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nitrate, ammonia, snow, precipitation , hydrology, biological processes
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Two sampling campaign were carried on in 2007 and 2008 in order to collect running water samples from high elevation zone (4500-5500 m asl) in the Sagarmatha National Park. The water samples will be analyzed for the main nitrogen species (N-NO3, N-NH4, TN) and for the principal hydro-chemical constituents (Ca, Mg, Na, K, Cl, SO4, HCO3). The concentration and the temporal variation of nitrogen species were related to the N concentration of lakes and to the fluxes of wet deposition from the same area.