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Impact of heavy metal combined pollution on soybean growth and its integrated assessment

Yu Guoying; Wu Yanyu and Wang Xin (Laboratory of Ecological Process of Trace Substances in Terrestrial Eecsystem, Institute of Applied Ecology, Academia Sinica,Shenyang 110015)  
The impact of Cd,Pb,Cu, Zn and As combined pollution on soybean growth is studied with Hogland solution culture. The results show that under condition of combined pollution, the accumulation of heavy metals in root is in the order of AsPbCuCdZn and that in stem and leaf is in the order of CdCuZnAsPb. The type of their interaction is depended on the added concentration of elements and the proportion of coexistent ones. As and Cu are the main elements toxic to the growth of soybean. Relative ionic intensity is an effective index for indicating and controlling the integrated effect of combined pollution.
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