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      Caracterización de ultisoles en la cuenca del río capaz,Mérida-Venezuela Translated title: Characterization of ultisols in the capaz river basin, Merida-Venezuela

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          Abstract

          Catorce Ultisoles desarrollados sobre lutitas fueron caracte­rizados en la cuenca del río Capaz, Mérida-Venezuela. La textura fina, reacción ácida, dominancia de minerales resistentes a la alteración y coexistencia en la fracción arcilla de caolinita bien cristalizada e ilitas degradadas con interestratificados desorganizados y vermiculitas bien crista­lizadas se asocia a la herencia de la roca madre (lutitas cretácicas ácidas que han sufrido varios ciclos de transfor­mación) y a una alteración moderada. El desarrollo de Ultisoles en la zona estudiada esta fundamentalmente aso­ciado a la presencia de un material parental de origen sedimentario con textura fina y baja reserva de minerales alterables (lutitas), independientemente de las condiciones bio-climáticas.

          Translated abstract

          Fourteen mudstone-formed Ultisols located in Capaz River basin (Mérida, Venezuela) were characterized. Aspects such as fine texture, acid reaction, abundance of resistant materials, and coexistence of well-crystallized clay fraction kaolinite, degraded illite through interstratified minerals under disorder arrangement, and well-crystallized vermiculite are associated with inheritance from parent rock (cretaceous and acid mudstone having undergone various transformation cycles) and moderate alteration. Ultisols development in the region of this study is mainly related to parent material of sedimentary origin, being characterized by fine texture and low deposits of unstable minerals (lutite or mudstone), independent of the bioclimatic conditions.

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          Fabric and mineral analysis of soils

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            Climatología

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              Géologie des argiles

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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Journal
                at
                Agronomía Tropical
                Agronomía Trop.
                Instituto Nacional de Investigaciones Agrícolas INIA de Venezuela (Maracay )
                0002-192X
                December 2008
                : 58
                : 4
                : 369-382
                Affiliations
                [1 ] Universidad de Los Andes
                [2 ] Laboratorio de Suelos del Instituto de Geografía Venezuela
                Article
                S0002-192X2008000400006
                0aec7105-67c1-4eda-9994-2cebb42b0def

                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
                Humid tropical mountain soils,Ultisols,parent rock,material parental,Suelos de montaña tropical andina,Ultisoles

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