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Impacts of Soil Management Practices on the Organic Matter Structure ‐ Investigations by CPMAS 13 CNMR‐Spectroscopy
Author(s) -
Fründ R.,
Haider K.,
Lödemann H.D.
Publication year - 1994
Publication title -
zeitschrift für pflanzenernährung und bodenkunde
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.644
H-Index - 87
eISSN - 1522-2624
pISSN - 0044-3263
DOI - 10.1002/jpln.19941570106
Subject(s) - humus , chemistry , soil water , carbon fibers , spectroscopy , soil organic matter , fractionation , organic matter , carbon 13 nmr , soil test , characterization (materials science) , nmr spectra database , soil carbon , nuclear magnetic resonance spectroscopy , total organic carbon , environmental chemistry , analytical chemistry (journal) , spectral line , organic chemistry , soil science , materials science , environmental science , physics , quantum mechanics , composite number , composite material , astronomy , nanotechnology
Humus properties of 42 soil samples or humic extracts of Ap horizons of Cambisols and Luvisols, from different field plots, kept for a long time under continuous management conditions, have been studied by quantitative CPMAS 13 C NMR‐spectroscopy. The shift range of the spectra were divided into 8 regions, with carbon absorptions from 0–45 (aliphatics), 45–60 (OCH 3 ), 60–80 (COCN), 80–110 (anomeric carbons), 110–140 (aryl—C), 140–160 (O‐aryl‐C) and 160–210 (COOHCO) ppm, respectively. Although soil samples and humic extracts were obtained from plots from different locations and sometimes widely differing organic carbon contents, variances in the relative absorptions of the selected ranges were rather small. Several absorptions were significantly correlated among each other or with soil carbon and microbial biomass contents. These correlations were discussed with the applied management and with other results about humus formation and properties. CPMAS 13 C NMR‐spectroscopy allows a reliable and comprehensive characterization of soil organic matter from soils without previous fractionation.