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- W2997516281 abstract "Abstract Freeze-thaw cycles (FTCs) and increasing nitrogen (N) availability may affect soil carbon (C) and N turnover and thus stimulate greenhouse gas (GHG) emissions in cold regions. However, the combined effects of FTCs and increased N availability on GHG fluxes remain unexplored, especially in high-altitude alpine meadows. We conducted an incubation study to investigate the effects of different forms and levels of N additions on soil trace gas fluxes during three FTCs in an alpine meadow on the Qinghai-Tibetan Plateau. Our results showed that the N2O and CO2 emissions as well as CH4 uptake substantially increased during FTCs. N additions generally enhanced the freeze–thaw-related soil N2O emissions but inhibited soil respiration and CH4 oxidation. NO3–-N additions induced significantly higher cumulative N2O emissions during FTCs than NH4+-N additions. The soil respiration rates were significantly reduced with increasing levels of N additions and were positively correlated with the soil DOC and MBC contents. Soil CH4 uptake was substantially inhibited by increasing levels of NH4+-N additions, but was significantly reduced only by high levels of NO3–-N additions. Our results indicate that N addition plays an important role in affecting soil GHG fluxes during FTCs. The effects of different forms and levels of N additions on soil GHG fluxes should be considered in future estimations of GHG budget in alpine meadows under a changing climate." @default.
- W2997516281 created "2020-01-10" @default.
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- W2997516281 date "2020-04-01" @default.
- W2997516281 modified "2023-09-24" @default.
- W2997516281 title "Nitrogen additions increase N2O emissions but reduce soil respiration and CH4 uptake during freeze–thaw cycles in an alpine meadow" @default.
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- W2997516281 doi "https://doi.org/10.1016/j.geoderma.2019.114157" @default.
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