Progress in Research on Atmospheric Active Nitrogen in Arid Area of ​​Xinjiang Habitat
Nitrogen is the basic constituent element of protein, nucleic acid, chlorophyll and other key organic molecules. As one of the main limiting factors for the productivity of terrestrial and marine ecosystems, nitrogen is essential for maintaining the relationship between biodiversity and ecosystem functions.
The chemical nature of nitrogen is very stable, and it is not easy to chemically react with other substances at room temperature. However, active nitrogen is very active. The excessive accumulation of nitrides formed after entering the atmosphere can bring smog and acid rain, destroy the ozone layer, and exacerbate global warming. Atmospherically active nitrogen is a general term for nitrogen-containing compounds with biological, photochemical and radiation activity in the atmosphere, mainly including inorganic reducing nitrogen, inorganic oxidizing nitrogen and organic nitrogen. Data from the European Nitrogen Assessment Report published in 2011 show that the direct economic loss caused by active nitrogen pollution to human health, biodiversity and climate change averages 320 billion euros per year, directly reducing the average European life expectancy by about 6 month.
The research team of Liu Xuejun, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, with the support of the Hundred Talents Program of the Chinese Academy of Sciences and the National Natural Science Foundation of China, took the typical ecosystems in the arid area of ​​Xinjiang as the target to carry out the concentration of NH3, NO2, pNH4 + and pNO3−. System research lasting 3 years. The results showed that the concentrations of four kinds of atmospheric active nitrogen showed significant spatio-temporal changes, with annual average values ​​of 7.71, 9.68, 1.81, and 1.13 μg N m−3, and the concentration of PM10 was 249.2 μg m−3. The order of active nitrogen concentration in each ecosystem is: alpine steppe <desert <desert oasis interlaced zone <farmland <suburbs <city. Winter has higher concentrations of NO2, pNH4 +, pNO3− and lower NH3 concentrations, indicating that air pollution caused by human activities such as heating and heating, motor vehicles, and industry should be controlled.
The above study, titled Atmospheric reactive nitrogen concentrations at ten sites with contrasting land use in an arid region of central Asia, was published in Biogeosciences.
Annual average active nitrogen concentration of different ecosystems in arid area of ​​Xinjiang
Seasonal Variation of Active Nitrogen Concentrations in Different Ecosystems in Arid Area of ​​Xinjiang
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