Pedosphere 8(4): 297--304, 1998
ISSN 1002-0160/CN 32-1315/P
©1998 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Phosphate adsorption and surface charge characteristics and their relations to mineralogy of some soils from Southern China |
| ZHANG Ming-Kui1, M. J. WILSON2, HE Zhen-Li1, L. CLARK2 and D. M. L. DUTHIE2 |
1 Department of Soil Science and Agricultural Chemistry, Zhejiang Agricultural University, Hanyzhou 310029 (China)
2 Soils and Soil Microbiology Division, Macaulay Land Use Research Institute, Aberdeen, AB9 2QJ (UK) |
| ABSTRACT |
| The phosphate adsorption and surface charge characteristics of the tropical and subtropical soils derived from different parent materials in China were determined, and their relations to soil mineralogy were analysed. The results showed that all soil phosphate adsorption curves were well fitted by Freundlich equation and Langmuir equation. The maximum buffering capacity of P ranged from 66 to 9 880 mg kg-1, with an increasing order of purple soil, skeletal soil, red soil, lateritic red soil, yellow soil and latosol; and the highest value was 149 times the lowest value, which indicated great differences among these soils in phosphate adsorption and supplying characteristics. The pH0 (zero point of charge) values obtained by salt titration-potential titration varied from 3.03 to 5.49, and the highest value was found in the latosol derived from basalt whereas the lowest value was found in the purple soil. The correlation analysis indicated that the main minerals responsible for phosphate adsorption in the soils were gibbsite, amorphous iron oxide and kaolinite; and the pH0 was mainly controlled by kaolinite, gibbsite and oxides. |
| Key Words: mineralogy, pH0, phosphate adsorption, tropical and subtropical soils |
| Citation: Zhang, M. K., Wilson, M. J., He, Z. L., Clark, L. and Duthie, M. L. 1998. Phosphate adsorption and surface charge characteristics and their relations to mineralogy of some soils from Southern China. Pedosphere. 8(4): 297-304. |
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