同位素技术示踪水环境生源要素氮的来源及循环过程研究进展OA北大核心CSTPCD

Nitrogen is an essential biogenic element in ecosystems,and plays important role in maintain-ing the quality of aquatic environment and the balance of ecological system.However,nitrogen pollution in water environments has been becoming increasingly severe,posing a global environmental challenge.In this article,we reviewed the research advances on study of nitrogen source analysis and cycling pro-cesses in water environments.First,we summarized the main sources of nitrogen in the aquatic environ-ments(including natural sources and anthropogenic sources),and discussed the spatiotemporal variation characteristics of nitrogen in water environments,emphasizing the impact of natural factors(such as rain-fall)and human activities(like sewage discharge and agricultural fertilization)on the distribution of nitro-gen.Then we elaborated the development of isotope technology in identifying the sources of nitrogen in the aquatic environment,which mainly went through three stages:the single isotope tracing phase,the du-al isotope tracing phase,and the multi-isotope combined tracing phase.Next,we discussed the application of isotopic techniques in the analysis of nitrogen cycling processes in water environments,including nitri-fication,denitrification,mineralization,and assimilation.Finally,we analyzed the shortcomings of current research and put forward the future development trend,especially in the potential combination of isotopic techniques and machine learning.