Research Progress on Reconstruction of Lake Palaeo-Salinity

湖泊是陆地生态系统的节点，湖泊盐度是反应湖泊生态系统变化的重要参数，因此重建湖泊古盐度对于研究古生态、反演湖泊演化历史非常重要。目前应用广泛的重建湖泊古盐度方法主要有介形类壳体的地球化学元素比值法，硼元素法，沉积磷酸盐法，部分研究显示一些生物指标也可以用来定量的分析古盐度。虽然我们认为古沉积环境是一个封闭的系统，但仍不可避免地会与周围各个环境因子发生作用，促使古环境信息的提取更为困难，为了使重建的古盐度更加接近于当时发生时的状态，应尽可能的采用多指标方法，以便得到一个更接近于真实环境的值。 Lake is the node of terrestrial ecosystems, and its salinity is an important parameter to reflect the change of lake ecosystem, so it is very important to reconstruct the palaeo-salinity and reveal the evolution of the lake. Currently, the method which is widely used to reconstruct lake paleo-salinity is geochemical characteristics of chemical elements from ostracode shells, boron element method and sedimentary phosphate method; some studies have shown that some biological indicators can also be used to quantitatively analyze paleo-salinity. Although we believe that the palaeo sedimen- tary environment is a closed system, it is still inevitable that it interacted with various environ-mental factors around, which make it hard to obtain information of paleo environment. In order to reconstruct the palaeo-salinity more correctly, we use multi-index method to get a closer to the value of the real environment.