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- W2976892420 abstract "In cool temperate regions, large emissions of nitrous oxide (N 2 O), an important greenhouse and ozone-depleting gas, have been observed during freeze–thaw (FT) cycles. However, it is unclear how freezing and thawing rates, freezing intensity, and freezing duration influence N 2 O emissions. We used a laboratory incubation to measure N 2 O emissions from two soils (sandy loam, silty clay) undergoing a single FT cycle of various freezing and thawing rates [rapid (0.5 °C h −1 ) vs. slow (0.017 °C h −1 )], freezing intensity (−1 vs. −3 °C), and freezing duration (24 vs. 48 freezing degree-days). In general, soil carbon dioxide fluxes during freezing were highest when soils were frozen slowly at −1 °C, whereas fluxes after thawing were highest from the soils frozen and thawed rapidly at −3 °C. Soil N 2 O emissions during both the freezing and thawing periods were greatest in the soils exposed to rapid freezing to −3 °C, intermediate under rapid freezing to −1 °C and slow freezing to −3 °C, and smallest under slow freezing to −1 °C and the control treatment (constant +1 °C). The similar N 2 O emissions between the unfrozen control and the slowly frozen −1 °C treatment was unexpected as previous field studies with similar freezing rates and temperatures still experienced high N 2 O emissions during thaw. This suggests that the physical disruptions caused by freezing and thawing of the surface soil are not the primary driver of FT-induced N 2 O emissions under field conditions." @default.
- W2976892420 created "2019-10-03" @default.
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- W2976892420 date "2019-12-01" @default.
- W2976892420 modified "2023-10-18" @default.
- W2976892420 title "Rates and intensity of freeze–thaw cycles affect nitrous oxide and carbon dioxide emissions from agricultural soils" @default.
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- W2976892420 doi "https://doi.org/10.1139/cjss-2019-0058" @default.
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