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      Génesis de un suelo salino-sódico de tucupido, estado guárico-venezuela Translated title: Genesis of a saline-sodic soil in tucupido (guárico-venezuela)

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          Abstract

          Este estudio fue conducido para identificar los principales factores y procesos relacionados con la génesis,bajo condiciones naturales, de un suelo salino-sódico(Sodic Haplusterts, fino, esmectítico, isohipertérmico)en Tucupido (Guárico-Venezuela), con clima semiárido.Allí se evaluaron características y propiedades morfológicas, físicas, químicas y mineralógicas. Valores depH, sodio intercambiable y conductividad eléctricadel extracto de saturación fueron 7,55-8,34; 2-32% y 1,0-8,7 dS m-1; respectivamente. El NaCl fue la saldominante (>66% por debajo de 10 cm). Densidadaparente (Da), macroporosidad y conductividadhidráulica saturada correspondieron respectivamentea 1,8-2,2 Mg m-3, 4-5% y 3x10-7-1x10-5 m s-1. Esmectitas fueron las arcillas dominantes; con cloritas y micas hidratadas también presentes. Adicionalmente,elevadas cantidades de carbonatos de Ca y Mg se encontraron en el suelo (18%). La conclusión es que estossuelos, probablemente, se originaron de la alteraciónde rocas terciarias (limolitas arcillosas calcáreas),formadas en ambientes sedimentarios con aguas salinasricas en sodio, dando lugar a suelos salino-sódicosdurante la fase árida pleistocénica. Su pobre permeabilidad limitó el lavado de sales durante el períodoHoloceno más húmedo. Elevadas conductividades eléctricas y alto contenido de CaCO3 probablemente restringieron elevados porcentajes Na intercambiable (<32%).Las primeras produjeron el colapso del espaciointerlaminar de las esmectitas y los segundos indujeronla formación de silicatos hidratados de Ca-Al quepodrían actuar como agentes cementantes en el espaciointerlaminar de las esmectitas.

          Translated abstract

          Saline-sodic soils, which are rich in salts and sodium, are degraded soils common in zones from subhumid toarid climates. This study was carried out to identifyfactors and processes related with the genesis, undernatural conditions, of a saline-sodic soil (Sodic Haplusterts, fine, smectitic, isohyperthermic) in Tucupido(Guárico-Venezuela), under a semiarid climate. Therewere evaluated morphological, physical, chemical andmineralogical characteristics and properties of the soil.The pH, exchangeable sodium, and electric conductivity(saturation extract) varied between 7.55-8.4; 2-32% and1.0-8.7 dS m-1 respectively. NaCl was the dominantsalt (> 66% below 0.1-m depth). Bulk density, macroporosity, and saturated hydraulic conductivity varied from 1.8 to 2.2 Mg m-3, 4 to 5% and 3x10-7 to 1x10-5 m s-1, respectively. Smectites were the dominating clays, butchlorites and hydrated micas there were present too.High quantities of Ca- and Mg-carbonates were alsofound precipitated in the soil (18%). The conclusionwas that these soils were probably formed by alterationof calcareous shales, formed in sedimentary environments in contact with saline waters rich in sodium, to produce saline-sodic soils during the arid phase at theend of the Pleistocene period. The very low permeabilityof these soils limited salts washing during the wetterHolocene period. High electric conductivities probablywould allow the collapse of interlayer space ofsmectites, and the high content of Ca-carbonates the production of Ca-Al silicate compounds which couldbe acting as cementing agents in the interlayer space ofsmectites, and these processes probably could preventedthe increase of the exchangeable Na% in the soil tovalues higher than 32%.

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          Most cited references40

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          Diagnosis and Improvement of Saline and Alkali Soils

          L Richards (1954)
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            Soil Taxonomy: A Basic System of Soil Classification for Making and Interpreting Soil Surveys

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              SIGNIFICANCE OF CARBONATES IN IRRIGATION WATERS

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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Journal
                at
                Agronomía Tropical
                Agronomía Trop.
                Instituto Nacional de Investigaciones Agrícolas INIA de Venezuela (Maracay )
                0002-192X
                September 2007
                : 57
                : 3
                : 171-188
                Affiliations
                [1 ] Universidad Rómulo Gallegos Venezuela
                [2 ] Universidad Central de Venezuela Venezuela
                Article
                S0002-192X2007000300003
                ea28979f-aefb-447a-a7c3-c98b1708be05

                http://creativecommons.org/licenses/by/4.0/

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                SciELO Venezuela

                Self URI (journal page): http://www.scielo.org.ve/scielo.php?script=sci_serial&pid=0002-192X&lng=en
                Categories
                AGRONOMY

                Horticulture
                Vertisols,calcium carbonate,smectites,high bulk density,Vertisoles,carbonato de calcio,esmectitas,densidad aparente elevada

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