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In order to investigate the interactions between the litter composition, nuclear magnetic resonance (NMR) spectra of the humic fractions, delta (13)C values and different biological activities of the humic constituents of the Ah horizons, two undisturbed forest soils, located in a unique climatic area under different vegetal covers (Pinus mugo and Pinus sylvestris) were studied.

The Pinus mugo litter exhibited a high content of lignin, protein and ash while the Pinus sylvestris one was endowed with a great quantity of cellulose, hemicellulose and fats, waxes and oils. Chemical changes in both the Ah horizons, involved the increase of aromatic and the carboxylic components belonging to the low molecular humic functions and the decrease of the aliphatic and the carbohydratic regions. The high molecular humic fractions presented an opposite trend.

Invertase, peroxidase and esterase activities, are influenced differently by humic substances in wheat roots. Wheat roots treated with humic materials derived from the Pinus sylvestris litter, revealed the presence of a band in the esterase pattern, which was attributable to indoleacetic acids. ds.

Additional information

Authors: NARDI S, Università di Padova, Dipartimento di Biotecnologie Agrarie (IT);PIZZIGHELLO D, Università di Padova, Dipartimento di Biotecnologie Agrarie (IT);RENIERO F, JRC Ispra (IT)
Bibliographic Reference: Article: Biological Fertility of Soils
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