Abstract

RODRIGUES, Renato de Aragão Ribeiro  and  MELLO, William Zamboni de. Nitrous oxide fluxes in Montane Tropical Rainforest Soil in Serra dos Órgãos, RJ. Quím. Nova [online]. 2012, vol.35, n.8, pp. 1549-1553. ISSN 0100-4042.  http://dx.doi.org/10.1590/S0100-40422012000800011.

Soil fluxes of N₂O were determined over one year in montane tropical rainforest of southeastern Brazil with average annual rainfall of 2.8 m. Annual mean (± standard deviation) and median N₂O fluxes were 3.0 ± 1.4 and 2.7 µg N m^-2 h^-1, respectively, is 5-10 times lower than mean values reported in literature for tropical rainforest soils in the Amazon basin. N₂O fluxes varied spatially and seasonally, were about twice as high during summer as in winter, and significantly influenced by both monthly precipitation and soil temperature.

Keywords : soil gas fluxes; nitrogen biogeochemical cycle; ozone-depleting substances.