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Composición de coloides orgánicos en aguas de poro de redox variable dentro de una llanura aluvial montañosa

Brandy D Stewart1, Sharon E Bone2, Eleanor Spielman-Sun1

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La materia orgánica en el agua de poro del suelo cambia con la profundidad a lo largo de gradientes redox. Se encontró materia orgánica rica en carboxilatos, asociada con hierro, en capas de suelo más profundas y reductoras, lo que sugiere un posible transporte a las aguas superficiales.

Palabras clave:
Llanura aluvial alpinaMateria orgánicaMicroscopía de rayos X de transmisión y barridoMicroscopía electrónica de transmisión

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Área de la Ciencia:

  • Ciencias Ambientales
  • Geoquímica
  • Ciencias del Suelo

Sus antecedentes:

  • Los gradientes redox en los sistemas de aguas subterráneas influyen en la producción y el transporte de coloides.
  • La composición orgánica de los coloides se comprende menos que los componentes inorgánicos.
  • La materia orgánica en los coloides desempeña funciones en la asociación de minerales, la complejación de metales y la respiración microbiana.

Objetivo del estudio:

  • Examinar la composición de la materia orgánica del agua de poro a lo largo de un gradiente redox en suelo ribereño.
  • Comprender cómo cambia la química de la materia orgánica con la profundidad y las condiciones redox.

Principales métodos:

  • Análisis de la composición de la materia orgánica del agua de poro a varias profundidades (90-350 cm) en suelo ribereño.
  • Se utilizó microscopía de rayos X de transmisión y barrido correlacionada y microscopía electrónica de transmisión.
  • Datación por radiocarbono del carbono del agua de poro.

Principales resultados:

  • Se observó un cambio en la química de la materia orgánica de rica en carboxilatos a 200 cm (oxic a suboxic con reducción de hierro/sulfato) a rica en fenoles y aromáticos sustituidos en otras profundidades.
  • Se encontró carbono más joven en el agua de poro a 200 cm en comparación con muestras más superficiales y profundas.
  • Se observó un aumento de la materia orgánica disuelta/coloide, el pH, la alcalinidad y la conductividad a 200 cm.

Conclusiones:

  • La química de la materia orgánica del agua de poro del suelo ribereño varía significativamente con las condiciones redox y la profundidad.
  • La presencia de coloides orgánicos ricos en hierro y carboxilatos en profundidades reductoras sugiere un mecanismo potencial de transporte a las aguas superficiales a través del flujo de aguas subterráneas.