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Soil organic matter characteristics in extremely water-repellent soils developed under forests of Pinus pinaster and Eucalyptus globulus in Galicia (Northwestern Spain) were analyzed with special emphasis paid in lipid and humic acid fractions. A total of sixteen soils were studied including Leptic Regosols and Leptic Umbrisols developed on granites and schists, and showing extreme water repellency:...
This study examined the chemical and structural properties of humic substances and microbiological activity in order to verify differences in carbon dynamics along soil profiles in two Vertisols (Typic Haploxerert and Xeric Epiaquert) and two Alfisols (Mollic Haploxeralf and Ultic Haploxeralf) developed under Mediterranean climate in Italy. Humification parameters, thermal methods, including differential...
The potential of infrared spectroscopy to establish differences in terms of the environmental factors on the humification processes has been assessed on Mediterranean forest soils from Central Spain developed under sclerophyllic and gymnosperm vegetation. Humic acids were isolated from 21 soil samples differing in terms of vegetation (pine, holm oak, oak), geological substrate (granite, limestone),...
Japanese volcanic ash soils have very thick and dark-colored A horizons with large amounts of black humic acids which are characterized by their extremely high aromatic structure and stabilities such as black carbon. Nevertheless, the disappearance of the melanic epipedon with a decreasing aromatic C and increasing alkyl C proportion of humic acids was observed in ecological succession for only over...
Humic substances constitute the most abundant organic fraction in the biosphere, which have extensively been studied for more than 200years; however, much remains unknown regarding their structure and properties. In the present study, 12 different samples of humic acids (HA) were extracted from a wide diversity of organic rich environments, including soil from different forests and plantations, and...
The use of appropriate amendments derived from two phase olive mill wastes (TPOMW) can represent a suitable option to maintain and restore C levels in agricultural soils under Mediterranean climates. We evaluated soil organic matter stabilisation pathways among different humic pools in a Calcaric Cambisol amended with 2% (40Mgha −1 ) of TPOMW composting mixtures of different composition and...
Diffusion experiments in humic hydrogels provide valuable findings on reactivity of humic matrices. This article concentrates on the study of interactions between humic acids and copper(II) ions in diffusion experiments. The diffusion experiments were supplemented with selective extraction of the diffused copper(II) ions. For this purpose, the leaching agents with increasing affinity towards copper(II)...
The key to understanding cation binding to humic acids rests in the ability to quantify the acidic groups in the humic acids. Potentiometric titration has been effectively used in these quantitation and the results are very good. Also, potentiometric titration offers access to other behavioral information that may not be accessible when other methods (Baryta and acetate method) are used for the acidity...
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