长江全流域性的Cd异常是近期发现的重大生态环境问题。对土壤镉异常源追踪与定量评估的方法技术进行系统研究、查明污染源，任务十分紧迫。攀枝花地区具备独特的自然、人工交互环境，是对这一科学问题进行深入研究的理想场所。研究具有新颖性。本项目拟从土壤镉的地球化学行为研究入手，通过微量元素地球化学研究，查明典型矿区土壤镉空间变异规律，确定镉的自然背景输入；通过非传统稳定同位素示踪，研究Cd异常带的形成原因、镉的物质来源及分布、输入输出通量及迁移规律；采用高精度同位素测试技术，通过同位素地球化学方法，对比研究矿区土壤及污染端元物质的Cd同位素组成特征，揭示大型矿业活动区土壤镉自然源和人为源的叠加情况，精细刻画镉在地表端元储存库中的自然循环规律。研究成果具有普遍适用性，可定量区分及评价人为活动释放污染物对土壤环境质量的相对贡献和影响，为区分环境污染源提供新的示踪手段，并有望拓展同位素体系的应用领域。

Cd anomaly in the Yangtze River basin was found recently to be a very important ecological environmental problem. It's a pressing task to chase and evaluate the pollution sources. Panzhihua is a ideal place to carry out this research with a special environment of natural and anthropogenic combination. So the research has a novelty. The project will start with the study of geochemical behavior of soil cadmium, through the method and theory of trace elements geochemistry, to reveal cadmium spatial variation and verify natural input of soil cadmium in the mining area. Using the method of non-traditional stable isotopic tracing, we aim to study the forming mechanism of Cd anomaly, sources, distribution, fluxes and transport. By the method of isotope geochemistry, high accuracy isotopic determination technology will be applied to compare Cd isotopic ratios between soil samples and end members, to reveal the overlying of natural and anthropogenic cadmium under the background of large-scale mining activities, and then to describe cadmium cycling in soil. The results will be useful to distinguish and evaluate quantitatively anthropogenic cadmium inputs to soil, and provide a new tracing method for pollution sources. More importantly, the results will extend the application of isotopic system.