Abstract
The intimate association of organic and mineral soil constituents to form organic-mineral complexes is one of the most important soil characteristics as it affects almost all physical, chemical and biological, soil properties. Therefore, the composition and functions of soil organic matter (SOM) in organic-mineral soil particles are subject to intensive research. According to pre-treatment and isolation techniques we can distinguish investigations of (1) particle-size, (2) density and (3) aggregate fractions. Methodical approaches applied were (1) wet-chemical analyses (contents of carbohydrates, lignin decomposition products, N-containing compounds, lipids), (2) noninvasive spectroscopy (solid-state ~3C-NMR), and (3) combinations of pyrolysis with gas-chromatography/ mass spectrometry (GC/MS) and field-ionization mass spectrometry (FI-MS). This contribution gives the state of knowledge about organic matter composition in soil fractions of different size, density and spatial arrangement (aggregates).
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