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El desgaste micorrízico de la apatita como una importante fuente de calcio en los ecosistemas forestales pobres en

Joel D Blum¹, Andrea Klaue, Carmen A Nezat

¹Department of Geological Sciences, University of Michigan, 425 East University Avenue, Ann Arbor, Michigan 48109, USA. jdblum@umich.edu

|June 18, 2002

Resumen

Los bosques en el noreste de los EE.UU. están perdiendo calcio debido a la deposición ácida. La intemperie de Apatite proporciona una importante fuente de calcio, utilizada por los árboles, lo que podría ayudar a la recuperación del ecosistema.

Área de la Ciencia:

Ecología forestal ecología forestal.
La geoquímica es la geoquímica.
Ciencias ambientales Ciencias ambientales.

Sus antecedentes:

El agotamiento del calcio en los bosques del noreste de los Estados Unidos está relacionado con la deposición ácida, lo que dificulta la recuperación del ecosistema.
Las fuentes de calcio existentes (deposición atmosférica, intemperie de silicatos) no equilibran las salidas de calcio observadas en las corrientes forestales.
Se sospecha la pérdida de calcio de las piscinas de suelo intercambiables y orgánicamente unidas.

Objetivo del estudio:

Investigar las fuentes de calcio en el bosque experimental de Hubbard Brook.
Cuantificar la contribución de la disolución de apatita a los presupuestos de calcio de los bosques.
Determinar el papel de las micorrizas en la absorción de calcio de la apatita.

Principales métodos:

Análisis de las abundancias de calcio y estroncio.
Medición de las relaciones de isótopos de estroncio.
Examen de muestras de suelo, vegetación e hidrológicas.

Principales resultados:

Disolución de apatita identificada como una fuente de calcio comparable a la deposición atmosférica y al desgaste de silicatos.
El calcio derivado de la apatita es utilizado principalmente por las especies de árboles ectomicorrizales.
La absorción de micorrizas puede pasar por alto la piscina de suelo intercambiable.

Conclusiones:

El clima apático puede contribuir significativamente al calcio en los ecosistemas forestales.
Las asociaciones micorrizales juegan un papel clave en el acceso al calcio derivado de la apatita.
El desgaste de apatita debe considerarse al evaluar la acidificación del suelo y los impactos del ciclo del calcio.

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