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首页> 美国卫生研究院文献>Scientific Reports >Mobile continuous-flow isotope-ratio mass spectrometer system for automated measurements of N2 and N2O fluxes in fertilized cropping systems
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Mobile continuous-flow isotope-ratio mass spectrometer system for automated measurements of N2 and N2O fluxes in fertilized cropping systems

机译：移动连续流同位素比质谱仪系统用于自动测量施肥作物系统中的N2和N2O通量

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摘要

The use of synthetic N fertilizers has grown exponentially over the last century, with severe environmental consequences. Most of the reactive N will ultimately be removed by denitrification, but estimates of denitrification are highly uncertain due to methodical constraints of existing methods. Here we present a novel, mobile isotope ratio mass spectrometer system (Field-IRMS) for in-situ quantification of N2 and N2O fluxes from fertilized cropping systems. The system was tested in a sugarcane field continuously monitoring N2 and N2O fluxes for 7 days following fertilization using a fully automated measuring cycle. The detection limit of the Field-IRMS proved to be highly sensitive for N2 (54 g ha−1 day−1) and N2O (0.25 g ha−1 day−1) emissions. The main product of denitrification was N2 with total denitrification losses of up to 1.3 kg N ha−1 day−1. These losses demonstrate sugarcane systems in Australia are a hotspot for denitrification where high emissions of N2O and N2 can be expected. The new Field-IRMS allows for the direct and highly sensitive detection of N2 and N2O fluxes in real time at a high temporal resolution, which will help to improve our quantitative understanding of denitrification in fertilized cropping systems.
机译：上个世纪以来，合成氮肥的使用呈指数增长，给环境带来了严重后果。大部分反应性N最终将通过反硝化去除，但是由于现有方法的方法限制，反硝化的估计非常不确定。在这里，我们介绍了一种新颖的移动同位素比率质谱仪系统（Field-IRMS），用于现场定量分析受精耕作系统中的N2和N2O通量。该系统在甘蔗田中进行测试，在受精后使用全自动测量周期连续7天监测N2和N2O通量。事实证明，Field-IRMS的检出限对N2（54 g ha -1 day -1 ）和N2O（0.25 g ha -1 day −1 ）排放。反硝化的主要产物为N2，总反硝化损失高达1.3 kg N ha -1 day -1 。这些损失表明，澳大利亚的甘蔗系统是反硝化的热点地区，预计可以大量排放N2O和N2。新的Field-IRMS可以以高的时间分辨率实时，直接，高度灵敏地检测N2和N2O通量，这将有助于增进我们对施肥耕作系统中反硝化的定量理解。

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