Properties and composition of soil organic matter in forest and arable soils of schleswig holstein 1. comparison of morphology and results of wet chemistry cpmas carbon 13 nmr spectroscopy and pyrolysis field ionization mass spectrometry
Beyer, L.; Schulten, H.R.; Fruend, R.
Zeitschrift fuer Pflanzenernaehrung und Bodenkunde 155(4): 345-354
Properties and composition of 25 soil samples (0.8-51% Corg) were determined by morphology, wet chemistry, CPMAS-13C-NMR-spectroscopy and pyrolysis-field ionization mass spectrometry (Py-FIMS). The recovery rate of organic carbon was 102% (.+-.15%). The correlation between the litter compound/humic compound ratio and humification grade, estimated with morphological observations, was strong (r2=0.502***). A typical classification of horizons (L, O, H, Ah+M) with regard to organic compounds (wet chemistry and 13C=NMR) was not always significant. The pyrolysis-mass spectra confirmed and extended on the basis of molecular chemical structures the results of wet chemistry, especially with polysaccharides, nitrogen compounds, lignin, lipids and alkylaromatics (r2=0.818-0.937***). A correlation between the NMR-aliphatics, the human compounds isolated by wet chemistry, and the long-chain aliphatic carbon units in the pyrolysis-mass spectra was established.