Humic Substances of Spodic Horizons in the Coastal Plain of São Paulo State

摘要: The most common soils that occurred in environments generically called restinga are podzols characterized by the presence of spodic horizon (Bh or Bhm). There few scientific studies related to genesis these tropical regions, and there detailed assessing chemical characteristics composition organic matter (OM) present soils, as well their relations with time. cities Cananeia Bertioga were selected for this research due different sedimentary units remaining vegetation. characterization humic acids (HA) was realized using spectroscopic techniques like Fourier transform infrared spectroscopy (FTIR) fluorescence. Samples extracted from podzol horizons order achieve more details about OM relate results stability carbon mean residence time (MRT) OM. main hypothesis tested profiles where has less MRT would have highest contents recalcitrant compounds. In context, objectives follows: older those concentrations compounds, especially subsurface This inference may indicate transcurrent time, tends undergo changes its become recalcitrant.