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- W4285585189 abstract "Rice paddy surface soils emit substantial amounts of atmospheric nitrous oxide (N2O). However, the soil can also act as sites for the abiotic and biological consumption of some of the N2O produced in the soil profile, thus, reducing net N2O emissions. Determining the proportion of N2O consumed in the soil, as well as the amount of N2O microbially reduced to nitrogen (N2) is critical for developing N2O mitigating strategies in paddy soils. However, few studies have focused on these processes. Furthermore, the association of microorganisms containing nosZI and nosZII genes with variations in biological N2O consumption potential remains largely unexplored. Here, moisture-controlled (60% gravimetric water content, GWC) and completely anoxic (helium [He] system) microcosm experiments were conducted on paddy surface soils (0–5 cm deep) treated with N2O. During a 96-h incubation period, the N2O cumulative emissions were monitored, the total N2O consumption and N2 production were quantified, and the population sizes of nosZI- and nosZII-containing microorganisms were analyzed. The results showed that 97.87%–99.99% of the N2O that accumulated in the 5 cm soil profile were consumed before emission, and the N2 increase in these soils accounted for 64.50%–82.44% of the total N2O consumption, indicating that the total N2O consumption potential and biological N2O sink capacity of paddy surface soils were considerable under experimental conditions. Furthermore, the production of N2 from N2O seemed to be positively related to soil pH, with less N2 being produced in more acidic soil. In addition, nosZI gene abundance had a strong positive correlation with N2 production, while nosZII had a much weaker correlation. Considering the positive correlation between N2 production and soil dissolved organic carbon (DOC) consumption and available potassium content (AK), it is speculated that complete denitrification by nosZI-N2O reducers dominate the N2O biological sink capacity of the paddy surface soils investigated in this study." @default.
- W4285585189 created "2022-07-16" @default.
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- W4285585189 date "2022-11-01" @default.
- W4285585189 modified "2023-09-28" @default.
- W4285585189 title "Stronger link of nosZI than nosZII to the higher total N2O consumption in anoxic paddy surface soils" @default.
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- W4285585189 doi "https://doi.org/10.1016/j.geoderma.2022.116035" @default.
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