Spatial Distribution of Heavy Metals in Sediments of Tamarix chinensis Wetland on the South Bank of Bohai Bay

In order to understand the spatial distribution of heavy metals in coastal wetlands, Tamarix chinensis wetlands on the south bank of Bohai Bay were selected as the research object. The content of Cr, Mn, Ni, Zn and Cu in soil was determined by sampling method in April 2018. The spatial distribution characteristics of heavy metals and causes were studied. The results showed that except for Cr, Ni and Zn, the content of other heavy metals in this area did not exceed the background value of soil environment in Shandong Province. The study area was slightly polluted by these three heavy metals. In the vertical direction, the content of Cr, Mn, Cu and Ni followed the law of surface layer>middle layer>bottom layer, while the content of Zn was higher in the bottom layer, which needed to be further studied. In the horizontal direction, the content of the five heavy metals was not significantly different according to the distance from the coastline. There was no significant difference in the content of heavy metals between rhizosphere soil and non-rhizosphere soil. There was a significant correlation between the content of heavy metal elements, except Mn, the content of heavy metals was significantly correlated with the content of soil organic matter. The content of some heavy metals was significantly correlated with the content of available phosphorus and ammonium nitrogen.