Evaluación del uso de permanganato de potasio como método para estimar carbono biológicamente activo en suelos agrícolas de la Zona Centro- Sur de Chile.
Date
2025
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Universidad de Concepción
Abstract
Evaluar la calidad del suelo es clave para entender su capacidad de sostener biodiversidad, producción agrícola y retención de nutrientes, agua y carbono. El carbono (C) lábil, fracción fácilmente disponible de la materia orgánica, es fuente de energía para los microorganismos. Se requiere un método sencillo y efectivo para estimar estas fracciones y su relación con la actividad biológica del suelo. Este estudio evaluó el método de carbono oxidable con permanganato de potasio (POX-C) en suelos con distintos manejos agrícolas. Se comparó con indicadores como carbono orgánico total (COT), respiración acumulada (RFA), respiración potencial específica (SPR), actividad microbiana (FDA), actividad enzimática de β-glucosidasa, materia orgánica particulada (POM) y materia orgánica asociada a minerales (MAOM). POX-C mostró correlaciones positivas con el carbono orgánico total y la materia orgánica particulada, pero no con la respiración acumulada ni la actividad microbiana, lo que indica que refleja el reservorio de carbono lábil más que la actividad biológica directa. Así, POX-C se presenta como un indicador confiable de calidad del suelo en agroecosistemas diversos.
Assessing soil quality is essential to understand its capacity to support biodiversity, agricultural production, and the retention of nutrients, water, and carbon. Labile carbon (C), the readily available fraction of soil organic matter, serves as an energy source for microorganisms. A simple and effective method is needed to estimate these fractions and their relationship with soil biological activity. This study evaluated the potassium permanganate oxidizable carbon method (POX-C) in soils under different agricultural management practices. It was compared with indicators such as total organic carbon (TOC), cumulative respiration (RFA), specific potential respiration (SPR), microbial activity (FDA), β-glucosidase enzymatic activity, particulate organic matter (POM), and mineral-associated organic matter (MAOM). POX-C showed positive correlations with total organic carbon and particulate organic matter, but not with cumulative respiration or microbial activity, suggesting it reflects the labile carbon reservoir rather than direct biological activity. Thus, POX-C emerges as a reliable indicator of soil quality in diverse agroecosystems.
Assessing soil quality is essential to understand its capacity to support biodiversity, agricultural production, and the retention of nutrients, water, and carbon. Labile carbon (C), the readily available fraction of soil organic matter, serves as an energy source for microorganisms. A simple and effective method is needed to estimate these fractions and their relationship with soil biological activity. This study evaluated the potassium permanganate oxidizable carbon method (POX-C) in soils under different agricultural management practices. It was compared with indicators such as total organic carbon (TOC), cumulative respiration (RFA), specific potential respiration (SPR), microbial activity (FDA), β-glucosidase enzymatic activity, particulate organic matter (POM), and mineral-associated organic matter (MAOM). POX-C showed positive correlations with total organic carbon and particulate organic matter, but not with cumulative respiration or microbial activity, suggesting it reflects the labile carbon reservoir rather than direct biological activity. Thus, POX-C emerges as a reliable indicator of soil quality in diverse agroecosystems.
Description
Tesis presentada para optar al título de Ingeniero Agrónomo.
Keywords
Permanganato de potasio Pruebas, Carbono, Análisis de suelos, Cuotas de producción agrícola