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F de Tombeur¹, B L Turner², E Laliberté^3,4

¹TERRA Teaching and Research Centre, Gembloux Agro-Bio Tech, University of Liege, 5030 Gembloux, Belgium. felix.detombeur@uliege.be.

Science (New York, N.Y.)

|September 5, 2020

Resumen

El ciclo de silicio terrestre cambia de procesos basados en el suelo a procesos impulsados por plantas durante dos millones de años. La retención de silicio en las plantas es crucial para los ecosistemas pobres en nutrientes, destacando el silicio

Área de la Ciencia:

Ciclos biogeoquímicos
Desarrollo del ecosistema terrestre
Ciencias del suelo

Sus antecedentes:

El ciclo global del silicio es vital para la productividad primaria y el ciclo del carbono.
Los cambios a largo plazo en las fuentes terrestres de silicio y el ciclo no se comprenden bien.
La disponibilidad de silicio está influenciada por el desgaste del suelo y los procesos biológicos.

Objetivo del estudio:

Investigar los cambios en el ciclo del silicio terrestre durante el desarrollo del ecosistema a largo plazo.
Comprender los controles sobre la disponibilidad de silicio en suelos envejecidos.
Explorar el papel de las plantas en el mantenimiento del ciclo del silicio en entornos pobres en nutrientes.

Principales métodos:

Análisis de cronosecuencias de suelo de 2 millones de años en Australia Occidental.
Comparación de las fuentes de silicio (pedológicas frente a las biológicas) según las edades del suelo.
Medición de las concentraciones foliares de silicio en relación con la edad del suelo y la intemperie.

Principales resultados:

Las transiciones del ciclo del silicio terrestre desde el control pedológico al biológico durante 2 millones de años.
La disponibilidad de silicio cambia de fuentes pedogénicas en suelos jóvenes a plantas de reciclaje en suelos viejos.
Las concentraciones foliares de silicio aumentan con la edad del suelo, en contraste con la disminución de los principales nutrientes.

Conclusiones:

La retención de silicio por parte de las plantas sostiene el ciclo terrestre, especialmente en suelos desgastados y pobres en nutrientes.
El desarrollo del ecosistema conduce a un dominio biológico en el ciclo del silicio.
El silicio juega un papel crítico en la adaptación y supervivencia de las plantas en entornos limitados en nutrientes.

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