Characteristics and Source Identification of Groundwater Nitrogen Pollution in Qingyang Area
Groundwater is an important water source for human life and production,but the problem of groundwater nitrogen pollution is becoming increasingly prominent.Taking Qingyang area as the research object,the characteristics and source identification of groundwater nitrogen pollution were analyzed.The results show that the"three-nitrogen"pollution degree of groundwater in the study area presents a trend of nitrate nitrogen(NO3-)＞ammonia nitrogen(NH4+)＞nitrite nitrogen(NO2-),and there is a significant negative correlation between the concentrations of NO3-N and NH4+-N and the groundwater depth.NO2--N is less affected by the buried depth.The values of dissolved oxygen concentration indicate that the groundwater is not suitable for denitrification,and the ratio of δ15N to δ18O indicates that the aquifer conditions are not conducive to denitrification.Secondly,the main pollution sources include nitrate nitrogen fertilizer,atmospheric sedimentation,feces and domestic sewage.The research results help prevent over-exploitation and groundwater pollution,thus maintaining the sustainability and ecological integrity of groundwater resources in Qingyang area,which is of great significance for environmental protection and sustainable development.
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