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Similaridades a escala global en los patrones de liberación de nitrógeno durante la descomposición a largo plazo.

William Parton¹, Whendee L Silver, Ingrid C Burke

¹Natural Resource Ecology Laboratory, Colorado State University, 200 West Lake, Campus Mail 1499, Fort Collins, CO 80523-1499, USA.

Science (New York, N.Y.)

|January 20, 2007

Resumen

La liberación de nitrógeno de la basura en descomposición está controlada principalmente por el contenido inicial de nitrógeno y la masa restante en diversos ecosistemas. Las raíces liberan nitrógeno de manera lineal, con excepciones en praderas áridas debido a la alta radiación UV.

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Área de la Ciencia:

Ecología Ecología Ecología.
Biogeoquímica La biogeoquímica es la bioquímica.
Ciencias del suelo Ciencias del suelo.

Sus antecedentes:

La descomposición de la basura es crucial para el ciclo de nutrientes, ya que suministra nitrógeno mineral (N) esencial para los ecosistemas terrestres.
Comprender los patrones de liberación de nitrógeno es clave para predecir la productividad del ecosistema y la fertilidad del suelo.

Objetivo del estudio:

Investigar los principales impulsores de la liberación neta de nitrógeno durante la descomposición de la basura en varios biomas.
Identificar los factores que influyen en la dinámica del nitrógeno en diferentes tipos de ecosistemas.

Principales métodos:

Se llevó a cabo un experimento de descomposición de 10 años en 21 sitios que abarcan siete biomas.
Se monitoreó la hojarasca y la descomposición de las raíces, midiendo la liberación de nitrógeno y la masa restante.

Principales resultados:

La liberación neta de nitrógeno de la hojarasca fue determinada principalmente por la concentración inicial de nitrógeno en los tejidos y la masa restante, independientemente de las condiciones climáticas o del suelo.
Los pastizales áridos bajo alta radiación UV mostraron una excepción, con liberación de nitrógeno insensible al contenido inicial de nitrógeno.
Las raíces exhibieron liberación lineal de nitrógeno con descomposición y mínima inmovilización neta de nitrógeno.

Conclusiones:

Los patrones a escala global en la liberación neta de nitrógeno durante la descomposición son predecibles y están restringidos por la fisiología del descomponedor.
La calidad inicial de la basura y los factores ambientales influyen significativamente en la disponibilidad de nitrógeno en los ecosistemas terrestres.