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| Effects of Heavy Metal Contamination on Nematode Communities in Paddy Soils of an E-waste Recycling Area |
| Received:January 14, 2015 |
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| KeyWord:heavy metals;nematode;e-waste;diversity index;paddy field |
| Author Name | Affiliation | E-mail | | WANG Ying-li | School of Chemistry and Environment, Jiaying University, Meizhou 514015, China
College of Resources and Environment, South China Agricultural University, Guangzhou 510642, China | | | WANG Hong-hong | College of Resources and Environment, South China Agricultural University, Guangzhou 510642, China | | | LIAO Jin-ling | College of Resources and Environment, South China Agricultural University, Guangzhou 510642, China | | | XIE Qi-lai | College of Resources and Environment, South China Agricultural University, Guangzhou 510642, China | xieql@scau.edu.cn |
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| Abstract: |
| In order to investigate the influence of heavy metal contamination on nematode community structure in paddy-field polluted by electronic waste(e-waste), soil samples were collected from eight typical rice fields in e-waste recycling area of Guiyu Guangdong Province. The contents of heavy metals(Cd, Cu, Pb, Zn) were determined by ICP-MS, and nematodes were separated by elutriation-sifting-sugar solution centrifugation method and then identified. The results showed that 75% paddy-field samples were contaminated by Cd, Cu, Pb, Zn, and significant positive correlations(P<0.05) were observed among Cu, Pb, Zn. Nematodes belonged to six orders, 19 families and 26 genera. The plant parasitic nematodes were dominant, and Hirschmanniella, Helicotylenchus were common dominant genera. With increasing Cu in soil, ratio of plant parasitic nematodes to total nematodes dropped significantly. There was negative correlation between Pb concentrations and the plant-parasites maturation index(P<0.05). Compared with the unpolluted fields, amount of nematodes in paddy fields with low-grade pollution increased slightly, whereas that in the other fields dropped significantly with the increase of pollution grades. The nematode types of c-p2(r-strategists) and c-p3(k-strategists) were dominant in soils contaminated by heavy metals from e-wastes. With the increase of pollution levels, the proportion of c-p2 increased, but c-p3 groups showed an opposite trend. These results indicate that the number of nematodes and its function structure respond to heavy metal contaminations, and could be served as an important indicator to evaluate the heavy metal contaminations in e-waste recycling areas. |
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