Impact of grassland burning on soil organic matter as revealed by a synchrotron- and pyrolysis–mass spectrometry-based multi-methodological approach

Kiersch, Kristian; Kruse, Jens; Eckhardt, Kai‐Uwe; Fendt, Alois; Streibel, Thorsten; Zimmermann, Ralf; Broll, Gabriele; Leinweber, Peter

doi:10.1016/j.orggeochem.2011.12.002

Cited by 30 publications

(12 citation statements)

References 88 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Heterocyclic N‐compounds as well as Bn+Na, the latter found to be extremely increased in the till‐derived pinholes, may also result from the incomplete combustion of OM ( Kiersch et al, 2012b), which can originate for instance from burning of fossil fuels and/or vegetation fires. This suspicion of burning residues could be substantiated by Py‐FIMS data from till samples that contained intensive signals of C 15 to C 17 alkanes at m/z 212, 226, and 240, i.e.…”

Section: Discussionmentioning

confidence: 99%

Analyzing organic matter composition at intact biopore and crack surfaces by combining DRIFT spectroscopy and Pyrolysis‐Field Ionization Mass Spectrometry^#

Leue

Eckhardt

Ellerbrock

et al. 2015

J. Plant Nutr. Soil Sci.

Self Cite

View full text Add to dashboard Cite

In the clay‐illuvial horizons (Bt) of Luvisols, surfaces of biopores and aggregates can be enriched in clay and organic matter (OM), relative to the bulk of the soil matrix. The OM composition of these coatings determines their bio‐physico‐chemical properties and is relevant for transport and transformation processes but is largely unknown at the molecular scale. The objective of this study was to improve the interpretation of spectra from Fourier transform infrared spectroscopy in diffuse reflectance mode (DRIFT) by using thermograms and released ion intensities obtained with pyrolysis‐field ionization mass spectrometry (Py‐FIMS) for a more detailed analysis of the mm‐scale spatial distribution of OM components at intact structural surfaces. Samples were separated from earthworm burrow walls, crack coatings, uncoated cracks, root channels, and pinhole fillings of the Bt‐horizons of Luvisols. The information from Py‐FI mass spectra enabled the assignment of OM functional groups also from spectral regions of overlapping DRIFT signal intensities to specific OM compound classes. In particular, bands from C=O and C=C bonds in the infrared range of wave numbers between 1,641 and 1,605 cm−1 were related to heterocyclic N‐compounds, benzonitrile, and naphthalene. The OM at earthworm burrow walls was composed of chemically labile aliphatic C‐rich and rather stable lignin and alkylaromatic compounds whereas the OM of thick crack coatings and pinholes was dominated by heterocyclic N and nitriles and high‐molecular compounds, likely originating from combustion residues. In combination with Py‐FIMS, DRIFT applications to intact samples seem promising for generating a more detailed mm‐scale spatial distribution of OM‐related sorption and wettability properties of crack and biopore surfaces that may serve as preferential flow paths in structured soils.

show abstract

Section: Discussionmentioning

confidence: 99%

Analyzing organic matter composition at intact biopore and crack surfaces by combining DRIFT spectroscopy and Pyrolysis‐Field Ionization Mass Spectrometry^#

Leue

Eckhardt

Ellerbrock

et al. 2015

J. Plant Nutr. Soil Sci.

Self Cite

View full text Add to dashboard Cite

show abstract

“…The NCOMP proportions were larger than NCOMP data published for physically separated fine particle‐size fractions (Schulten and Leinweber, 1991; Schulten et al, 1992), suggesting that other N compounds like amides may have entered the fine fractions in particle‐size separation done for those studies and/or Bt‐specific pedogenetic processes favor the formation and stabilization of NCOMP. Furthermore, the high proportions of NCOMP and BN+NA presented here may also derive from combusted biomass (Kiersch et al, 2012a) and vertical transport of the reaction products (Leue et al, 2016).…”

Section: Discussionmentioning

confidence: 96%

“…The comparison between OM functional groups (DRIFT) and OM compound classes and compounds (Py‐FIMS) revealed that crack coatings and pinhole fillings of the Bt horizons were enriched in heterocyclic N and nitriles (NCOMP), benzonitrile (BN), and naphthalene (NA) (Leue et al, 2016). In particular BN and NA were representative of incomplete combustion of OM (Kiersch et al, 2012a), deriving from the burning of fossil fuels and/or vegetation fires, and were strongly related to DRIFT signals from C=O and C=C functional groups present in the infrared wave number (WN) range from 1641 to 1605 cm −1 . Strong relationships between NCOMP obtained by Py‐FIMS and DRIFT signals from O–H groups of clay minerals suggested stabilization mechanisms between the OM compounds and clay minerals in coatings and pinholes (Schulten and Leinweber, 1999, 2000), which may reflect long‐term humification processes.…”

mentioning

confidence: 99%

Spatial Distribution of Organic Matter Compounds at Intact Macropore Surfaces Predicted by DRIFT Spectroscopy

