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- W3130541708 abstract "• Horticultural stream nutrients and greenhouse gases were sampled for 66 days. • Aquatic N 2 O emissions were amongst the highest reported from global waterways. • Creek N 2 O emissions were driven by surface runoff rather than groundwater seepage. • N 2 O emissions represented ~10% of total carbon dioxide equivalent emissions. • Mean nitrate + nitrite loads ranged from 0.4 to 272 µmol m 2 day -1 . Nitrogen (N) leaching from agricultural systems is a global threat to waterways. However, indirect aquatic emissions of the potent greenhouse gas nitrous oxide (N 2 O) from agricultural runoff remain poorly understood. Here, we assess how episodic rain events flushing an agricultural catchment drive N, radon (a natural groundwater tracer) and N 2 O emissions. We reveal significant nitrate + nitrite (NO X ) loads and N 2 O emissions consistent with N leaching and runoff into Hearnes Lake, Australia. Aquatic N loads were equivalent to ~15% of the applied fertiliser and dominated by NO X (78%). Aquatic N 2 O (up to 5655% sat.) and atmospheric emissions (up to 2859 µmol m 2 day −1 ) were amongst the highest reported from global waterways. N 2 O fluxes experienced large variations (~800 fold) between stagnant and rain periods. Observed N 2 O emissions and IPCC EF 5 N 2 O emissions were 17.2 g N 2 O-N day −1 and 72.6 g N 2 O-N day −1 , respectively. Estimated N 2 O emissions ~2 km downstream of farms were 0.79% of dissolved inorganic nitrogen (DIN) loads and 0.04% of applied fertiliser. Aquatic N 2 O emissions represented ~10% of the total (CO 2 + CH 4 + N 2 O) CO 2 equivalent emissions which is ~60% higher than the IPCC global N 2 O average. Episodic rain events, rather than groundwater seepage traced by radon, were the major drivers of both NO X and N 2 O, highlighting the importance of detailed sampling approaches to capture extreme emission variabilities in heavily fertilised catchments." @default.
- W3130541708 created "2021-03-01" @default.
- W3130541708 creator A5039686319 @default.
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- W3130541708 creator A5068963211 @default.
- W3130541708 creator A5084825044 @default.
- W3130541708 date "2021-05-01" @default.
- W3130541708 modified "2023-10-17" @default.
- W3130541708 title "Large aquatic nitrous oxide emissions downstream of intensive horticulture driven by rain events" @default.
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