Is Dust Derived From Shrinking Saline Lakes a Risk to Soil Sodification in Southern South America?

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dc.contributor.authorBorda, L. G.
dc.contributor.authorCosentino, N. J.
dc.contributor.authorIturri, L. A.
dc.contributor.authorGarcia, M. G.
dc.contributor.authorGaiero, D. M.
dc.date.accessioned2025-01-20T21:09:57Z
dc.date.available2025-01-20T21:09:57Z
dc.date.issued2022
dc.description.abstractDry lakebeds exposed by shrinking water bodies in arid regions constitute sodium (Na)-rich mineral dust emission hotspots that may potentially affect agriculture through soil sodification. However, no soluble Na mass balance has so far been attempted. We modeled 13 years (2005-2017) of dust emission from Mar Chiquita (MC), the most extensive shrinking saline lake in South America. Based on a chemical characterization of dust, we found that a mean similar to 15-150 mg m(-2) of soluble Na was deposited 300 km from the source during the season of strongest dust emissions. We estimated the impact of this atmospheric input on 13 agricultural soils, with different rainfall regimes and water holding capacities. At most sites, dust-equilibrated infiltrated rainfall water had a Na concentration 8-7,000 times lower than the lowest concentration threshold proposed to trigger sodification. Additionally, this rainfall water is diluted similar to 2-20 times as it infiltrates in saturated soils, and its sodium adsorption ratio is probably reduced due to the abundance of soluble calcium and magnesium in the soil solution. Thus, there is no risk of short-term, seasonal sodification, except possibly at two sites and in close proximity to the dust source (<50 km), where dust deposition is maximum. At these sites, we estimated potential dust-related rises in the proportion of soil exchangeable Na. Under scenarios of enhanced salt-rich dust emissions from shrinking lakes in the twenty-first century, agricultural soils close to salt-rich dust sources worldwide should be monitored for potential Na enrichment related to Na-rich dust.
dc.fuente.origenWOS
dc.identifier.doi10.1029/2021JF006585
dc.identifier.eissn2169-9011
dc.identifier.issn2169-9003
dc.identifier.urihttps://doi.org/10.1029/2021JF006585
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/93554
dc.identifier.wosidWOS:000777492400001
dc.issue.numero4
dc.language.isoen
dc.revistaJournal of geophysical research-earth surface
dc.rightsacceso restringido
dc.subjectsoil sodification
dc.subjectdust
dc.subjectMar Chiquita
dc.subjectsaline lake
dc.subjectSouth America
dc.subjectshrinking lake
dc.subject.ods15 Life on Land
dc.subject.ods13 Climate Action
dc.subject.odspa15 Vida de ecosistemas terrestres
dc.subject.odspa13 Acción por el clima
dc.titleIs Dust Derived From Shrinking Saline Lakes a Risk to Soil Sodification in Southern South America?
dc.typeartículo
dc.volumen127
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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