Riparian buffer strips can have a significant role in reducing nitrogen (N) transfers from agricultural land to freshwater primarily via denitrification and plant uptake processes, but an unintended trade-off can be elevated nitrous oxide (N₂O) production rates. Against this context, our replicated bounded plot scale study investigated N₂O emissions from un-grazed ryegrass pasture served by three types of riparian buffer strips with different vegetation, comprising: (i) grass riparian buffer with novel deep-rooting species, (ii) willow (young trees at establishment phase) riparian buffer, and (iii) deciduous woodland (also young trees at establishment phase) riparian buffer. The experimental control was ryegrass pasture with no buffer strip. N₂O emissions were measured at the same time as total oxidized N in run-off, and soil and environmental characteristics in the riparian buffer strips and upslope pasture between 2018 and 2019. During most of the sampling days, the no-buffer control treatment showed significantly (P < 0.05) greater N₂O fluxes and cumulative N₂O emissions compared to the remainder of the treatments. Our results also showed that the grass riparian buffer strip is a sink of N₂O equivalent to − 2310.2 g N₂O-N ha⁻¹ day⁻¹ (95% confidence interval:−535.5 to 492). Event-based water quality results obtained during storms (12 November 2018 and 11 February 2019) showed that the willow riparian buffer treatment had the highest flow-weighted mean N concentrations (N-FWMC) of 0.041 ± 0.022 and 0.031 ± 0.015 mg N L⁻¹, when compared to the other treatments. Our 9-month experiment therefore, shows that riparian buffer strips with novel deep-rooting grass can therefore potentially address emissions to both water and air. The results imply that over a shorter timeline similar to the current study, the grass riparian buffer strip can potentially address N emission to both air and water, particularly when serving a permanent pasture in similar settings as the current experiment.

河岸缓冲带主要通过反硝化和植物吸收过程在减少从农业用地向淡水的氮 (N) 转移方面发挥重要作用，但意外的权衡可能是提高一氧化二氮 (N ₂ O) 的生产率。在此背景下，我们复制的有界小区规模研究调查了由具有不同植被的三种类型的河岸缓冲带服务的未放牧黑麦草牧场的 N ₂ O 排放，包括：（i）具有新型深根物种的草河岸缓冲带，（ii ) 柳树（处于建立阶段的幼树）河岸缓冲区，以及 (iii) 落叶林地（也处于建立阶段的幼树）河岸缓冲区。实验对照是没有缓冲带的黑麦草牧场。氮₂2018 年至 2019 年间，O 排放量与径流中的总氧化 N 以及河岸缓冲带和上坡草场的土壤和环境特征同时测量。在大多数采样日内，无缓冲控制处理表现出显着( P < 0.05 )与其余处理相比， N ₂ O 通量和累积 N _{2 O 排放量更大。}我们的研究结果还表明，草河岸缓冲带是一个 N ₂ O 汇，相当于 - 2310.2 g N ₂ O-N ha ^-1天^-1（95% 置信区间：-535.5 至 492）。在暴风雨期间（2018 年 11 月 12 日和 2019 年 2 月 11 日）获得的基于事件的水质结果表明，柳树河岸缓冲处理具有最高的流量加权平均氮浓度 (N-FWMC)，分别为 0.041 ± 0.022 和 0.031 ± 0.015 mg N L ^{- 1}与其他治疗相比。因此，我们为期 9 个月的实验表明，具有新型深根草的河岸缓冲带可以潜在地解决对水和空气的排放问题。结果表明，在与当前研究相似的较短时间线上，草河岸缓冲带可以潜在地解决 N 排放到空气和水中的问题，特别是在与当前实验类似的环境中提供永久牧场时。