Atmospheric organic nitrogen deposition around the Danjiangkou Reservoir: Fluxes, characteristics and evidence of agricultural source

• Published in: Environmental pollution (1987) 2024-01, Vol.341, p.122906-122906, Article 122906
• Main Authors: Zhang, Qingmiao, Guo, Xiaoming, Zhao, Tongqian, Jin, Chao, Xiao, Chunyan, He, Yuxiao
• Format: Article
• Language: English
• Subjects: Agriculture; Air Pollutants - analysis; Ammonium Compounds - analysis; ammonium nitrogen; anthropogenic activities; China; dissolved organic nitrogen; dry deposition; Environmental Monitoring - methods; Nitrogen - analysis; pollution; wet deposition
• ISSN: 0269-7491; 1873-6424
• DOI: 10.1016/j.envpol.2023.122906

Dissolved organic nitrogen (DON) deposition was the substantial component of dissolved total nitrogen (DTN) deposition in the world's nitrogen deposition hot spots areas. However, the information on the importance for DON deposition and its sources was still scarce, which limited the comprehensive assessment of the ecological threat from nitrogen deposition. Six sampling sites around the Danjiangkou Reservoir were set up to collect the dry and wet deposition samples from October 2017 to September 2021. The results showed that dry and wet DTN deposition averaged 34.72 kg ha yr and 22.27 kg ha yr , respectively. Dry NH -N, NO -N and DON deposition averaged 14.28 kg ha yr , 5.91 kg ha yr and 14.53 kg ha yr , respectively. Wet NH -N, NO -N and DON deposition averaged 11.14 kg ha yr , 3.89 kg ha yr and 7.24 kg ha yr , respectively. The contributions of DON to DTN were 41.85% (in dry deposition) and 32.50% (in wet deposition), respectively. Dry DON deposition varied between 26.44 kg ha yr and 9.11 kg ha yr , and significantly differed among six sampling sites (P