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《Acta Ecologica Sinica》 1983-03
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UPTAKE RATE OF HEAVY METALS BY PLANTWITH RESPECT TO THEIR CONTENT AND FORMIN SOIL IN THE EAST SUBURBS BEIJING

XiA ZENGLU MU CONGRU LI SENZHAO MENG WEIQI SHEN RUIZHENHE RUIZHEN(Institute of Geography. Academia Sinica)  
The uptake rate of Hg and As of rice is greater than that of wheat. But the uptake rate of Cu, Pb, Zn and Cd of rice is lower than that of wheat, and their order is: Zn CdCuAsHgCrPb.The sequence of some heavy metals contained in various organs of rice and wheat is as follows: rootsstems leavesgrains. The amount in vegetables also varies with different kinds of vegetable. Pb is obstructed in roots, and is difficult to be transported into stems, leaves and grains. It is easy for Cd to be absorbed into roots, but it is difficult to be tranported into stems and leaves. It is easy for Zn and Cu to enter roots, stems and leaves.The uptake of heavy metals in various organs of wheat, rice and vegetables decreases with content of heavy metals increasing in soil.Under the simulated pot-culture, there is a positive correlation between extractable content and total content of heavy metals in soil, but there is no correlation between them in the field.Under the field condition, the amount of Pb and Cd extracted with NH4OAC in soil are approximate to that in plant. The amount of Cu extracted with DTPA is more approximate to that in plant, and the amount of Zn extracted with various extractants is very low.The uptake rate in plant is affectedby by various valence forms of element. The uptake rate of Cd and Cr in rice was as following order: CdCl2CdSO4CdOCdCO3 CdS: Cr (Ⅵ)Cr (Ⅲ).Order of heavy metals content to wheat and rice in different regions is as follows: Hunan, ChengduShenyangBijingLanzhou.
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