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Selective logging is an extensive land use in the Brazilian Amazon region. The soil–atmosphere fluxes of nitrous oxide (N ₂ O), nitric oxide (NO), methane (CH ₄ ), and carbon dioxide (CO ₂ ) are studied on two soil types (clay Oxisol and sandy loam Ultisol) over two years (2000–01) in both undisturbed forest and forest recently logged using reduced impact forest management in the Tapajos National Forest, near Santarem, Para, Brazil. In undisturbed forest, annual soil–atmosphere fluxes of N ₂ O (mean ± standard error) were 7.9 ± 0.7 and 7.0 ± 0.6 ng N cm ⁻² h ⁻¹ for the Oxisol and 1.7 ± 0.1 and 1.6 ± 0.3 ng N cm ⁻² h ⁻¹ for the Ultisol for 2000 and 2001, respectively. The annual fluxes of NO from undisturbed forest soil in 2001 were 9.0 ± 2.8 ng N cm ⁻² h ⁻¹ for the …