Detailed investigation of organic matter components in extracts and drainage waters from a soil under long term cultivation

摘要: Abstract Aqueous solutions of increasing pH (7.0, 10.6 and 12.6) were used to extract exhaustively the organic matter (OM) from a pelo-stagnogley (heavy clay) soil in long term cultivation. OM yield was 1.7 times greater when extracts processed using an XAD-8 XAD-4 resin-in-tandem procedure than that International Humic Substances Society (IHSS). The substantial difference can be attributed amount retained by resin, which is lost IHSS process. Elemental, δ 13 C, 15 N, cation exchange capacity, neutral sugars, amino acids solid state CPMAS C NMR analyses indicated significant, but rational similarities differences between various fractions isolated. There strong evidence for material derived lignin all humic fulvic acid isolates. signals attenuated more transformed/oxidized isolated at lower pH. Novel enriched carbohydrate/peptide functionalities hydrophobic 12.6. Isolates XAD-4, microbial origin, sugars not acids, had minimal aromaticity. Components cultivated broadly similar those comparable grassland. compositions drainage water extracted higher carboxyl content. composition grassland continuously cropped are discussed terms their potential contribute carbon sequestration under management regimes.