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• W2019091705 abstract "We report measurements of the 15 N and 18 O signature of N 2 O emitted from tropical rain forest soils at the La Selva Biological station in Costa Rica and in the Fazenda Vitoria in the State of Pará, Brazil. The δ 15 N values ranged from −34 to 2‰ with respect to atmospheric N 2 , while δ 18 O values had a smaller range, from −4 to 18‰ with respect to atmospheric O 2 . We attribute these large variations to differences in microbial production, consumption, and transport of N 2 O. In general the δ 15 N of N 2 O emissions from an Oxisol soil in Brazil were consistently enriched by ∼20‰ in 15 N compared to those from Ultisol and Inceptisol soils in Costa Rica. Denitrification is the most likely source of N 2 O in both locations during the rainy season, and the 15 N of nitrate was similar in both locations. We attribute the overall variability in emitted 15 N to differences in the ratio of N 2 O:N 2 escaping from the soil to the atmosphere, with a larger fraction of the N 2 O reduced to N 2 at the Brazilian sites. We found light δ 15 N‐N 2 O values associated with high N 2 O emissions in a fertilized agricultural site in Costa Rica and in a “hot spot” of high emissions in the forest site in Brazil. This result suggests that the increase of substrate availability might increase the fractionation associated with N 2 O production. Overall, the Brazilian Oxisol soils had the most enriched δ 15 N‐N 2 O emissions yet measured from soils. If these are more representative of tropical soil emissions than the Costa Rica emissions, then the globally averaged δ 15 N‐N 2 O tropical rain forest soil source is more enriched than previously estimated. The large variations in isotopic signature for N 2 O emissions demonstrate the potential utility of stable isotopes as tools for understanding the processes of N 2 O production and consumption in soils." @default.
• W2019091705 created "2016-06-24" @default.
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• W2019091705 date "2000-06-01" @default.
• W2019091705 modified "2023-10-17" @default.
• W2019091705 title "Isotopic variability of N₂O emissions from tropical forest soils" @default.
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• W2019091705 doi "https://doi.org/10.1029/1999gb001181" @default.
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