DBPapers

THE DYNAMICS OF MICROBIOTA ON SOILS DEGRADED BY MINING ACTIVITIES

AUTHOR/S: S. DUNCA, M. STEFAN, C. TANASE, A. COJOCARIU
Sunday 1 August 2010 by Libadmin2008

8th International Scientific Conference - SGEM2008, www.sgem.org, SGEM2008 Conference Proceedings/ ISBN: 954-918181-2, June 16-20, 2008, Vol. 2, 365-372 pp

ABSTRACT

The aim of this study is to provide data on biological state of soil in depth, using the
comparative study of general microbiota frequency and activity. For the quantitative
analysis of soil microbiota, we have used soil samples for dilutions (10-1 - 10-6). The
results were expressed in colony-forming units/g soil (CFU). The soil was sampling
from Calimani National Park (The Oriental Carpathians) in October 2006, June and
September 2007. The soil microbiota registers quantitative variations from one sample
point to other and between the analyzed depths. The higher number of microorganisms
was registered at Dumitrelu Dump (29 x 106 CFU/g soil), 0-6 cm, and the lower number
of microorganisms was register at Puturosu Dump (172 x 103 CFU/g soil), 0-10 cm. The
number and specific composition of microbiota can vary in accordance with the soils
type and characteristic features. Regarding the vertical distribution of microbiota, the
number of microorganisms present in soil can decrease with depth. We can also find
some sterile layers between that populated by microorganisms. We can suppose that the
continuous decrease of microbiological activity into the inferior layers of soil is due to
air privation, or to soil solution alcalinization, nutritive substances inadequacy, or to the
complex action of all these factors.

Keywords: microbiota, soil, sterile dumps, quantitative variations, depth