Evaluación de indicadores biológicos en suelos de la región semiárida pampeana central

  • Romina Fernández INTA Anguil. La Pampa, Argentina.
  • Ileana Frasier INTA Anguil. La Pampa, Argentina.
  • Marcela Rorig CIRN Suelos, INTA Castelar. Buenos Aires, Argentina.
  • Alberto Quiroga INTA Anguil. La Pampa, Argentina. Universidad Nacional de La Pampa. La Pampa, Argentina.
  • Elke Noellemeyer Universidad Nacional de La Pampa. La Pampa, Argentina.


En la región semiárida pampeana aún no se han usado indicadores biológicos para valorar cambios en la calidad del suelo relacionados con el uso de la tierra. El objetivo de este trabajo fue caracterizar, evaluar y obtener valores de línea de base de respiración de suelo, biomasa microbiana y cociente metabólico en suelos de la región semiárida pampeana bajo vegetación natural y agricultura. El estudio se desarrolló en Paleustoles petrocálcicos de la planicie con tosca de la región semiárida pampeana central. Determinamos los contenidos de arcilla y limo, la porosidad total, el contenido de carbono y nitrógeno, la respiración y la biomasa microbiana, la relación hongo/bacteria y el cociente metabólico en los estratos superior, medio e inferior de dos suelos con vegetación natural y otros dos bajo uso agrícola. El tipo de uso del suelo influyó significativamente sobre la actividad y el tamaño de la biota, de manera tal que los suelos agrícolas, con menores contenidos de carbono y nitrógeno, tuvieron una menor respiración y menores contenidos de carbono y nitrógeno en la biomasa microbiana, en relación con los suelos bajo vegetación natural. El cociente metabólico no presentó diferencias entre suelos bajo distinto uso, por lo que no fue de utilidad para indicar el estado de degradación edáfico, en comparación con la biomasa microbiana y la respiración. El uso del suelo también afectó la relación hongo/bacteria, ya que la participación de hongos en la biomasa microbiana de los suelos bajo uso agrícola fue considerablemente menor que la de los suelos bajo vegetación natural. Estos resultados nos permitieron establecer valores umbrales y de línea de base para la respiración del suelo y el carbono de la biomasa microbiana.


Biografía del autor/a

Romina Fernández, INTA Anguil. La Pampa, Argentina.
Investigadora en Manejo de Suelos
Ileana Frasier, INTA Anguil. La Pampa, Argentina.
Investigadora en Biología de Suelos.
Marcela Rorig, CIRN Suelos, INTA Castelar. Buenos Aires, Argentina.
Invetigador en Microbiología de Suelos
Alberto Quiroga, INTA Anguil. La Pampa, Argentina. Universidad Nacional de La Pampa. La Pampa, Argentina.
Investigador en Manejo de Suelos
Elke Noellemeyer, Universidad Nacional de La Pampa. La Pampa, Argentina.
Catedra de Edafologia y Manejo de Suelos.


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Evaluación de indicadores biológicos en suelos de la región semiárida pampeana central