CORDIS proporciona enlaces a los documentos públicos y las publicaciones de los proyectos de los programas marco HORIZONTE.
Los enlaces a los documentos y las publicaciones de los proyectos del Séptimo Programa Marco, así como los enlaces a algunos tipos de resultados específicos, como conjuntos de datos y «software», se obtienen dinámicamente de OpenAIRE .
Resultados aprovechables
Salinization is closely associated with desertification, which is defined as land degradation in arid, semi-arid and dry sub-humid areas resulting from climatic variations and human activities, with the term land including soil, water resources, crops and natural vegetation.
The results of the project: AN INTEGRATED APPROACH FOR SUSTAINABLE MANAGEMENT OF IRRIGATED LANDS SUSCEPTIBLE TO DEGRADATION/DESERTIFICATION showed that:
-Irrigation with saline waters involves a risk of secondary salinization in clay soils irrigated without any drainage system.
-The salinity distribution is related to the presence of clay, with greater values concentrated in the Vertisol area.
-The LEACHM model, if properly calibrated, provides accurate prediction of the water content and of the electrical conductivity.
-Prediction of the hazard of sodification obtained with the LEACHM model is not satisfactory, and needs further investigation and improvement.
-The irrigation system may affect soil structure and bypass flow phenomena, as well as the hazard of salinization at the field scale. Irrigation systems such as micro-sprinkler or sprinkler should be avoided when saline water is used for irrigation.
-Exchange of solutes occurs at the contact surfaces between the macropores/cracks walls and the incoming solution in concomitance with bypass fluxes.
-Alternating low salinity/sodicity water with a high salinity/sodicity solution can be effective for preventing salinization and sodification.
-Cracking and bypass flow decrease the hazard of salinization in clay soil, promoting leaching of solutes. The presence of cracks may increase the efficiency of salt-leaching when a solution having a low salinity is alternated to a solution with a higher salinity.
-When cracks are present, lower leaching fractions could be necessary to remove salts from the soil profile. In addition, the low hydraulic conductivity in the bottom layers of a soil profile is likely to be counterbalanced by the presence of cracks.
-Crop transpiration and yield in presence of cracks are the result of a combined effect of water available and level of salinity, and can be forecast only by models accounting for both the two factors.
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