Relación suelo – vegetación de la depresión salina del norte de Villa Mercedes (Argentina).

Abstract

Due to the existence of complex space gradients and temporary of salinity and humidity in the soils, the halophyte vegetation is presented in fringes. Our objective was to characterize the soils and to explain the distribution of the vegetation of the nor-northeast sector of the city of Villa Mercedes. The study sector is located to scarce 5 km of this (33º 37´ of south latitude and 65º 25´ of west longitude) presenting a height of 505 msnm and understanding some 200 has. The soils of these sectors were characterized and classified as saline-sodic. The results show that as you advance from the “monte halófilo” (higher sector) toward the “playa salina” (lower area), the superficial salinity increases and it diminishes the depth to the phreatic mantle. The analysis of the data of CE, Mg2+ and Cl- it shows you differ statistically significant for physiognomic types and depth (p <0.05). The pH and the K+ only show differences for the physiognomic types. In general, all the parameters diminish from surface. Differ significant for depth they were opposing for CE, Mg2+, Na+, Cl-, and RAS. A direct regression was obtained for Na+ with regard to Cl - and SO4 = (r2 = 0.9838). You conclude that the zonation of the vegetation halophyte responds, at first, to the factors depth to the phreatic mantel and salinity.