《Table 1 The descriptive statistics of Cu, Zn in the surface sediments》

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《Spatial Distribution Characteristics of Heavy Metals Cu and Zn in Coastal Wetland Sediments》

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The de-scriptive statistical analysis results of Cu and Zn in the surface sediments of coastal wetland in the Yellow River Delta are shown in Table 1.As can be seen from Table 1，the Cu，Zn content range of surface sediments was 16.70-50.40 mg/kg and 18.15-48.80 mg/kg，respectively，and the average content was 31.12mg/kg and 36.74 mg/kg，respectively.The background values of two metal elements（Cu，Zn）in the surface soil were 13.46mg/kg and 42.31 mg/kg，respectively in Shandong Province.The average content of Cu in the sediments of coastal wetland in the Yellow River Delta was significantly higher than the background value of heavy metal element Cu content in soil，and the average content of Cu was 2.3 times the background value，while the average content of Zn was lower than the background value.It indicated that the Zn content in the wetland surface sediments was at a normal level，while the surface soil of the Yellow River Delta wetlands was heavily polluted by heavy metal Cu.The coefficient of variation（CV）of Cu was 22%，and the coefficient of variation（CV）of Zn was 24%.The coefficients of variation of the content of two elements showed little difference，indicating that the content distribution of Cu and Zn was consistent in the surface layer.Cu had a skewness of 0.18 greater than 0，and the sampling point data were located on the right side of the average，indicating that the Cu content of most sampling points was higher than the average value；the skewness of Zn was less than 0，indicating that the Zn content of most sampling points was lower than the average.