Nitrogen emission and deposition budget in West and Central Africa

摘要: Atmospheric nitrogen depends on land surface exchanges of compounds. In Sub Saharan Africa, deposition and emission fluxes compounds are poorly quantified, likely to increase in the near future due use change anthropogenic pressure. This work proposes an estimate atmospheric N budget West Central along ecosystem transect, from dry savanna wet forest, for years 2000�2007. The may be considered as a one point time budget, included long term studies first reference Africa. Gaseous estimated by considering concentrations measured frame IDAF network (IGAC/DEBITS/AFrica) at monthly scale modeling velocities sites, taking into account bi directional exchange ammonia. Particulate calculated using same inferential method. Wet measurements ammonium nitrate chemical content precipitations sites combined with annual rainfall amount. terms emission, biogenic NO emissions simulated each site model coupled module elaborated artificial neural equation. Ammonia volatilization literature data livestock quantity country manure. NOx NH3 biomass burning domestic fires satellite factors. total shows that sources equilibrium savannas, respectively 7.40 (±1.90) deposited 9.01 (±3.44) kgN ha �1 yr emitted savanna, 8.38 (±2.04) 9.60 (±0.69) savanna. forested ecosystems, is dominated plus processes (14.75±2.36 ), compared (8.54±0.50 ).