双台河口土壤中Mn、Zn和Rb的变化规律及其原因分析

选取辽宁盘锦双台河口滩涂翅碱蓬生长消亡区的20个土壤样本点，比较其与翅碱蓬生长繁茂区的11种微量元素含量，并对其变化量进行主成分分析，得出双台河口滩涂土壤中含量变化显著的微量元素为Mn、Zn和Rb。通过这3种微量元素含量变化曲线图，可以看出其含量变化趋势大体上是减少的，且距离拦海大坝越近，含量越高，距离拦海大坝越远，含量越低。研究区河口底泥中Mn、Zn和Rb的含量分别占研究区滩涂土壤中的47.6%、64.3%和78.5%，表明了研究区滩涂土壤中3种元素主要是由河口地区的沉积物带来的。河口地区水中的沉积物主要由两部分组成:一部分是由河水携带的泥沙颗粒直接在河口地区沉积形成；另一部分是由河水携带的大量胶体，在入海口处产生胶凝作用形成。

Study on the Variable Rule and Reason of Mn, Zn and Rb in the Soil of Shuangtai River Outfall

The principal component analysis (PCA) model is applied to analyze the variation law of the contents of 11 trace elements in 20 soil samples collected in the Shuangtai River outfall in Liaoning Province. It is proved that Mn, Zn and Rb are the main elements which varied to the most extent. From the diagram of the content variation of Mn, Zn and Rb, it can be found that the contents of the three trace elements decrease with the distance to the blocking sea water dam and the closer the mudflat soil to the dam, the higher the content of Mn, Zn and Rb it contains. In the study area, the contents of Mn, Zn and Rb in the outfall take up 47.6%, 64.3% and 78.5% of the mudflat soil samples respectively, which indicates that the sediments in river water origined from two sources: the mud and sand in the river deposit in outfall and the colloid in the river gel through gelation in the estuary.