PHYSICAL AND BIOLOGICAL MEASUREMENTS APPLIED TO DEGRADATED AREAS RECCOVERING: EVALUATION OF EDAFICS AND FITOSSOCIOLOGICAL CHANGES

ABSTRAT

At September 1994, the adoption of physical and biological techniques (Cushions) in a talude of 70° with exposed "C" horizon, brought environmental benefits, allowing the establishment and development of species in a spontaneous way. The objective of this project was made to evaluate the edafic and fitossociological changes, provided by these conservation procedures applied in 4 treatments, with identical geological and environmental characteristics, differing only by the number of cushions determined by the spacing among them. The values of spontaneous plant colonization observed at the control treatment, obtained after 17 years of the disturbance showed only 4 species, distributed in 3 family. At the treatments with conservation procedure, after a period of 3 years there was an increase of this number to 20 species, distributed in 8 botany family, which characterize the level of emergent properties. The authors verified a large association among edafics and biotics factors, with values of granulometric distribution, soil density and organic carbon that would be an evidence of modifications in the properties of the substratum.

Key words:
Reclamation area; Degradated lands; Ecological succesion