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《Acta Agriculturae Nucleatae Sinica》 1993-02
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STUDY ON TRANSFER OF CADMIUM IN SOIL-PLANT SYSTEMS WITH THE ISOTOPIC DILUTION METHOD

Wu Qitang(Department of Soil Science,South China Agricultural University,Guangzhou,510642)J. L. Morel A. Guckert(Phytotechnie-INRA,ENSAIA,54505 Nancy,France)  
Experiments were conducted to determine the transfer rate from endogenous and exogenous cadmium in soil to plants.Soils were labelled with 109Cd and amended with soluble cadmium salt or Cd containing sewage sludge.Ryegrass (Lolium perenne L.) were grown in pots and the effective transfer of cadmium from different sources to shoot of the plant were measured.The soils were also extracted with 0.1 M CaCl2 DTPA and 0.1N HC1.The results showed that the addition of soluble cadmium salt substantially increassed the plant cadmium content.Plant absorbed mainly the cadmium from exogenous sources in the soils treated with cadmium.The effective transfer rate of exogenous cadmium was higher than that of endogenous ones,and the soluble salt form was 2 to 3 times higher than that in the sewage sludge.0.1 M CaCl2 extracted Cd was significantly correlated with the plant cadmium content.The specific radioactivity of cadmium extracted by this reagent was nearer to the plant cadmium than that extracted by others.0.1 N HCl extracted cadmium could not be absorbed by plants.
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