Asociación entre comunidades vegetales y algunas propiedades del suelo en el centro de la Depresión del Salado
Abstract
Soils associated with the plant community types of the central Salado River Basin were compared in terms of their horizon sequence and pH and salinity profiles. Consistent differences in the shape of the pH and salinity profiles were assessed by means of a non parametric test. Community types A (Melica brasiliana, Diodia dacycephala, Echium plantagineum) and D (Distichlis spicata, Paspalum vaginatum, Monerma cylindrica) appear to correspond to clearly distinct soil conditions. Stands of community type A occur ora deep, acidic, non salirte, poligenetic soils, while stands of community type D occur ora very shallow, alkaline soils with very high salt content in the upper layer. Community types B (Piptochaetium montevidensis, Ambrosia tenuifolia, Eclipta bellidioides) and C (Mentha pullegium, Leontodon taraxacoides, Paspalidium paludivagum) occur under a variety of soil conditions associated with Natracuols, Argiacuols, arad Argialbols. The soils associated with community type C range from acidic throughout the profile (unit C3) to acidic in the upper and alkaline in the deeper layer (unit C2). Ora average, community type B occurs ora soils with an acidic, non-saline A1 horizon and a .saline, highly alkaline B2 horizon. Differences in environmental restrictions due to the analyzed soil properties do not appear to be enough explanation for the floristic differences between community types B and C. Differences in hydrologic regime and flooding frequency should be also considered.
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