Assessment of Soil Organic Matter Molecular Characteristics Related to Hydrophysical Properties in Semiarid Soils (Central Spain)

2013 ◽  
Vol 27 (4) ◽  
pp. 303-326 ◽  
Author(s):  
A. M. Álvarez ◽  
P. Carral ◽  
Z. Hernández ◽  
G. Almendros
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Molecular Characteristics ◽  
Central Spain ◽  
Semiarid Soils

scholarly journals Molecular characteristics of permanganate- and dichromate-oxidation-resistant soil organic matter from a black-C-rich colluvial soil

Soil Research ◽  
2014 ◽  
Vol 52 (2) ◽  
pp. 164 ◽  
Author(s):  
Manuel Suárez-Abelenda ◽  
Joeri Kaal ◽  
Marta Camps-Arbestain ◽  
Heike Knicker ◽  
Felipe Macías
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
13C Nmr ◽  
Magic Angle Spinning ◽  
Molecular Characteristics ◽  
Magic Angle ◽  
Residual Soil ◽  
Pyrolysis Gas ◽  
North West ◽  
Colluvial Soil

Samples from a colluvial soil rich in pyrogenic material (black C, BC) in north-west Spain were subjected to K2Cr2O7 and KMnO4 oxidation and the residual soil organic matter (SOM) was NaOH-extracted and analysed using analytical pyrolysis–gas chromatography–mass spectroscopy (Py-GC/MS) and solid-state 13C cross-polarisation magic angle spinning–nuclear magnetic resonance (13C CP MAS-NMR) in order to study the susceptibility of different SOM fractions (fresh, degraded/microbial, BC and aliphatic) towards these oxidising agents. Untreated samples that were NaOH-extracted were also analysed. The Py-GC/MS and 13C NMR indicated that KMnO4 promotes the oxidation of carbohydrate products, mostly from degraded/microbial SOM and lignocellulose, causing a relative enrichment of aliphatic and aromatic structures. Residual SOM after K2Cr2O7 oxidation contained BC, N-containing BC and aliphatic structures. This was corroborated by a relatively intense resonance of aromatic C and some signal of alkyl C in 13C NMR spectra. These results confirm that dichromate oxidation residues contain a non-pyrogenic fraction mainly consisting of aliphatic structures.

Soil Organic Matter

1962 ◽  
Vol 54 (5) ◽  
pp. 470-470
Author(s):  
T. M. McCalla
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter
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