Details
| Original language | English |
|---|---|
| Article number | 105095 |
| Journal | Organic geochemistry |
| Volume | 210 |
| Early online date | 25 Nov 2025 |
| Publication status | Published - Dec 2025 |
Abstract
Dissolved organic matter (DOM) is the most active and labile organic fraction in soils, participating in numerous biogeochemical processes. Comprehensive understanding of DOM composition at the molecular level remains a challenge due to limited or contrasting analytical data based on a single technique or limited analysis, which may be addressed using multiple complementary techniques. In this study, we utilized five prevalent and novel spectroscopic and spectrometric techniques, i.e., XPS, FTIR, NEXAFS, NMR, and FT-ICR-MS, coupled with multivariate analysis to decipher the complexity of DOM. We extracted DOM from four decomposed plant residues − pine, eucalyptus, pasture, and wheat. The organic carbon concentration in the DOM samples followed the order: pine > eucalyptus > wheat > pasture. Eucalyptus and pasture DOM exhibited similarities in aromatic compounds but differed in saturation and O-containing groups. Pine DOM was enriched in aromatic and carboxylic compounds, whereas wheat DOM contained more lipid and aliphatic compounds. The differences in the abundance of functional groups and compound families were attributed to the influence of both the original plant residues and microbial degradation. Chemical convergence of the four DOM samples, reflected by their broadly similar spectral composition was possibly due to similar biodegradation processes but in different stages. Multivariate analysis of multiple spectroscopic data comprehensively captured the DOM composition.
Keywords
- Dissolved organic matter, FT-ICR-MS, FTIR, Multivariate analysis, NEXAFS, NMR, Plant residues, XPS
ASJC Scopus subject areas
- Earth and Planetary Sciences(all)
- Geochemistry and Petrology
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In: Organic geochemistry, Vol. 210, 105095, 12.2025.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Insights into the complex nature of dissolved organic matter from plant residues using multiple spectroscopic techniques
AU - Yang, Zongtang
AU - Mohanty, Biswaranjan
AU - Dijkstra, Feike A.
AU - Guggenberger, Georg
AU - Singh, Balwant
N1 - Publisher Copyright: © 2025 The Author(s).
PY - 2025/12
Y1 - 2025/12
N2 - Dissolved organic matter (DOM) is the most active and labile organic fraction in soils, participating in numerous biogeochemical processes. Comprehensive understanding of DOM composition at the molecular level remains a challenge due to limited or contrasting analytical data based on a single technique or limited analysis, which may be addressed using multiple complementary techniques. In this study, we utilized five prevalent and novel spectroscopic and spectrometric techniques, i.e., XPS, FTIR, NEXAFS, NMR, and FT-ICR-MS, coupled with multivariate analysis to decipher the complexity of DOM. We extracted DOM from four decomposed plant residues − pine, eucalyptus, pasture, and wheat. The organic carbon concentration in the DOM samples followed the order: pine > eucalyptus > wheat > pasture. Eucalyptus and pasture DOM exhibited similarities in aromatic compounds but differed in saturation and O-containing groups. Pine DOM was enriched in aromatic and carboxylic compounds, whereas wheat DOM contained more lipid and aliphatic compounds. The differences in the abundance of functional groups and compound families were attributed to the influence of both the original plant residues and microbial degradation. Chemical convergence of the four DOM samples, reflected by their broadly similar spectral composition was possibly due to similar biodegradation processes but in different stages. Multivariate analysis of multiple spectroscopic data comprehensively captured the DOM composition.
AB - Dissolved organic matter (DOM) is the most active and labile organic fraction in soils, participating in numerous biogeochemical processes. Comprehensive understanding of DOM composition at the molecular level remains a challenge due to limited or contrasting analytical data based on a single technique or limited analysis, which may be addressed using multiple complementary techniques. In this study, we utilized five prevalent and novel spectroscopic and spectrometric techniques, i.e., XPS, FTIR, NEXAFS, NMR, and FT-ICR-MS, coupled with multivariate analysis to decipher the complexity of DOM. We extracted DOM from four decomposed plant residues − pine, eucalyptus, pasture, and wheat. The organic carbon concentration in the DOM samples followed the order: pine > eucalyptus > wheat > pasture. Eucalyptus and pasture DOM exhibited similarities in aromatic compounds but differed in saturation and O-containing groups. Pine DOM was enriched in aromatic and carboxylic compounds, whereas wheat DOM contained more lipid and aliphatic compounds. The differences in the abundance of functional groups and compound families were attributed to the influence of both the original plant residues and microbial degradation. Chemical convergence of the four DOM samples, reflected by their broadly similar spectral composition was possibly due to similar biodegradation processes but in different stages. Multivariate analysis of multiple spectroscopic data comprehensively captured the DOM composition.
KW - Dissolved organic matter
KW - FT-ICR-MS
KW - FTIR
KW - Multivariate analysis
KW - NEXAFS
KW - NMR
KW - Plant residues
KW - XPS
UR - http://www.scopus.com/inward/record.url?scp=105023586093&partnerID=8YFLogxK
U2 - 10.1016/j.orggeochem.2025.105095
DO - 10.1016/j.orggeochem.2025.105095
M3 - Article
AN - SCOPUS:105023586093
VL - 210
JO - Organic geochemistry
JF - Organic geochemistry
SN - 0146-6380
M1 - 105095
ER -