Changes in the soil microbian variability by alteration of native forest
Palabras clave: bacteria, variability, soil, erosion, rizosphere
ResumenPresent time, erosion is one of the main environmental problems in Chile, which depresses the soil capability for generating goods and services; besides breaking the synergic relationships between soil and its environment, creating alterations in the ecologic equilibrium of an ecosystem. These variations also alter the soil microbiota in eroded soils or in soils whose native vegetation has been replaced by alien vegetation. To get to know these alterations, a microbial analysis was carried out on the soils of the area of Alto Loica (district of San Pedro de Melipilla, in the Metropolitan Region); which proved a direct relation between the soil status and its bacteria communities. RNA S16 comparative analyses were carried out to on soil bacteria in the rizosphere of a native species: Cryptorcarya alba, an alien tree representative of the area of Alto Loica (eucalyptus cameldulensis), and from eroded soil. Correlation coefficients close to one indicate a high rate of variability when the samples from the rizosphere of Cryptorcarya alba are compared to analyses from samples coming from Eucalyptus cameldulensis and from eroded soils, which points out to the fact that the alteration of vegetation changes drastically the bacterial composition of soils. This represents an indicator reflecting the status of an ecosystem, and how adapted bacteria collaborate in the ecological cycles of the soil. These variations represent a source of future analyses where the bacteria compositions grouped in biological crusts may become a powerful tool to fend off erosion.
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