Research on the Characteristics of Atmospheric Wet Nitrogen Deposition in the Urban Areas of Nanchong City
In order to further understand the change characteristics of atmospheric nitrogen deposition in the main urban areas of Nanchong City,the precipitation collection method was used to observe the atmospheric nitrogen wet deposition from March 2019 to February 2020 in Nanchong City,and the total soluble nitrogen(TDN)and soluble inorganic nitrogen(DIN)in precipitation were analyzed.The dynamics of the concentration and sedimen-tation flux of ammonium nitrogen(NH4-N),nitrate nitrogen(NO3--N)and soluble organic nitrogen(DON)were analyzed.The results showed as follows:①the seasonal concentrations of TDN,DON,NH4-N and DIN showed a trend of higher spring and winter and lower summer and autumn,while the seasonal concentrations of NO3--N showed a trend of higher spring and summer and lower autumn and winter;②the sedimentation fluxes of TDN,DON and DIN showed a seasonal variation trend of high in summer and autumn and low in spring and winter;the NO3--N sedimentation fluxes showed a trend of high in spring and summer and low in autumn and winter;and the NH4-N sedimentation concentration showed a trend of high in summer and autumn and low in spring and winter;③in terms of spatial differences,there is no significant difference in sedimentation concentration among the four observation points.In summary,the precipitation of wet nitrogen in Nanchong City is significant,and soluble or-ganic nitrogen is the main factor,which has a certain effect of increasing fertilizer and may promote the develop-ment of regional forestry and agriculture.
nitrogen depositionprecipitationecological function zonemeteorological factorsatmospheric pol-lutanturban areas of Nanchong City
万方数据
维普
