%0 Journal Article
%T Hidromorf¨Şa y condiciones ¨˘cuicas en suelos de la llanura aluvial de Tucum¨˘n (Argentina)
%A Zappino
%A Rodolfo Oscar
%J Ciencia del suelo
%D 2010
%I Scientific Electronic Library Online
%X the profiles of four soils with different drainage types were selected in the alluvial plain of tucum¨˘n in order to analyze the intensity of the hydromorphy and detect which of the soils conforms to an aquic conditions. the four types were: la aguadita (thermic typic udipsamment) (well-drained), la fronterita xi (coarse loamy, illitic, thermic typic hapludoll) (moderately well-drained), la fronterita x (fine loamy, illitic, thermic aquic argiudoll) (imperfectly drained), and famaill¨˘ (fine, illitic, thermic aquic argiudoll) (imperfectly drained). the soils show endosaturation conditions for six months of the year, with an increase in water level during summer-autumn and a decrease in winter-spring. the degree of reduction was assessed in terms of the distribution of iron and manganese associated with redoximorphic features analyzed on a micromorphological scale. in the well-drained and moderately well-drained profiles, fed and mnd show little mobility, with the respective values ranging from 0.50-0.80% and 0.03-0.06%, mnd / fed <0.08% and underdeveloped redoximorphic features. in the profiles with imperfect drainage, the fed sometimes co-migrates with and sometimes separates from clay, with the segregation of fed outside the profile. mnd has low values (0.01-0.06%) with an increase of 0.20% in the bc of la fronterita x, mn/fed = 0.33 and more developed redox features. the analysis suggests that the hydromorphic process increases from the moderately well-drained la fronterita xi profile towards the imperfectly drained la fronterita x and famaill¨˘ profiles. the former two profiles are expressed in the mn/fed ratio and in the increasing size and abundance of redox features as observed on a micromorphological scale; and the famaill¨˘ profile in the low mean value of fed and mn, and the presence of redoximorphic features. the fronterita x and famaill¨˘ profiles present the most reduced conditions among the studied soils and are assumed to conform to an aquic regime.
%K micromorpology
%K redoximorfic features
%K secondary iron and manganese.
%U http://www.scielo.org.ar/scielo.php?script=sci_abstract&pid=S1850-20672010000100009&lng=en&nrm=iso&tlng=en