北京郊区大气氨的来源分配通过N-稳定同位素透露了15个
Sijie Feng1, Meitong Li1, Kaiyan Wang1
1State Key Laboratory of Nutrient Use and Management, College of Resources and Environmental Sciences, National Academy of Agriculture Green Development, National Observation and Research Station of Agriculture Green Development (Quzhou, Hebei), China Agricultural University, Beijing 100193, China.
The Science of the total environment
|February 7, 2024
概括
农业资源,而不是非农业,主导了北京郊区的农业资源.
科学领域:
- 环境科学 环境科学
- 大气化学 大气化学
- 同位素地球化学 同位素地球化学
背景情况:
- 大气氨 (NH3) 是大型城市的关键空气污染物.
- 非农业来源,如化石燃料,是已知的城市NH3贡献者.
- 郊区NH3的动态和来源仍未得到充分研究.
研究的目的:
- 调查北京郊区的空间和时间NH3模式.
- 量化农业和非农业NH3来源的贡献.
- 确定导致NH3排放的特定农业活动.
主要方法:
- 在四个郊区地点进行16-22个月的NH3度监测.
- 使用delta 15N稳定同位素方法进行源分配.
- 分析了NH3度和同位素特征的季节性变化.
主要成果:
- 农业来源 (53%) 是北京郊区NH3排放的主要驱动因素.
- 在夏季和春季,施肥 (37%) 和畜牧 (32%) 显著增加了NH3.
- 季节性变化显示,秋冬季的农业和非农业贡献几乎相等.
结论:
- 北京郊区的NH3污染主要来自农业活动.
- 有针对性的对肥料使用和牲畜管理的控制至关重要.
- 北京需要针对农业和车辆排放的协调战略.
相关概念视频
01:20Overview of Nitrogen Metabolism
7.9K
Nitrogen is a very important element for life because it is a major constituent of proteins and nucleic acids. It is a macronutrient, and in nature, it is recycled from organic compounds and stored in the form of ammonia, ammonium ions, nitrate, nitrite, or nitrogen gas by many metabolic processes. Many of these metabolic processes are carried out only by prokaryotes.
The largest pool of nitrogen available in the terrestrial ecosystem is gaseous nitrogen (N2) from the air, but this...
The largest pool of nitrogen available in the terrestrial ecosystem is gaseous nitrogen (N2) from the air, but this...
7.9K
01:13Mass Spectrometry: Isotope Effect
2.1K
Most elements exist in nature as a mixture of isotopes. The isotopes differ in weight due to their respective number of neutrons. The molecular weight of a molecule is different depending on the specific isotope of its elements involved. As a result, the mass spectrum of the molecule exhibits peaks from the same fragment at multiple positions. The positions of these mass signals depend on the difference between the molecular mass. Furthermore, the intensity of these signals is dependent on the...
2.1K