Pedosphere 10(2): 171--176, 2000
ISSN 1002-0160/CN 32-1315/P
©2000 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Effect of lanthanum accumulation on cation exchange capacity and solution composition of red soil |
| XIE Zu-Bin, ZHU Jian-Guo, CHU Hai-Yan, CAO Zhi-Hong and DENG Xi-Hai |
| Institute of Soil Science, the Chinese Academy of Sciences, P.O. Box 821, Naviing 210008 (China) |
| ABSTRACT |
| Pot and adsorption-exchange experiments were carried out by collecting the soil samples from the surface layer (0~15 cm) of red soil at the Ecological Experiment Station of Red Soil, the Chinese Academy of Sciences, in Jiangxi Province of China. When concentration of the exogenous La3+ exceeded 400 mg kg-1, there was less non-exchangeable La3+ than exchangeable La3+ in the soil. Cation exchange capacity of the soil changed slightly with increasing concentration of the exogenous La3+ in both experiments. However, in the adsorption-exchange experiment, when concentration of the exogenous La3+ was higher than 300 mg kg-1, exchangeable basic cations decreased significantly, while exchangeable hydrogen and exchangeable aluminum increased significantly compared with the control treatments. The amounts of base cations (Ca2+, Mg2+, K+ and Na+) exchanged by La3+ in the supernatant solution increased with the concentration of the exogenous La3+, especially when concentration of the exogenous La3+ was higher than 50 mg kg-1. |
| Key Words: CEC, exchangeable acidity, lanthanum, red soil, solution composition |
| Citation: Xie, Z. B., Zhu, J. G., Chu, H. Y., Cao, Z. H. and Deng, X. H. 2000. Effect of lanthanum accumulation on cation exchange capacity and solution composition of red soil. Pedosphere. 10(2): 171-176. |
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