Yearly Reference Evapotranspiration) are considered both land and water scarce. Water scarcity in irrigated areas was assessed by combining “Map 1.2: Global distribution of physical water scarcity” with the Global Map of Irrigation Areas. The areas equipped for irrigation are considered water scarce if already more than 10% of the renewable water resources in the river basin is consumed by irrigated crops. Map published in SOLAW report "Managing Systems at Risk" Jippe Hoogeveen Food and Agriculture Organization of the United Nations - Land and Water Division Water Resources Officer Viale delle Terme di Caracalla Rome 00153 Italy jippe.hoogeveen@fao.org Hubert George Food and Agriculture Organization of the United Nations - Land and Water Division Senior Officer Viale delle Terme di Caracalla Rome 00153 Italy Hubert.George@fao.org map3_2systems_at_risk_s.png thumbnail png map3_2systems_at_risk.png large_thumbnail png SOLAW Managing Systems at Risk land scarcity water scarcity agricultural systems AQUAMAPS_analyses World eng boundaries -180 180 -90 90 The spatial data used to produce the map are listed below: GRUMP – Global Rural-Urban Mapping Project at 30 arc-sec (http://sedac.ciesin.columbia.edu/gpw/) Suitability for rain-fed crops at 5 arc-min (Fischer et al., 2002) -Global Map of Aridity at 10 arc-min (FAO) -Global map of irrigation areas at 5 arc-min (Siebert et al., 2007) -Global Administrative Unit Layers (GAUL 2008) http://www.fao.org/nr/solaw WWW:LINK-1.0-http--link SOLAW website http://www.fao.org:80/geonetwork/srv/en/resources.get?id=38213&fname=3_2_LW_scar.zip&access=private WWW:DOWNLOAD-1.0-http--download 3_2_LW_scar.zip http://data.fao.org/maps/wms?styles=solaw_lw_scar_38213_style OGC:WMS-1.1.1-http-get-map SOLAW:lw_scar_38213 Agricultural Systems at Risk: human pressure on land and water