Abstract
In southern Portugal, two areas reforested with Eucalyptus globulus and a reference area under native vegetation dominated by Quercus suber , were selected. The distribution of humus carbon and nitrogen in these soils was compared by physical and chemical fractionation. All size fractions of soils under E. globulus had higher C/N ratios than the corresponding fractions of the soil under Q. suber. The studied humic acids had similar elemental composition, except their nitrogen content that was lower in those from soils under E. globulus . The differences in nitrogen content and aliphaticity were more pronounced when the humin fractions were considered.
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