Molecular composition and chemometric differentiation and classification of soil organic matter in Podzol B-horizons

API ZYM assay to evaluate enzyme fingerprinting and microbial functional diversity in relation to soil processes

“…Therefore, a higher ratio indicates a lower interaction of extracellular enzymes and microbial cells with the soil solid matrix. A similar trend was observed in a Spodosol for cellulase activity (Marinari et al 2013), where the rates decreased in the eluvial E horizon and increased in the B horizon, and this trend was suggested to be due to pedogenic processes such as eluviation/illuviation of lignocellulosic material (Guggenberger et al 1994;Wilcken et al 1997). Lignocellulosic material leaching from the surface horizons can be retained in deep soil layers by stabilisation mechanisms implying clay and metals such as Fe/Al as binding agents in soils from sandstone-derived acidic materials.…”

Criterious preparation and characterization of earthworm-composts in view of animal waste recycling. Part I. Correlation between chemical, thermal and FTIR spectroscopic analyses of four humic acids from earthworm-composted animal manure

“…Very few thermoanalytical data for VC and their HA have been reported, due probably to the low resolution of the curves 13 . However, extensive studies by pyrolysis-mass spectrometry of soil HA have been reported 15,16,17,18 .…”

“…Humic substances seem to be constituted by alkylaromatic cores which can bind carbohydrates, proteins, lipids and inorganic substances 18,19,20 . The bimodal thermal profiles of the DSC curves are indicative of two types of bonds for the stabilization of organic matter in humic substances: intramolecular bonds between the components of the organic matter (peak at ca.…”

“…300 o C), and intermolecular organo-mineral linkages (peak at ca. 500 o C), the latter yielding more thermostable materials than the former 18,20 .…”

Analytical Pyrolysis and Soft‐Ionization Mass Spectrometry

“…Gonz á lez -P é rez et al (2007) found large yields of aliphatic (both alkyland carbohydrate -derived) pyrolysis compounds in soils with andic horizons by double -shot Py -GC/MS. Podzol Bh horizons were formed by leaching of dissolved and colloidal organic matter that originates from undecomposed litter layers, often from heathland vegetation, and the precipitation of these organics in subsoils (Wilcken et al, 1997 ). This SOM was characterized by the highest proportions of lipids and sterols among all mineral soils.…”