Contribution of dissolved organic nitrogen deposition to total dissolved nitrogen deposition under intensive agricultural activities

• Published in: Water, air, and soil pollution Vol. 178; no. 1-4; pp. 5 - 13
• Main Authors: Ham, Y.S, Tamiya, S
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer 01.01.2007; Springer Nature B.V
• Subjects: agricultural land; air pollution; ammonium nitrate; ammonium nitrogen; Animal husbandry; Applied sciences; atmospheric deposition; Atmospheric pollution; Dispersed sources and other; Dissolved organic nitrogen; Environmental monitoring; Exact sciences and technology; Fertilizers; Intensive farming; linear models; Nitrogen; nitrogen fertilizers; Organic nitrogen; Pollution; Pollution sources. Measurement results; Regression analysis; soil pollution; Wet deposition; Japan; Asia; Intensive agricultural area; Nitrogen fertilization; Organic nitrogen; Farming animal; Atmospheric fallout; Intensive farming; Nitrogen compounds; Deposition rate; Animal husbandry; Wet deposition; Pollutant emission; Dissolved matter; DON Fertilizer; Limiting factor; Bulk deposition; Air pollution; Agricultural waste; NH4; Animal waste
• ISSN: 0049-6979; 1573-2932
• DOI: 10.1007/s11270-006-9109-y

For elucidating the atmospheric deposition contribution of dissolved organic nitrogen (DON) to the total dissolved nitrogen (TDN) deposition rate, dissolved inorganic nitrogen (DIN: NH₄ ⁺ + NO₃ -) and DON deposition rates were annually and monthly estimated during 4 and half-yr monitoring period in an experimental multi-farm under intensive agricultural activities of N fertilizer use and animal husbandry in Central Japan. Annual NH₄ ⁺, DON and NO₃ - deposition rates in bulk and wet deposition data accounted for 48%, 32% and 20% of TDN deposition, respectively, which indicated that this area is strongly affected by the intensive agricultural activities. The DIN and DON deposition rates were respectively estimated at 21.6 and 10.1 kg N ha-¹ yr-¹, which ranked high in a worldwide regional data set. Consequently, this area has been exposed to a large amount of N deposition including DON with N fertilizer input. The difference between bulk and wet deposition rates (NH₄ ⁺ and DON) is one of important factors controlling the N deposition in this area. Monthly DON deposition showed positive correlations with DIN and NH₄ ⁺ deposition rates, respectively, with a significant linear regression curve. The linear regression curve of our monthly data (n = 127) indicates the same trend as the worldwide annual data set (n = 31).