[Effect of rhizospheric environment of VA-mycorrhizal plants on forms of Cu, Zn, Pb and Cd in polluted soil].
Maize (Zea mays L.) was inoculated with or without VA mycorrhizal (Glomus mosseae) and cultivated in a heavy metals contaminated soil. The distribution and dynamics of Cu, Zn, Pb and Cd forms in rhizosphere of maize inoculated with or without VA-mycorrhizal were analyzed with the technique of sequential extraction. Comparing with control soil, exchangeable Cu in rhizospheric soil increased significantly, and the exchangeable Cd trended down. In rhizosphere of VA-mycorrhizal maize, the amounts of Cu, Zn and Pb bound to organic matter were significantly higher than those in rhizosphere of non-mycorrhizal maize, while the four tested metals bound to carbonates and to iron and manganese oxides were constant in rhizosphere of mycorrhizal and non-mycorrhizal maize. These results illustrated that the plant roots could influence the distribution and dynamics of metal forms in rhizosphere, and much for mycorrhizal plants than for non-mycorrhizal plants. At excessive concentration of soil metals, mycorrhizal roots might decrease the bio-availability of toxic heavy metals by changing their forms. The factors that caused the change of metal fractions in rhizosphere of mycorrhizal and non-mycorrhizal plants were also discussed.
Huang
Y
Y
Department of Urban and Environmental Sciences, Peking University, Beijing 100871. yhuang@urban.pku.edu.cn
Chen
Y
Y
Tao
S
S
D002104:Cadmium / Q000378:metabolism; D003300:Copper / Q000378:metabolism; D017753:Ecosystem; D004777:Environment; D005658:Fungi / Q000254:growth & development*; D007854:Lead / Q000378:metabolism; D019216:Metals, Heavy / Q000378:metabolism*; D018517:Plant Roots / Q000254:growth & development* / Q000382:microbiology; D012989:Soil Pollutants / Q000378:metabolism*; D013559:Symbiosis; D003313:Zea mays / Q000254:growth & development / Q000382:microbiology; D015032:Zinc / Q000378:metabolism
D019216:Metals, Heavy; D012989:Soil Pollutants; D002104:Cadmium; D007854:Lead; D003300:Copper; D015032:Zinc