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USE OF THERMOGRAVIMETRY–DIFFERENTIAL SCANNING CALORIMETRY TO CHARACTERIZE MODELABLE SOIL ORGANIC MATTER FRACTIONS

Elisa Lopez-Capela,*, Saran P. Sohib, John L. Gauntb and David A. C. Manninga

a School of Civil Engineering and Geosciences, Univ. of Newcastle, Newcastle on Tyne, NE1 7RU UK
b Agriculture and Environment Division, Rothamsted Research, Harpenden, Herts, AL5 2JQ, UK










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  		Fig. 1. Thermogravimetry–differential scanning calorimetry (TG–DSC) thermograms for (a) cellulose (b) lignin (c) cellulose and lignin mixed (50:50 w/w); free light fraction soil organic matter (FLF-SOM) and intra-aggregate light fraction soil organic matter (IALF–SOM) from (d) arable (e) grassland and (f) bare fallow soils; and (g) DSC and (h) TG traces for arable, grassland, and bare fallow organomineral–soil organic matter (M-SOM) and whole soil (WS) samples.

 


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  		Fig. 2. Correlation of NMR and thermogravimetry (TG) results for free light fraction–soil organic matter (FLF–SOM) and intra-aggregate light fraction–soil organic matter (IALF–SOM) samples under all three land uses (a) Exo1 and O-alkyl C (b) Exo2 and aromatic C, and (c) Exo1 and O-alkyl/alkyl ratio.

 




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