A SENSITIVE SANDY SOIL UNDER PASTURE AS MICROORGANISM HABITAT PROVIDER

The sandy soils are sensitive ecosystems, being in a precarious equilibrium with the pedolandscape conditions, any changes could bring drastically modifications into soil environment. researches had been performed Suceava Tableland, Stephan Great area, on Luvosol albic-psamic, lamelar. paper focused upper part of argic horizon, Bt1 sub-horizon characteristics at macro- and microscopic scale. In this respect, macro-morphological level, is composed sequence thick lamellae (3–5 cm) separated by inter-lamellar spaces. granulometric analysis showed that medium loamy texture, while spaces coarse composition. At micromorphological image emphasized, lamellae, presence clayey±Fe±humiccoating mineral grains clogging inter-granular results microbiological investigation concentration microorganisms spaces, their development has scarce. total counts bacteria fungi registered low number (16.81 x 106 viable cells g-1d.s. 1.026 103cfus g-1d.s., respectively). Despite these results, data global indicator activity, respiration respectively, attend high level activity (31.357 mg CO2 g-1d.s.). pointed out very environment for life, but clayey±Fe proved to be hospitable habitat.