Method for Studying the Impact of Atmospheric Nitrogen Deposition on Water Environment of Drinking Water Sources

Atmospheric nitrogen deposition is one of the most important pollution sources. Therefore, the accurate identification of the source, type, amount and spatial distribution of atmospheric nitrogen deposition is the pre-condition to safeguard drinking water safety. We adopted ion exchange resin method for stationing-based observation in the whole drainage basin, in order to reveal the chemical property, spatial & temporal distribution and flux variation of atmospheric nitrogen deposition. Based on the critical load of nitrogen which can be absorbed and degraded in various ecosystems, we accurately calculated the amount of atmospheric nitrogen entering reservoir in the whole drainage basin, analyzed and predicted the impact of atmospheric nitrogen deposition on water environment. We attempted to find out the reasons for standard-exceeding nitrogen level and eutrophication in drinking water sources despite long-period management, so as to provide reference for decision-making related to drinking water source protection and pollution abatement.