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Publication Type J
Authors Herrero, J. and C. Castaneda
Title Temporal changes in soil salinity at four saline wetlands in NE Spain
Source Catena
Author Keywords Halophytes Hypersaline wetlands Salinity profile Soil salinity Ebro Valley electromagnetic induction satellite data playa-lakes monegros district gypsum paddy variability morphology habitats
Abstract The knowledge of soil salinity and the temporal changes of its distribution in the soil profiles can give warnings for the protection of saline habitats. This study described and compared the salinity profiles of the soils from four hypersaline wetlands at inland, ill-drained depressions in NE Spain, which were sampled throughout the year in 1979-1980 and 1999-2000, and differed in land use. The halophytic communities dictated the location of sampling sites. After the saturated pastes of 404 soil samples were prepared, the electrical conductivity of the extracts (ECe) and the concentrations of major ions were measured, and additional supplementary analyses were performed. A subset of the samples was titrated for calcium carbonate equivalent and gypsum content. ECe and ion concentrations calculated for synthetic soil layers facilitated the comparisons of the vertical distribution of soil salinity among dates, depths, and sites. The shape of the mean ECe profiles over all sampling dates indicated moderate differences between the two wetlands closest to each other, Plan de Callen (PC) and Paul de Almuniente (AL), which had similar (80 dS m(-1) at an 80-cm depth. The shape of ECe profiles at AL, PC, and AG was rather stable overtime, contrasting with the measured desalination of the soil at AL after its conversion into a rice paddy. The changes in the sodium adsorption ratio (SAR) in the soil profiles at AN, PC, and AL are indicators of the potential extremes in the hydric behavior of the soils. At AG, the mineralogical clays are a minor component of these gypseous soils; therefore, the SAR, only, was used as a measure of the relative concentrations of Na+ versus Ca2+ plus Mg2+. The median SAR of all AG soil samples did not differ significantly among sampling sites or dates. The shorter sampling depth intervals used in 1979-80 were responsible for the greater spread in the distribution and the increase in extreme SAR values compared to the data collected in 1999-2000. (C) 2015 Elsevier B.V. All rights reserved.
Author Address [Herrero, Juan; Castaneda, Carmen] CSIC, Estn Expt Aula Dei, Zaragoza 50059, Spain. Herrero, J (reprint author), CSIC, Estn Expt Aula Dei, Ave Montanana 1005, Zaragoza 50059, Spain. jhi@eead.csic.es
ISSN 0341-8162
ISBN 0341-8162
Publication Date Oct
Year Published 2015
Volume 133
Beginning Page 145-156
Digital Object Identifier (DOI) 10.1016/j.catena.2015.04.017
Unique Article Identifier WOS:000359960600015
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