Formación de agregados del suelo y almacenamiento de carbono por lombrices de tierra endogéicas en un Ultisol
DOI:
https://doi.org/10.18779/cyt.v18i2.846Palabras clave:
Bioturbación, carbono orgánico del suelo, materia orgánica, isotopo, suelos tropicalesResumen
El rol de los micro y macroorganismos del suelo en la incorporación de carbono a los agregados del suelo ha sido poco estudiado en los suelos tropicales. Para evaluar la formación de agregados del suelo y la incorporación de carbono mediante la actividad de las lombrices de tierra, realizamos un experimento de campo en un bosque secundario en la Universidad de Puerto Rico en Mayagüez. Utilizamos la abundancia natural de C13 en la vegetación y la diferencia del isótopo de 13C entre plantas C3 y C4 para rastrear las fuentes de carbono dentro de los agregados del suelo. Se utilizaron hojas de maíz para rastrear la incorporación de carbono C4 en los agregados del suelo, permitiendo una clara distinción entre esta fuente de carbono y el carbono C3 derivado de la vegetación del bosque. Se colectaron muestras de lombrices de tierra y suelo (Typic Haplohumults) a una profundidad de 0-10 cm. Las clases de tamaño de los agregados se separaron por el método de tamizado húmedo. En el sitio de estudio se encontraron dos especies de lombrices de tierra pertenecientes a las categorías ecológicas epigéicas y endogéicas. En un período de 6 meses, nuestros resultados sugieren que la especie endogéica P. corethrurus puede reorganizar pequeños macroagregados para formar grandes macroagregados. Nuestros resultados sugieren que P. corethrurus muestra una preferencia por consumir carbono derivado del suelo y puede translocarlo desde los microagregados a los macroagregados mediante la reestructuración de los agregados del suelo.
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Derechos de autor 2025 Mauricio Renato Morejón Centeno, Rocio Natividad Morejón Lucio, José Nolberto Macías Veliz
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