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• W2794470140 abstract "Denitrification is a major process contributing to the removal of nitrogen (N) from ecosystems, but its rate is difficult to quantify. The natural abundance of isotopes can be used to identify the occurrence of denitrification and has recently been used to quantify denitrification rates at the ecosystem level. However, the technique requires an understanding of the isotopic enrichment factor associated with denitrification, which few studies have investigated in forest soils. Here, soils collected from two tropical and two temperate forests in China were incubated under anaerobic or aerobic laboratory conditions for two weeks to determine the N and oxygen (O) isotope enrichment factors during denitrification. We found that at room temperature (20°C), NO3- was reduced at a rate of 0.17 to 0.35μgNg-1h-1, accompanied by the isotope fractionation of N (15ε) and O (18ε) of 31‰ to 65‰ (48.3±2.0‰ on average) and 11‰ to 39‰ (18.9±1.7‰ on average), respectively. The N isotope effects were, unexpectedly, much higher than reported in the literature for heterotrophic denitrification (typically ranging from 5‰ to 30‰) and in other environmental settings (e.g., groundwater, marine sediments and agricultural soils). In addition, the ratios of Δδ18O:Δδ15N ranged from 0.28 to 0.60 (0.38±0.02 on average), which were lower than the canonical ratios of 0.5 to 1 for denitrification reported in other terrestrial and freshwater systems. We suggest that the isotope effects of denitrification for soils may vary greatly among regions and soil types and that gaseous N losses may have been overestimated for terrestrial ecosystems in previous studies in which lower fractionation factors were applied." @default.
• W2794470140 created "2018-04-06" @default.
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• W2794470140 date "2018-08-01" @default.
• W2794470140 modified "2023-10-14" @default.
• W2794470140 title "High nitrogen isotope fractionation of nitrate during denitrification in four forest soils and its implications for denitrification rate estimates" @default.
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• W2794470140 doi "https://doi.org/10.1016/j.scitotenv.2018.03.261" @default.
• W2794470140 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/29758860" @default.
• W2794470140 hasPublicationYear "2018" @default.
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