Pedosphere 22(2): 254--262, 2012
ISSN 1002-0160/CN 32-1315/P
©2012 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Phytoavailability of copper, zinc and cadmium in sewage sludge-amended calcareous soils |
LI Qiong1,2, GUO Xue-Yan2, XU Xing-Hua2, ZUO Yu-Bao2, WEI Dong-Pu2 and MA Yi-Bing2 |
1 The Key Lab of Resource Environment and GIS, the College of Resource Environment and Tourism, Capital Normal University, Beijing 100048 (China)
2 Ministry of Agriculture Key Laboratory of Plant Nutrition and Nutrient Cycling, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081 (China) |
| ABSTRACT |
| The toxicity of trace elements (TEs), such as copper (Cu), zinc (Zn), and cadmium (Cd), often restrict land application of sewage sludge (SS) and there was little information about soil-plant transfer of TEs in SS from field experiments in China. In this study pot and field experiments were carried out for 2 years to investigate the phytoavailability of TEs in calcareous soils amended with SS. The results of the pot experiment showed that the phytoavailability of Zn and Cu in the SS was equal to 53.4%-80.9% and 54.8%-91.1% of corresponding water-soluble metal salts, respectively. The results from the field experiment showed that the contents of total Zn, Cu, and Cd in the soils increased linearly with SS application rates. With increasing SS application rates, the contents of Zn and Cu in the wheat grains initially increased and then reached a plateau, while there was no significant change of Cd content in the maize grains. The bioconcentration factors of the metals in the grains of wheat and maize were found to be in the order of Zn > Cu > Cd, but for the straw the order was Cd > Cu > Zn. It was also found that wheat grains could accumulate more metals compared with maize grains. The results will be helpful in developing the critical loads of sewage sludge applied to calcareous soils. |
| Key Words: bioconcentration factor, biosolids, metal transfer, trace elements |
| Citation: Li, Q., Guo, X. Y., Xu, X. H., Zuo, Y. B., Wei, D. P. and Ma, Y. B. 2012. Phytoavailability of copper, zinc and cadmium in sewage sludge-amended calcareous soils. Pedosphere. 22(2): 254-262. |
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