Molecular Characterization of Humic and Fulvic Acids of Waterlogged and Well-Drained Amazonian Podzols.

ABSTRACT: The Amazon rainforest is the largest tropical rainforest in the world. Amazonian Podzol soils, characteristic of this region, are known to store substantial amounts of organic carbon in both their surface and deep horizons. Despite decades of research, the molecular-level composition of these soils remains uncharacterized. This study addresses this knowledge gap by employing ultrahigh resolution mass spectrometry, namely, Fourier transform-ion cyclotron resonance-mass spectrometry (FT-ICR-MS), to determine the molecular composition of humic acid (HA) and fulvic acid (FA) fractions from two Amazonian Podzol profiles of varying levels of groundwater exposure (waterlogged vs well-drained). In the waterlogged soil compounds containing nitrogen, sulfur, or phosphorus (NSP) decreased with increa

SUBMITTER: Tadini AM 

PROVIDER: S-EPMC12635939 | biostudies-literature | 2025 Nov

REPOSITORIES: biostudies-literature