Reabsorción de nitrógeno en gramíneas perennes de diferente palatabilidad, nativas del Caldenal

Autores/as

  • Alicia S. Moretto Centro Austral de Investigaciones Científicas (CONICET). Ushuaia, Argentina
  • Nilda G. Didoné Centro de Recursos Naturales Renovables de la Zona Semiárida (CONICET). Bahía Blanca, Argentina
  • Roberto A. Distel Centro de Recursos Naturales Renovables de la Zona Semiárida (CONICET). Bahía Blanca, Argentina. Departamento de Agronomía (Universidad Nacional del Sur). Bahía Blanca, Argentina.

DOI:

https://doi.org/10.25260/EA.13.23.1.0.1186

Palabras clave:

eficiencia de reabsorción de nitrógeno, proficiencia de reabsorción de nitrógeno, eficiencia de utilización de nitrógeno, Poa ligularis, Nassella tenuissima

Resumen

La reabsorción de nutrientes en las plantas permite su conservación y uso en la construcción de nuevos tejidos, por lo cual podría esperarse que fuera más acentuada en especies adaptadas a crecer con baja disponibilidad de nutrientes. En el Distrito del Caldén, las gramíneas de palatabilidad baja reúnen características distintivas de especies adaptadas a condiciones de poca fertilidad (e.g., tejido esclerenquimatoso abundante, baja concentración de nutrientes), características que en las gramíneas palatables son menos manifiestas. Por lo tanto, cabría esperar una mayor eficiencia y/o proficiencia de reabsorción y de utilización de nitrógeno (N) en Nassella tenuissima Trin. (palatabilidad baja) que en Poa ligularis Nees ex. Steud. (palatabilidad alta). El objetivo de este trabajo fue comparar la dinámica del N en hojas y raíces, vivas y muertas, de ambas especies en distintos momentos del ciclo anual de crecimiento. La concentración de N en los compartimientos analizados fue similar entre especies, o mayor en P. ligularis. Esto determinó una eficiencia y/o proficiencia de reabsorción y de utilización de N similar entre especies, o mayor en N. tenuissima que en P. ligularis. En ambas especies, la eficiencia de reabsorción de N promedio fue mayor a nivel foliar que a nivel radical. Los resultados obtenidos no permiten inferir un comportamiento claramente diferencial en la economía del uso de N entre las gramíneas de baja y de alta palatabilidad del Caldenal.

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Publicado

2013-04-01

Cómo citar

Moretto, A. S., Didoné, N. G., & Distel, R. A. (2013). Reabsorción de nitrógeno en gramíneas perennes de diferente palatabilidad, nativas del Caldenal. Ecología Austral, 23(1), 1–7. https://doi.org/10.25260/EA.13.23.1.0.1186