Riparian zones provide multiple benefits in agricultural landscapes, but nitrogen (N) loading can cause N 2 O emissions. There is a knowledge gap on how different types of riparian vegetation influence N 2 O emissions. This study quantified N 2 O emissions from a rehabilitated riparian zone with deciduous trees (RH), a herbaceous (grassed) riparian zone (GRS), a natural forested riparian zone with deciduous trees (UNF-D), a natural forested riparian zone with coniferous trees (UNF-C), and an agricultural field (AGR). N 2 O fluxes were not significantly different ( p > 0.05) among riparian zones (11–17 µg N 2 O-N m −2 h −1 ) and were not significantly different ( p > 0.05) when comparing riparian zones to the AGR field (34 µg N 2 O-N m −2 h −1 ). Despite high N-loading, cumulative N 2 O emissions (1989 µg N 2 O-N m −2 ) in the riparian zones was significantly lower ( p > 0.05) than AGR (13,278 µg N 2 O-N m −2 ). The main predictors of N 2 O fluxes were soil temperature and soil NO 3 − -N for the riparian zones and the AGR field. We found that environmental conditions played a greater role than the type of riparian vegetation or age in predicting N 2 O emissions. We suggest that soil environmental factors created an anaerobic environment that favored N 2 O consumption via complete denitrification.

中文翻译：

---

植被类型不影响农业景观中河岸带的一氧化二氮排放

河岸带在农业景观中提供多种好处，但氮 (N) 负载会导致 N 2 O 排放。在不同类型的河岸植被如何影响 N 2 O 排放方面存在知识空白。本研究量化了落叶树 (RH) 修复河岸带、草本（草）河岸带 (GRS)、落叶树天然林河岸带 (UNF-D)、天然森林河岸带的 N 2 O 排放量针叶树 (UNF-C) 和农田 (AGR)。N 2 O 通量在河岸带 (11–17 µg N 2 ON m -2 h -1 ) 之间没有显着差异 ( p > 0.05) 并且在将河岸带与 AGR 田进行比较时没有显着差异 ( p > 0.05) ( 34 µg N 2 ON m -2 h -1 )。尽管 N 负荷很高，河岸带的累积 N 2 O 排放量（1989 µg N 2 ON m -2 ）明显低于 AGR（13,278 µg N 2 ON m -2 ）（p > 0.05）。N 2 O 通量的主要预测因子是河岸带和AGR 田的土壤温度和土壤NO 3 - -N。我们发现，在预测 N 2 O 排放量方面，环境条件比河岸植被类型或年龄发挥了更大的作用。我们认为土壤环境因素创造了一个厌氧环境，有利于通过完全反硝化作用消耗 N 2 O。我们发现，在预测 N 2 O 排放量方面，环境条件比河岸植被类型或年龄发挥了更大的作用。我们认为土壤环境因素创造了一个厌氧环境，有利于通过完全反硝化作用消耗 N 2 O。我们发现，在预测 N 2 O 排放量方面，环境条件比河岸植被类型或年龄发挥了更大的作用。我们认为土壤环境因素创造了一个厌氧环境，有利于通过完全反硝化作用消耗 N 2 O。