Abstract:

By ICP plasma method, heavy metal on soil and different organs of corn plants by Fe-Mn nodules were analyzed in Litang karst area, as well enrichment coefficient and correlation with heavy metal of soil. The study showed that: (1) content of As, Cd, Cr in soil had produced pollution; (2) content of As, Cd, Cr was lower, while content of Cu, Pb, Zn, Mn was higher in different organs of corn; total enrichment of heavy metal was highest in leaf, while that were lower in stem and seed; heavy metal were the highest in different organs of corn plants, Cd, Cr in roots, Pb in stem, As, Cu, Zn, Mn in leaf, while were the lowest as follows, Zn, Mn in stem, As, Cd, Cr, Cu, Pb in seed; average enrichment coefficient of heavy metal was generally low in corn plants, its value was less than 1.000. (3) Mn, Cr of roots were significant positive correlation with the same elements in the soil, as well Mn in stem, while Cd, Pb in stem were significant negative correlation with the same elements in the soil, as well Pb in leaf, heavy metal of corn seeds were no significant positive correlation with the same elements in the soil and correlation were lower. Analysis of heavy metals provided direction to local farming, growing corn was priority choice.