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  • 1 Universitá degli Studi di Bologna Dipartimento di Scienze e Tecnologie Agroambientali Bologna Italy 40126 Bologna Italy 40126
  • | 2 Universitá degli Studi di Padova Dipartimento di Biotecnologie Agrarie Legnaro (Padova), Italy 16 35020 Legnaro (Padova), Italy 16 35020
  • | 3 Universitá degli Studi di Milano-Bicocca Dipartimento di Scienze dell'Ambiente e del Territorio Milano Italy 20126 Milano Italy 20126
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Humic acids (HAs) extracted from soils developed under two Norwegian spruce (Picea abies, (L.) Karst) subalpine forests of northern Italy were characterized using chemical, thermal (TG-DTA) and spectroscopic (DRIFT) analyses. The samples were taken from five sites which differed in orientation (northern and southern exposure) and vegetal cover at different old age: grassland, regeneration, immature and mature stands. In general, the thermal patterns of HAs were similar (three exothermic reactions appeared around at 300, 400 and 500C) in both sites in grasslands and regeneration while a considerable modification appeared in HA from stands of different age at northern and southern exposure site. DRIFT spectroscopy confirmed the differences observed through TG-DTA analysis. In particular the main structural changes were ascribed to modification of carbonyl group and of CH stretching in aliphatic components in each HAs from different sites.

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