INBA   12521
INSTITUTO DE INVESTIGACIONES EN BIOCIENCIAS AGRICOLAS Y AMBIENTALES
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Soil microbial communites from argentinean Yungas as affected by agricultural activity.
Autor/es:
TOSI M; WASSERMANN E; MONTECCHIA MS; SORIA MA; CARBONE CARNEIRO M; CORREA OS
Lugar:
Puerto Madryn, Chubut, Argentina
Reunión:
Congreso; XLVI Reunión Anual de la Sociedad Argentina de Investigación en Bioquímica y Biología Molecular; 2010
Institución organizadora:
Sociedad Argentina de Investigación en Bioquímica y Biología Molecular
Resumen:
To evaluate deforestation and long-term agriculture effect on soil microbial communities we sampled soils from two pristine montane forests (M1 and M2), a pristine pedemontane forest (P) and both a 40-year and a 100-year sugarcane monoculture (S40 and S100, respectively). Acid phosphomonoesterase activity (PA) and soil basal respiration (SR) were measured. We also calculate the metabolic quotient (qCO2) or SR per microbial biomass unit, based on data from previous phospholipid fatty acid (PLFA) analysis. Further, community level physiological profiling (CLPP) was used as an indicator of microbial heterotrophic functionality. PA was significantly (p<0,05) higher in pristine soils and also discriminated among them (M1>M2>P). Similarly, pristine soils showed a lower qCO2 value, which evidences microbial communities with higher K-strategists proportion and energetic efficiency. SR could only differentiate M2 from S100, M2 displaying a higher basal activity. CLPP did not show differences between land use, which may suggest the presence of microbial communities with high functional redundancy. Finally, integrated PCA of physico-chemical and biochemical data explained 71% of their variability and showed that AF, qCO2, pH and available P content allowed discriminating pristine from agricultural soils. We propose these variables as suitable soil quality indicators in this region.