In the present study, total organic carbon (TOC) analysis and spectroscopic characterization (IRMS, DRIFT and SERS) are applied to investigate the molecular changes in humic acids (HA) extracted from soil samples amended for over 30 years with cattle manure (CM), cow slurries (CS) and crop residues (CR). All samples are compared to the unamended (T) sample. A variation in soil TOC percentage occurs in all samples, but a significant (P<0.05) accumulation of C is observed only in CM. The TOC  13C values appeared progressively less negative in all samples with respect to T. The DRIFT and SERS analyses of HA revealed a change in oxygenate groups (such as COO- and OH) in the amendment with CS and CR. These results suggest how amendment might affect both C accumulation and the HA structure.
Characterization of soil carbon in a long-term amendament trials / O. FRANCIOSO; S. SANCHEZ-CORTES; G. CORRADO; P. GIOACCHINI ; C. CIAVATTA. - In: SPECTROSCOPY LETTERS. - ISSN 0038-7010. - STAMPA. - 38:(2005), pp. 291-299. [10.1081/SL-200058704]
Characterization of soil carbon in a long-term amendament trials
FRANCIOSO, ORNELLA;GIOACCHINI, PAOLA;CIAVATTA, CLAUDIO
2005
Abstract
In the present study, total organic carbon (TOC) analysis and spectroscopic characterization (IRMS, DRIFT and SERS) are applied to investigate the molecular changes in humic acids (HA) extracted from soil samples amended for over 30 years with cattle manure (CM), cow slurries (CS) and crop residues (CR). All samples are compared to the unamended (T) sample. A variation in soil TOC percentage occurs in all samples, but a significant (P<0.05) accumulation of C is observed only in CM. The TOC 13C values appeared progressively less negative in all samples with respect to T. The DRIFT and SERS analyses of HA revealed a change in oxygenate groups (such as COO- and OH) in the amendment with CS and CR. These results suggest how amendment might affect both C accumulation and the HA structure.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
