Journal of
Soil Science and Environmental Management

  • Abbreviation: J. Soil Sci. Environ. Manage.
  • Language: English
  • ISSN: 2141-2391
  • DOI: 10.5897/JSSEM
  • Start Year: 2010
  • Published Articles: 311

Full Length Research Paper

Bacterial retention in three soils of the Rolling Pampa, Argentina, under simulated rainfall

Filipe Behrends Kraemer 1, 2*,  Celio Ignacio Chagas1, Carlos Irurtia2 and Lucas Alejandro Garibaldi3, 4  
1Cátedra de Manejo y Conservación de Suelos Facultad de Agronomía, Universidad de Buenos Aires - UBA, Av. San Martín 4453 (1417). CABA, Argentina. 2INTA (Instituto Nacional de Tecnología Agropecuaria), Instituto de Suelos Castelar. Las Cabañas y De Los Reseros s/n (1712) Villa Udaondo Castelar/Hurlingham. Buenos Aires, Argentina. 3Laboratorio Ecotono, INIBIOMA-CONICET y Centro Regional Bariloche-Universidad Nacional del Comahue, Quintral 1250, 8400 Bariloche, Río Negro, Argentina. 4Departamento de Métodos Cuantitativos y Sistemas de Información. Facultad de Agronomía, Universidad de Buenos Aires - UBA, Av. San Martín 4453 (1417). CABA, Argentina.
Email: [email protected]

  •  Accepted: 13 October 2011
  •  Published: 29 November 2011

Abstract

Bacterial retention by soils is a key factor in predicting bacterial transport through surface runoff into water bodies. The objective was to evaluate biological, soil and hydrologic factors that affect bacterial retention in three soil types of the Rolling Pampa, Argentina. Simulated rainfall was applied on field plots previously inoculated with Escherichia coli and simultaneously biological variables such as bacterial adsorption and distribution coefficient were measured at laboratory. Soil variables, particularly pH, exchangeable sodium percentage and organic carbon as well as biological variables proved to be important properties in the regulation of bacterial retention processes. There were no significant differences between the biological variables measured in soils and in the sediments. Most of the microorganisms in the runoff from all sites were either free of (in the < 2 μm sediment fraction) or associated with small soil particles (2 to 50 μm), therefore management practices, such as filter strips, should be regarded with caution when implemented.

 

Key words: Fecal contamination, bacterial transport, bacterial adsorption, distribution coefficient, runoff.