期刊
JOURNAL OF ENVIRONMENTAL MANAGEMENT
卷 225, 期 -, 页码 139-147出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jenvman.2018.07.069
关键词
Charred biomass; ESI-FT-ICR/MS; Mediterranean soils particle size fractions; Pyrogenic organic matter; van Krevelen diagram; Wildfire
资金
- MINECO project INTERCARBON [CGL2016-78937-R]
- Department of Chemistry and Biochemistry of the Old Dominion University (Norfolk, VA, USA)
- project Soil Carbon Turnover and Fluxes in Mediterranean Natural and Managed Ecosystems [2017/19]
- FPI [BES-2013-062573]
- MINECO
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 Doi ana 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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