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- Title
Increased soil-derived N<sub>2</sub>O production following a simulated fall-freeze–thaw cycle: effects of fall urea addition, soil moisture, and history of manure applications.
- Authors
Lin, Sisi; Hernandez-Ramirez, Guillermo
- Abstract
Adding nitrogen fertilizers to soils can induce short-term changes in soil N pools, and consequently cause extra release of nitrous oxide (N2O) emissions that are sourced directly from soils rather than from added N – a response termed the 'priming effect'. However, it is unknown how priming effects on nitrous oxide (N2O) emissions can be altered following a strong freeze–thaw cycle. A mesocosm (pot) experiment evaluated two soil managements: with and without history of manure applications. These soils were subjected to three moisture regimes: Low, Medium and High. Apart from the controls, which received no N, we banded 15 N-labelled urea into these soils representing a typical fall fertilization, and subsequently simulated a wide fall-freeze–thaw cycle, with temperatures from + 2, to − 18, and finally + 23 °C, respectively. The overall highest N2O production was observed 1 day after thawing. At that time, measurements of N2O site preference indicated that denitrification produced 83% of the N2O flux. Relative to the unamended controls (baseline), adding urea consistently triggered a 24% greater cumulative N2O production originated from soil N following thawing (245 vs. 305 μg N2O-N kg−1 soil, P = 0.022). This substantiates a positive priming of N2O that manifested shortly after the rapid, wet thawing of the soils. Soils having a manure history or higher moisture also exhibited an augmented production of N2O from soil N rather than from the added urea (Ps < 0.01). Although the overall N2O priming was positive, two weeks after thawing, negative priming of daily N2O fluxes also occurred, but only in soils under High moisture. Besides urea addition, the propensity for primed N2O emissions after soil thawing was enhanced under higher moisture conditions and in the soil with history of manure applications.
- Subjects
SOIL moisture; UREA as fertilizer; UREA; NITROGEN fertilizers; MANURES; NITROUS oxide; FREEZE-thaw cycles
- Publication
Biogeochemistry, 2022, Vol 157, Issue 3, p379
- ISSN
0168-2563
- Publication type
Article
- DOI
10.1007/s10533-021-00880-x