Pedosphere 4(2): 97--103, 1994
ISSN 1002-0160/CN 32-1315/P
©1994 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Effects of Soil pH, Texture, Moisture, Organic Matter and Cadmium Content on Cadmium Diffusion Coefficient |
| WU QI-TANG1, J. L. MOREL1, A. GUCKERT1 |
| Department of Soil and Environmental Sciences, South China Agricultural University, Guangzhou 510642 (China))(ENSAIA, INRA, Lab. d’Agronomic et Environment, 54505 Nancy (France) |
| ABSTRACT |
| The supply of cadmium from soil to plant roots mainly depends on the difFusion process. This work was conducted to study the effects of some soil properties on cadmium diffusion coefficient (D) in soil. Measurements were made using the Shofield and Graham-Bryce's isotopic labelling method. Cadmium diffusion coeffiaents varied from 10-7 to 10-9 cm2S-1.Higher values were observed in acid sandy soik and lower values in calcareous clay soils. Liming an acid soil resulted ina substantial decrease of D. Addition of cadmium as nitrate salt generally increased D, while addition of sewage sludge and organic matter resulted in a significant decrease of cadmium ditFusion. The rhizospheric activity also indrrxd a moderate reduction in D. The relationships between D (10-9cm2S-1) on the one hand and soil pH, moisture (Mc, g kg-1), organic matter (OM, g kg-1), clay (Cy, g kg-1) and cadmium content (Cd, mg kg-1) on the other were obtained by the multiple regression:D=182.1-29.91pH+0.210Mc-03030M+0.011 Cy+1.64Cd (R2=0.859, n=22). |
| Key Words: |
| Citation: Wu, Q. T., Morel, J. L. and Guckert, A. 1994. Effects of Soil pH, Texture, Moisture, Organic Matter and Cadmium Content on Cadmium Diffusion Coefficient. Pedosphere. 4(2): 97-103. |
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