Isotopic characteristics and source analysis of atmospheric ammonia during agricultural periods in the Xichuan area of the Danjiangkou Reservoir  

作　　者：Xiaoshu Chen Tongqian Zhao Chunyan Xiao Xiaoming Guo Feihong Chen 

机构地区：[1]Institute of Resources and Environment,Henan Polytechnic University,Jiaozuo 454000,China

出　　处：《Journal of Environmental Sciences》2024年第2期460-469,共10页环境科学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (Nos.U1704241 and 42007175);the Plan for Scientific Innovation Talent of Henan Province (No.194200510010);the Science Research Funds for the Universities of Henan Province (No.NSFRF200326)。

摘　　要：Nitrogen deposition is an important means of exogenous nitrogen input in reservoir water.Agricultural activities around the reservoir lead to a sharp increase in the concentration of ammonia in the atmosphere,which poses a threat to the reservoir water body.Clarifying the contribution of agricultural ammonia release to atmospheric NH_(x)(gaseous NH_(3)and particulate NH_(4)^(+)),in the reservoir area can provide a theoretical foundation for local reactive nitrogen control.We collected atmospheric NH_(3)and NH_(4)^(+)samples during the agricultural periods and analyzed the isotopic characteristics of atmospheric NH_(x)and the contribution rates of different ammonia sources in the Xichuan area of the Danjiangkou Reservoir.The results showed that the initialδ~(15)N values of NH_(3)(-30.0‰to–7.2‰)and particulate NH_(4)^(+)(–33‰to+4.9‰for finer and coarser particles,respectively)are different,and their contribution ratios from dissimilar ammonia sources are also different,among which NH_(4)^(+)is more susceptible to meteorological factors.However,since the atmospheric NH_(x)in the Xichuan area is mainly gaseous NH_(3),the final sources of atmospheric ammonia nitrogen source depend on gaseous NH_(3).Agricultural sources(59%-74%)were the main NH_(3)sources in this area.Among them,the fertilizer use emission was dominant;it had the highest contribution rate in summer during the agricultural period and a more prominent impact in areas with less human interference.Reasonable regulation of the application of high-ammonia releasing fertilizer,especially during the agricultural period in summer,is an effective way to reduce the threat of atmospheric ammonia to water health.

关 键 词：Danjiangkou reservoir Atmospheric ammonia nitrogen ISOTOPE Ammonia source analysis Agricultural sources 

分 类 号：X51[环境科学与工程—环境工程]