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ITEM 6. Global Soil Salinity Map: Review the Concept Paper and the Technical Specifications - Yusuf Yigini, Isabel Luotto

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Fourth Working Session of the International Network of Soil Information Institutions (INSII)
6-8 November 2018 | FAO HQ – German Room, Rome, Italy

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ITEM 6. Global Soil Salinity Map: Review the Concept Paper and the Technical Specifications - Yusuf Yigini, Isabel Luotto

  1. 1. Global Soil Salinity Map
  2. 2. Task • Member Countries – GSP 5th Plenary Assembly • COAG 26th – Committee on Agriculture (COAG/2018/12)
  3. 3. Threat Dryland agriculture 2% Total Irrigated land Salt-affected 20% FAO/UNESCO soil map of the world (1970-1980): • Of the 230 million ha of irrigated land, 45 million ha (20 %) are salt-affected • Of the 1500 million ha of dryland agriculture, 32 million (2 %) are salt-affected • Recent global estimations are the result of different methods that are not comparable • Current maps are out of date and too coarse for predicting trends on salinization http://www.fao.org/3/a-i6471e.pdf
  4. 4. Threat Dryland agriculture 2% Total Irrigated land Salt-affected 20% FAO/UNESCO soil map of the world (1970-1980): • Of the 230 million ha of irrigated land, 45 million ha (20 %) are salt-affected • Of the 1500 million ha of dryland agriculture, 32 million (2 %) are salt-affected • Recent global estimations are the result of different methods that are not comparable • Current maps are out of date and too coarse for predicting trends on salinization
  5. 5. Threat Dryland agriculture 2% Total Irrigated land Salt-affected 20% FAO/UNESCO soil map of the world (1970-1980): • Of the 230 million ha of irrigated land, 45 million ha (20 %) are salt-affected • Of the 1500 million ha of dryland agriculture, 32 million (2 %) are salt-affected • Recent global estimations are the result of different methods that are not comparable • Current maps are out of date and too coarse for predicting trends on salinization
  6. 6. Detection, Mapping and Monitoring Proper Soil Management Objectives  Produce a country-driven global map of soil salinity (GSSmap)  Global assessment on salt affected areas  Provide a baseline for soil salinity monitoring  Improve national capacities on salt affected soil management  GloSIS, SoilSTAT  Improve/develop national capacities National Maps Pictures (Spreer, U. Hohenheim)
  7. 7. Progress • Concept Paper – P4WG, ITPS, INSII https://goo.gl/rc6Jef
  8. 8. Data Products Based on the available data, countries will have three options regarding the type of National soil salinity to be provided to create the GSSmap: I - National topsoil salinity map (mandatory): , created with remotely sensed soil salinity indices using Landsat (MSS, TM, ETM) and validated with ground truth (EC, ESP and/or pH) data. II - National root zone salinity map (optional): created with vegetation and soil salinity indices using Landsat (MSS, TM, ETM) in conjunction with terrain attributes derived from a DEM and validated with ground truth (EC, ESP and/or pH) data. III - National subsurface salinity map (optional): , created with terrain attributes derived from a DEM, irrigation water quality, meteorological data, ground water table, land use and measured data. If available, the use of ECa measured with electromagnetic induction could be used to limit the need for soil samples.
  9. 9. Thank You

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