Riparian buffer strips influence nitrogen losses as nitrous oxide and leached N from upslope permanent pasture
Riparian buffer strips influence nitrogen losses as nitrous oxide and leached N from upslope permanent pasture
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河岸缓冲带会影响氮的损失，因为一氧化二氮和从坡上永久牧场浸出的氮
DOI：
10.1016/j.agee.2022.108031
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Dlamini J
中科院分区：
文献类型：
--
作者：
Dlamini J
河岸缓冲带可主要通过反硝化和植物吸收过程，在减少农田向淡水转移氮(N)方面发挥重要作用，但意外的权衡可能是提高一氧化二氮(N2O)的产生率。在此背景下，我们的重复有限小区规模研究调查了三种不同植被类型的河岸缓冲区对未放牧黑麦草牧场N2O排放的影响，包括：(I)具有新的深生根物种的草河岸缓冲区，(Ii)柳树(建植阶段的幼树)河岸缓冲区，以及(Iii)落叶林地(也是建树阶段的幼树)河岸缓冲区。试验对照为黑麦草草地，不设缓冲带。同时测量了2018-2019年河岸缓冲带和上坡牧场的N2O排放量和径流中的总氧化氮以及土壤和环境特征。在大多数采样日，无缓冲对照处理的N2O通量和累积N2O排放量显著(P<0.05)高于其余处理。我们的结果还表明，草质河岸缓冲带是相当于−的N2O汇，相当于2310.2 mg·N2O-N ha−1day−1(95%可信区间：−535.5至492)。风暴期间(2018年11月12日和2019年2月11日)基于事件的水质结果显示，与其他处理相比，柳树河岸缓冲处理的流量加权平均氮浓度(N-FWMC)最高，分别为0.041±0.022和0.031±0.015 mg·N-−-1。因此，我们为期9个月的实验表明，河岸缓冲地带与新的深根草因此可以潜在地解决对水和空气的排放。结果表明，在与目前的研究类似的较短的时间线上，草地河岸缓冲带可以潜在地解决向空气和水中排放N的问题，特别是在为与当前实验相似的环境中的永久牧场服务时。
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−1day−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.
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