Leue

Eckhardt

Gerke

et al. 2017

Vadose Zone Journal

Self Cite

View full text Add to dashboard Cite

Core Ideas Clay coatings in Bt horizons are enriched in heterocyclic organic matter compounds. The enrichment results from preferential transport in the soil macropore network. These compounds probably originate from long‐term humification and biomass combustion. Py‐FIMS and DRIFT spectroscopy approach enables millimeter‐scale spatial characterization. The illuvial Bt horizon of Luvisols is characterized by coatings of clay and organic matter (OM) at the surfaces of cracks and biopore walls. The occurrence and distribution of OM compounds such as heterocyclic N compounds (NCOMP) and benzonitrile and naphthalene (BN+NA) in macropore coatings could have important effects on preferential transport processes in structured soil. The objective of this study was to estimate the millimeter‐scale distribution of NCOMP and BN+NA at intact surfaces of coated and uncoated cracks, pinholes, and burrow walls. The proportions of NCOMP and BN+NA in OM were determined by pyrolysis–field ionization mass spectrometry (Py‐FIMS) from disturbed material that was manually separated from the intact sample surfaces. Fourier‐transform infrared spectroscopy in diffuse reflectance mode (DRIFT) and partial least squares regression (PLSR) between DRIFT signals and Py‐FIMS data were used to generate millimeter‐scale maps of predicted NCOMP and BN+NA proportions at intact macropore surfaces. The NCOMP and BN+NA proportions were linearly related to C=O and C=C groups from OM and to O–H groups from clay minerals in DRIFT spectra. The millimeter‐scale distribution of NCOMP and BN+NA at intact macropore surfaces could be predicted in terms of relative differences among the macropore types. Increased NCOMP and BN+NA proportions corresponded to the spatial distribution of crack coatings and pinholes. The relative enrichment suggested that pyrogenic OM has been preferentially transported in cracks rather than in biopores and that it was stabilized by clay minerals and prevented from decomposition. The results indicated that preferential transport affects OM turnover processes in the subsoil.

show abstract

“…The experimental procedure has been described previously [23]. A brief description pertinent to the investigated samples studied in this publication is given in the following.…”

Section: Methodsmentioning

confidence: 99%

Effect of Temperature on the Molecular Weight Distribution in the Different Ranks of Coal during the On-Line Investigation of Coal Pyrolysis Gas Using Direct Photoionization Mass Spectroscopy

Mthembu¹,

Zimmermann²,

Streibel³

et al. 2015

IJCCE

Self Cite

View full text Add to dashboard Cite

Coal pyrolysis gas from different ranks of coal was monitored on real time basis using photoionization mass spectroscopy. The molecular weight distribution of different products as a function of temperature from various coal ranks studied was observed. It was noted that the release of different classes of compounds like phenols, alkenes, alkylated aromatics and aromatic skeletons was temperature dependent. For all the coal ranks at lower temperatures phenols were the main component, with alkenes and alkylated aromatics at slight higher temperatures and aromatic skeletons were released at the highest temperatures studied.

show abstract

Impact of grassland burning on soil organic matter as revealed by a synchrotron- and pyrolysis–mass spectrometry-based multi-methodological approach

Cited by 30 publications

References 88 publications

Analyzing organic matter composition at intact biopore and crack surfaces by combining DRIFT spectroscopy and Pyrolysis‐Field Ionization Mass Spectrometry^#

Analyzing organic matter composition at intact biopore and crack surfaces by combining DRIFT spectroscopy and Pyrolysis‐Field Ionization Mass Spectrometry^#

Spatial Distribution of Organic Matter Compounds at Intact Macropore Surfaces Predicted by DRIFT Spectroscopy

Effect of Temperature on the Molecular Weight Distribution in the Different Ranks of Coal during the On-Line Investigation of Coal Pyrolysis Gas Using Direct Photoionization Mass Spectroscopy

Contact Info

Product

Resources

About

Impact of grassland burning on soil organic matter as revealed by a synchrotron- and pyrolysis–mass spectrometry-based multi-methodological approach

Cited by 30 publications

References 88 publications

Analyzing organic matter composition at intact biopore and crack surfaces by combining DRIFT spectroscopy and Pyrolysis‐Field Ionization Mass Spectrometry#

Analyzing organic matter composition at intact biopore and crack surfaces by combining DRIFT spectroscopy and Pyrolysis‐Field Ionization Mass Spectrometry#

Spatial Distribution of Organic Matter Compounds at Intact Macropore Surfaces Predicted by DRIFT Spectroscopy

Effect of Temperature on the Molecular Weight Distribution in the Different Ranks of Coal during the On-Line Investigation of Coal Pyrolysis Gas Using Direct Photoionization Mass Spectroscopy

Contact Info

Product

Resources

About

Analyzing organic matter composition at intact biopore and crack surfaces by combining DRIFT spectroscopy and Pyrolysis‐Field Ionization Mass Spectrometry^#

Analyzing organic matter composition at intact biopore and crack surfaces by combining DRIFT spectroscopy and Pyrolysis‐Field Ionization Mass Spectrometry^#