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Article

Risk Assessment of Irrigation-Related Soil Salinization and Sodification in Mediterranean Areas

1
Escola Superior Agrária, Instituto Politécnico de Beja, R. Pedro Soares S/N, 7800-295 Beja, Portugal
2
GeoBioTec, Universidade Nova de Lisboa, Campus da Caparica, 2829-516 Caparica, Portugal
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Instituto de Ciências da Terra (ICT), IIFA, Universidade de Évora, 7000-671 Évora, Portugal
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LEAF—Centro de Investigação em Agronomia, Alimentos, Ambiente e Paisagem, Instituto Superior de Agronomia, Universidade de Lisboa, 1349-017 Lisboa, Portugal
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Departamento de Física, Escola de Ciências e Tecnologia, Universidade de Évora, 7000-671 Évora, Portugal
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Earth Remote Sensing Laboratory (EaRSLab), Universidade de Évora, 7000-671 Évora, Portugal
*
Author to whom correspondence should be addressed.
Water 2020, 12(12), 3569; https://doi.org/10.3390/w12123569
Received: 27 November 2020 / Revised: 15 December 2020 / Accepted: 16 December 2020 / Published: 19 December 2020
Salinization and sodification are important processes of soil degradation affecting irrigated lands. A large proportion of the global irrigated area is affected by some degree of soil salinity or sodicity caused by the intensification of irrigation. The increase of the frequency of adverse climatic conditions, like high temperatures and variations in precipitation patterns caused by climate change, will potentially amplify these processes in arid, semi-arid, and Mediterranean areas. The use of integrated approaches for the spatial and temporal prediction of the risk of salinization and sodification in irrigated areas is of great value, helping in the decision-making regarding land uses and choice of more suitable agricultural practices. In this study, based on key criteria for the assessment of irrigation-related salinization processes (e.g., climate, topography, soil drainage, water quality for irrigation, and crop irrigation method), we developed a methodology for the prediction of soil salinity and sodicity risk in irrigated lands, using two composite indices, the Salinization Risk (RSA) index and the Sodification Risk (RSO) index. The application of these indices to a real scenario (a Mediterranean area in Southern Portugal) showed that 67% of the potentially irrigated area presented a low risk of salinity development, 68% had a moderate risk of sodification, and 16% was of high risk of sodicity development. Areas under moderate risk of salinization (26%) were mostly characterized by low slopes and fine-textured soils, like Luvisols and Vertisols, with limited drainage conditions. Areas with high risk of soil sodification presented a large incidence of low slope terrain, moderate-to-restricted soil drainage, in high clay content Luvisols, Vertisols and Cambisols, and land use dominated by annual crops irrigated with surface or sprinkler systems. These risk prediction tools have the potential to be used for resource use planning by policymakers and on-farm management decision by farmers, contributing to the sustainability of irrigated agriculture in Mediterranean regions. View Full-Text
Keywords: soil salinity; soil sodicity; water quality for irrigation; risk evaluation; Mediterranean regions soil salinity; soil sodicity; water quality for irrigation; risk evaluation; Mediterranean regions
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MDPI and ACS Style

Tomaz, A.; Palma, P.; Fialho, S.; Lima, A.; Alvarenga, P.; Potes, M.; Costa, M.J.; Salgado, R. Risk Assessment of Irrigation-Related Soil Salinization and Sodification in Mediterranean Areas. Water 2020, 12, 3569. https://doi.org/10.3390/w12123569

AMA Style

Tomaz A, Palma P, Fialho S, Lima A, Alvarenga P, Potes M, Costa MJ, Salgado R. Risk Assessment of Irrigation-Related Soil Salinization and Sodification in Mediterranean Areas. Water. 2020; 12(12):3569. https://doi.org/10.3390/w12123569

Chicago/Turabian Style

Tomaz, Alexandra, Patrícia Palma, Sofia Fialho, Ana Lima, Paula Alvarenga, Miguel Potes, Maria J. Costa, and Rui Salgado. 2020. "Risk Assessment of Irrigation-Related Soil Salinization and Sodification in Mediterranean Areas" Water 12, no. 12: 3569. https://doi.org/10.3390/w12123569

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