PROTEÇÃO FÍSICA DO CARBONO E NITROGÊNIO POR MEIO DE AGREGADOS DO SOLO SOB SISTEMAS PRODUTIVOS DE CAFÉ
PROTEÇÃO FÍSICA DO CARBONO E NITROGÊNIO POR MEIO DE AGREGADOS DO SOLO SOB SISTEMAS PRODUTIVOS DE CAFÉ
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Palavras-chave: classes de agregados; matéria orgânica; sonificação.
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Keywords: size aggregates classes; organic matter; sonication
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Abstract: The study aimed to analyze changes in the distribution of soil aggregates and occluded carbon (C) and nitrogen (N) stocks in different coffee cultivation systems (CM – monoculture coffee; CCB – coffee consortium + banana; SAF – agroforestry system coffee + grevillea), using a native forest (FN) as a reference. Soil samples were collected at six depths (0-10, 10-20, 20-40, 40-60, 60-80 and 80-100 cm) and fractionated into macroaggregates (2.000-250 μm), microaggregates (250-53 μm) and in the silt + clay fraction (<53 μm), where the aggregates were sonified to quantify occluded C and N. No significant differences were observed between the systems regarding C occluded stock, but for the N occluded stock there was variation between the systems. Coffee systems, in agroforestry systems or monoculture, have great potential for stabilizing C and N in the soil, with values that were closest to FN. The stock of C and N occluded in soil aggregates does not vary between coffee systems, with the exception of losses in N stock in AFS and monoculture. Macroaggregates store more occluded C and N than microaggregates and play an important role in preserving these elements in the soil.
- Everaldo Zonta
- Walleska Pereira Medeiros de Oliveira
- Patrícia Anjos Bittencourt Barreto Garcia
- Paulo Henrique Marques Monroe
- Priscila Silva Matos
- Mylena Raiza dos Santos Silva