意外湖花介是我国干旱、半干旱地区湖泊、河流等水域广泛分布的重要介形类属种，其壳体微量元素（主要是Mg、Sr）是定量重建古环境的重要指标。然而，目前有关其壳体的微量元素分配系数的影响因素及现代变化过程研究十分薄弱，这大大地限制了利用其壳体微量元素定量重建古环境的应用。本申请选取巴丹吉林沙漠南部分布密集、水化学差异大的湖泊区为研究区域，以生长于这些湖泊中的介形类优势属种-意外湖花介为研究对象，通过分析不同水体环境下意外湖花介的壳体微量元素组成特征和湖泊水化学、温度等环境参数，确定不同水体环境下意外湖花介壳体微量元素分配系数的主要影响因素，建立分配系数与主要影响因素之间的定量、半定量关系。本申请的研究成果将为我国干旱、半干旱地区利用介形类壳体微量元素定量重建古环境过程中分配系数的确定提供重要的理论依据。

Limnocythere inopinata is widely distribute in arid and semi-arid regions , China. Trace elements (mainly refer to Mg, Sr) incorporated in the shell of L. inopinata (mainly refer to Mg, Sr) was commonly used as an important proxy for the quantitative reconstruction of paleoenvrironment. Whereas, the modern process of the trace element partition coefficient of L. inopinata is not clear. Evenly, which impact factors control the partition coefficient in the different aquatic environment is still uncertain. The above questions seriously hinder the use of trace element in the shell of L. inopinata for quantitative reconstruction of paleenvironment. In this application project, the southern area of Badain Jaran Desert is selected as study area. In this area, many lakes are densely distribute and the water chemistry are largely different. We plan to survey the trace element composition of L. inopinata and lake water chemistry as well as temperature, dissolved oxygen, and so on. Then, the main impact factors of the partition coefficient in different aquatic environment are estimated using the principal component analysis and canonical correspondence analysis. At last, the quantitative and semi-quantitative relationship between the partition coefficient and the main control impact factors will be established. This research results will provide important theory guidance for the determination of partition coefficient in the process of quantitative paleoenvironment reconstruction in arid and semi-arid area, China.