Abstract:

To study the interactions between heavy metals and other elements in the soil-wheat system, we perform correlation analysis and discuss the relations between 40 sets of wheat seed and their root soil elements. The results show that: (1) Enrichment coefficients of Cd, Hg, Pb, As, Ni, Cu and Zn in the wheat seed are negatively correlated with the soil pH, CEC and clay contents, whereas positive correlation exists between pH and Cr enrichment coefficient; (2) Enrichment coefficients of heavy metals and other elements in the wheat seed are mostly positively correlated; (3) In the wheat seeds, the Pb and Cu contents are positively correlated with the soil As and Pb contents, respectively, while the Cu and Zn contents in the wheat seeds are positively correlated with the Cd and Pb contents in the soil, respectively. Except that the Cr content in the wheat seeds is markedly positively correlated with the Mg content in the soil, there is no major relation between other heavy metals in the wheat seeds and Ca and Mg in the soil. The contents of some heavy metals (such as Cd, Pb and As) in the wheat seeds are positively correlated to the contents of trace elements (such as Mn, Mo and F) in the soil, but most of them are not highly correlated; (4) Contents of most heavy metals (such as Cd, Hg, Pb and As) in the wheat seeds show significant positive correlation with the contents of Ca, Mg, Mn and Mo in the wheat seeds. The above results indicate synergistic or antagonistic effects among heavy metals and other elements in the soil-wheat system, yet the actual mechanism would require further investigation.

Key words: wheat seed, heavy metal element, correlation analysis, Anqiu