The molecular composition of dissolved organic matter in forest soils as a function of pH and temperature

PloS One
Vanessa-Nina RothGerd Gleixner

Abstract

We examined the molecular composition of forest soil water during three different seasons at three different sites, using electrospray ionization Fourier transform ion cyclotron resonance mass spectrometry (ESI-FT-ICR-MS). We examined oxic soils and tested the hypothesis that pH and season correlate with the molecular composition of dissolved organic matter (DOM). We used molecular formulae and their relative intensity from ESI-FT-ICR-MS for statistical analysis. Applying unconstrained and constrained ordination methods, we observed that pH, dissolved organic carbon (DOC) concentration and season were the main factors correlating with DOM molecular composition. This result is consistent with a previous study where pH was a main driver of the molecular differences between DOM from oxic rivers and anoxic bog systems in the Yenisei River catchment. At a higher pH, the molecular formulae had a lower degree of unsaturation and oxygenation, lower molecular size and a higher abundance of nitrogen-containing compounds. These characteristics suggest a higher abundance of tannin connected to lower pH that possibly inhibited biological decomposition. Higher biological activity at a higher pH might also be related to the higher abundance o...Continue Reading

References

Jul 17, 1999·Rapid Communications in Mass Spectrometry : RCM·G GleixnerJ Balesdent
Feb 24, 2001·Nature·C FreemanH Kang
Sep 28, 2004·Oecologia·Waltraud X SchulzeErnst-Detlef Schulze
Oct 8, 2011·Nature·Michael W I SchmidtSusan E Trumbore
Mar 15, 2012·Environmental Science & Technology·Thomas RiedelThorsten Dittmar
Sep 12, 2012·Analytical and Bioanalytical Chemistry·Antonio Nebbioso, Alessandro Piccolo
Jul 23, 2013·FEMS Microbiology Ecology·Ashish Malik, Gerd Gleixner

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Citations

Nov 29, 2016·Nature Communications·Cynthia M KallenbachA Stuart Grandy
Feb 22, 2017·The Science of the Total Environment·Peter HerzsprungKurt Friese
Mar 4, 2019·Environmental Geochemistry and Health·Zahra Derakhshan-NejadGiehyeon Lee
Dec 21, 2018·The Science of the Total Environment·Chenxin ZhouMalak M Tfaily
Jan 5, 2018·Environmental Science & Technology·Xiao-Ming LiYong-Guan Zhu

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Methods Mentioned

BETA
PCA
environmental stress

Software Mentioned

SPSS
Matlab
Canoco

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