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Tillage Management Alters Surface Soil Organic Matter Composition: A Pyrolysis Mass Spectroscopy Study

^a Dep. of Soil Management and Soil Care, Ghent Univ., Coupure Links 653, 9000 Gent, Belgium
^b Institute for Land Use, Univ. of Rostock, Justus von Liebig Weg 6, 18059 Rostock, Germany
^c Dep. of Soil Management and Soil Care, Ghent Univ., Coupure Links 653, 9000 Gent, Belgium

View larger version (19K): [in this window] [in a new window]   Fig. 1. Depth distribution of the average soil organic C (SOC) and N stocks in the reduced tillage (RT) and the conventional tillage (CT) fields at Villers-le-Bouillet, Belgium; error bars represent corresponding standard deviations.

View larger version (31K): [in this window] [in a new window]   Fig. 2. Relative distribution of the whole-soil organic C (OC) and N across coarse and fine free particulate organic matter (fPOM, >53 µm), intramicroaggregate particulate organic matter (iPOM, 53–250 µm) and silt + clay associated (<53 µm) soil organic matter fractions (0–10-cm depth layer) of the reduced tillage (RT) and conventional tillage (CT) fields at Villers-le-Bouillet, Belgium. Columns represent average values of triplicates; error bars represent corresponding standard deviations.

View larger version (46K): [in this window] [in a new window]   Fig. 3. Thermograms of the total ion intensities (TII) and summed averaged pyrolysis–field ionization mass spectra of the (a, b) free particulate organic matter (fPOM) and (c, d) intramicroaggregate particulate organic matter (iPOM) fractions of the 0- to 10-cm depth layer of the reduced tillage (RT) and the conventional tillage (CT) fields at Villers-le-Bouillet, Belgium.

View larger version (46K): [in this window] [in a new window]   Fig. 4. Thermograms of the total ion intensities (TII) and summed averaged pyrolysis–field ionization mass spectra of the (a, b) silt and (c, d) clay fractions of the 0- to 10-cm depth layer of the reduced tillage (RT) and the conventional tillage (CT) fields at Villers-le-Bouillet, Belgium.

View larger version (44K): [in this window] [in a new window]   Fig. 5. Difference thermograms (reduced tillage [RT] minus conventional tillage [CT]) of the total ion intensities (TII) for the volatilization of selected pyrolysis–field ionization mass spectroscopy compound classes (CHYDR: carbohydrates with pentose and hexose subunits; PHLM: phenols and lignin monomers; LDIM: lignin dimers; LIPID: lipids, alkanes, alkenes, fatty acids, and n-alkyl esters; PEPTI: peptides) of the silt size fraction. Positive values indicate that relatively more molecules from the respective compound class were volatilized from the RT soil than from the CT soil.