Ultra-high resolution mass spectrometry of physical speciation patterns of organic matter in fire-affected soils
ESI-FT-ICR/MS
2. Zero hunger
Pyrogenic organic matter van
Charred biomass
Mediterranean soils particle size fractions
Forests
15. Life on land
Krevelen diagram
01 natural sciences
Fires
Mass Spectrometry
Wildfires
Soil
Spain
13. Climate action
Environmental Monitoring
0105 earth and related environmental sciences
DOI:
10.1016/j.jenvman.2018.07.069
Publication Date:
2018-08-02T06:56:18Z
AUTHORS (9)
ABSTRACT
Fire is one of the most important modulating factors of the environment and the forest inducing chemical and biological changes on the most reactive soil component, the soil organic matter (SOM). Assuming the complex composition of the SOM, we used an ultra-high resolution mass spectrometry analysis technique to assess the chemical composition and fire-induced alterations in soil particle size fractions (coarse and fine) from a sandy soil in a Mediterranean oak forest at Doñana National Park (Southwest Spain). Electrospray ionization-Fourier transform ion cyclotron resonance mass spectrometry (ESI-FTICRMS) showed that the coarse fraction of soils not affected by fires consisted mainly of polyphenolic compounds consistent with little-transformed SOM and fresh biomass, whereas the fine fraction was enriched in protein and lipid like homologues suggesting microbially reworked SOM. In fire-affected SOM, the coarse fraction contained a high proportion of aromatic compounds, consistent with inputs of charred litter or in situ chemical transformation of the SOM. Analysis of the fine fraction revealed two differentiated chemical families pointing to the existence of two carbon pools; a native microbial-derived moiety composed of lipids and polypeptide compounds, and a secondary, pyrogenic or thermally-altered moiety rich in aromatic compounds. This work represents the first application of ultra-high resolution mass spectrometry to study the chemical composition of SOM in different particle size fractions.
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