Author(s): RODRIGUES, A. F.; NOVOTNY, E. H.; OLIVEIRA, R. R.

Summary: During the late nineteenth century, some areas in Rio de Janeiro - Brazil - has undergone remarkable transformation of the forest arising from ancient charcoal activity carried out by ex-slaves. Nowadays, in the area of abandoned ancient kilns, it is possible identify charcoal in the soil. The charcoal weathering, in another anthropic soil, the Terra Preta de Índios (TPI), generated a peculiar soil organic matter, i.e very recalcitrant and with high cation exchange capacity (CEC), resulting in a resilient soil against degradation by intensive use. Thus, the structural comparison, by 13C Nuclear Magnetic Resonance, of the humic acids (HA) from paleo-charcoal kiln and from TPI facilitate to confirm the hypothesis that the natural weathering of charcoal in the soil generate this peculiar organic matter. The result showed that the HA from paleo-charcoal kiln in Rio de Janeiro show similar features from TPI, i.e: policondensed aromatic rings heavily functionalised with carboxylic groups.

Publication year: 2014

Types of publication: Paper in annals and proceedings

Unit: Embrapa Soils

Keywords: Carbon, Carbono, Carbono pirogênico, Carvoaria, Carvão vegetal, Charcoal, Ressonância magnética nuclear do carbono-13, Terra Preta de Índios