多同位素联合SIAR模型解析城市化进程中水源地水体氮的来源及其迁移转化机制

本研究拟以东苕溪流域水环境为研究对象，开展水体氮污染机制及源解析的定量研究。利用环境地球化学研究理论和手段，通过聚类分析、主成分分析等多元数理统计分析方法，结合硝酸盐的氮氧同位素和水的氢氧同位素方法，运用SIAR模型，以期明晰水质的时空变化规律，评估水体氮污染现状，揭示东苕溪流域水体硝酸盐N、O同位素组成和水H、O同位素组成和它们的变化特征，进行东苕溪流域水体氮污染源解析的定量分析，预测氮污染物的入河通量，探讨引起氮输送量变化的影响因素，阐明水体氮污染机制，力求为有效抑制东苕溪水体氮污染提供重要的理论依据，为完善水环境污染物源解析技术提供科学依据，将有利于城市化进程中水源地水质的达标控制和水资源的有效利用。

This work is proposed to deal with research on the nitrogen pollution mechanism and the quantification of nitrate sources in the East Tiaoxi watershed. The water environment in the East Tiaoxi watershed will be studied by using the theory and method of the environmental geochemical study, using of multivariate statistical analysis, such as, cluster analysis, principal component analysis, using nitrogen-oxygen isotopes and hydrogen-oxygen isotopes and using SIAR model. The spatial-temporal characteristics of water quality will be found, the status of nitrogen pollution will be evaluated in East Tiaoxi. The variable characteristics of nitrogen-oxygen isotopes and hydrogen-oxygen isotopes composition will be revealed. The identification and quantification of nitrogen sources will be indicated in East Tiaoxi watershed. The flux of nitrogen pollutants into East Tiaoxi and the factors effected the flux will be predicted. The nitrogen pollution mechanism of water will be expounded. The research could provide the scientific basis to control nitrogen pollution in the East Tiaoxi watershed. It could improve the theoretical basis for pollution source identification and quantification in water environment. It will be conducive to the control of water quality and has effective utilization of water resources in water source areas with rapid urbanization.