Abstract
The “Flooding Pampa” is a large area of the coastal plain of Argentina that has frequent floods covering much of the area. General water flow is seaward, but water flow is affected by several anthropic obstacles. These anthropic alterations have created an upstream accumulation of flood water for 70 years. The effects on soil halomorphism and hydromorphism could be recognized only in a narrow strip along the water obstacle. Ponding created a leaching condition that significantly reduced electrical conductivity, pH, and sodium adsorption ratio on the south or the ponded side. On the north, in the discharge zone, the values increased. Free iron oxides increased in the ponded area compared to uninfluenced areas a few hundred meters away from the water barrier. The organic carbon content was not affected.
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