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We hypothesised that N inputs to the soil from residues of adult trees of  Acacia mangium  Willd. increase soil nitrate availability and consequently induce higher nitrous oxide (N 2 O) fluxes, irrespective of being in pure or mixed stands with  Eucalyptus . A randomised block-design experiment was set up on Haplic Planosol in Brazil to study the impact of monospecific stands of  Eucalyptus urograndis  ( Eucalyptus urophylla  S. T. Blake ×  Eucalyptus grandis  W. Hill ex Maiden) fertilised with 120 kg N ha −1  (E100+N) and  A. mangium  (A100), along with the mixture of both species (E50A50) on soil N mineralisation and its relationship with soil N 2 O emissions.  In situ  monitoring of N mineralisation, N 2 O emissions and the soil N stocks was carried out between five- and six-year-old plantations. The total soil net mineralisation of N that was accumulated in plantations A100 and E50A50 was on average 3.5- and 2.5-times greater than in the E100+N plantation. The NO 3−  produced throughout the year by the plantations was proportional to the total net mineralisation, according to the following order of production scale: A100 &gt; E50A50 &gt; E100+N. Furthermore, N 2 O emissions in the plantations that included  A. mangium  (A100 and E50A50) were significantly higher in some periods of the year, as compared with in the E100+N plantation. This pattern caused a more pronounced curve of accumulated N 2 O emissions under  A. mangium  plantations (pure and mixed) as compared with the monospecific  Eucalyptus  plantation (E100+N). However, the magnitude of N accumulation emissions suggests that mixed plantations could increase the nutritional status of sandy soils.

Nitrogen mineralisation and N 2 O emissions in pure and mixed-species plantations of Eucalyptus urograndis and Acacia mangium