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| Influences of Single and Combined Pollution of Lead and Cadmium and Their Interactions with Calcium or Zinc on Growth and Accumulation of Lead and Cadmium of Leeks |
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| KeyWord:soils; lead and cadmium combined pollution; leek; growth; accumulation characteristics |
| Author Name | Affiliation | | SUN Jian-ling | School of Mathematics and Physics, China University of Geosciences, Beijing 100083, China
National Research Center for Geoanalysis, Beijing 100037, China | | LUO Li-qiang | School of Mathematics and Physics, China University of Geosciences, Beijing 100083, China
National Research Center for Geoanalysis, Beijing 100037, China |
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| Abstract: |
| Ecological effects of heavy metals are often dependent on the presence of other elements. A pot experiment was undertaken to understand the influences of different concentrations of heavy metals（Pb and Cd） and their combinations with Ca, or Zn in soil on growth and Pb and Cd concentrations in the roots and leaves of leeks. Concentrations of Pb or Cd in leeks were positively correlated with those in soils. Lead and Cd had synergism effects at their low concentrations. At high concentrations, however, Pb promoted Cd absorptions, but Cd inhibited Pb absorption. Zinc showed excellent antagonistic effects on Pb and Cd under severe pollution by reducing the bio-availability of Pb and Cd, and promoting the growth of leeks. Calcium increased Pb concentrations at low Pb and Cd combined soil, while it inhibited the absorption of Pb at high Pb and Cd combination. Calcium had a very weak inhibitory effect on Cd. Both Pb and Cd were mainly accumulated in roots of leeks. The ratios of Cd in roots to leaves were about 1.5, while those of Pb were 2.5~4.5, indicating easier translocation of Cd than Pb in leeks. |
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