Dry deposition velocity of atmospheric nitrogen in a typical red soil agro-ecosystem in Southeastern China

摘要: Atmospheric dry deposition is an important nitrogen (N) input to farmland ecosystems. The main compounds in the atmosphere include gaseous N (NH3, NO2, HNO3) and aerosol (NH4 +/NO3 −). With knowledge of increasing agricultural effects by nitrogen, researchers have paid great attention this topic. Based on big-leaf resistance model, velocities (V d) a typical red soil agro-ecosystem, Yingtan, Jiangxi, Southeastern China, were estimated with data from Auto-Meteorological Experiment Station during 2004–2007. results show that hourly dh) range 0.17–0.34, 0.05–0.24, 0.57–1.27, 0.05–0.41 cm/s for NH3, HNO3, N, respectively, V dh much higher daytime than nighttime had peak value around noon. Monthly dm) 0.14–0.36, 0.06–0.18, 0.07–0.25 cm/s respectively. Their minimum values appeared June August, while their maximum occurred February March each year. HNO3 July year, dm(HNO3) ranged 0.58 1.31 cm/s 4 years. As seasonal ds), ds(NH3), ds(NO2), ds(aerosol N) winter or spring significantly those summer autumn, ds(HNO3) winter. In addition, there no significant difference among all annual means da). average 4 years 0.26, 0.12, 0.81, 0.16 cm/s, model convenient feasible estimate velocity atmospheric agro-ecosystem.