Pedosphere 18(1): 69--76, 2008
ISSN 1002-0160/CN 32-1315/P
©2008 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Leaching of copper and zinc in a garden soil receiving poultry and livestock manures from intensive farming |
HAO Xiu-Zhen 1,2, ZHOU Dong-Mei1, CHEN Huai-Man1 and DONG Yuan-Hua1 |
1 State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008 (China). E-mail: xzhao@issas.ac.cn;
2 Graduate School of the Chinese Academy of Sciences, Beijing 100049 (China) |
| ABSTRACT |
| The leaching characteristics of a garden soil may be greatly affected by application of poultry and livestock manures from intensive farming. Packed soil columns of a garden soil (CK) and the soils after respectively receiving 2% pig manure (PM), chicken manure (CM), and commercial organic manure (OM) were leached with 0.05 mol L-1 Ca(NO3)2 and 0.01 mol L-1 EDTA solutions. The leachate EC (electric conductivity) values gradually increased at the beginning and then reached a stable value when the soil columns were leached with 0.05 mol L-1 Ca(NO3)2 solution. The leachate EC values showed a peak-shape when leached with 0.01 mol L-1 EDTA solution. In all the soil columns, the pH values of the leachates decreased with increase of displacement volumes when the Ca(NO3)2 solution was used. The total amounts of Cu and Zn eluted from the four soil columns were significantly correlated with the extracted soil Cu and Zn concentrations by 1.0 mol L-1 NH4NO3, but were not correlated with the leachate dissolved organic carbon (DOC) contents. The Zn concentration in the leachate of the PM-treated soil column with 0.05 mol L-1 Ca(NO3)2 solution was above the Quality Standard Ⅲ for Ground Water of China (GB/T 14848-93, Zn < 1.0 mg L-1). When compared with 0.05 mol L-1 Ca(NO3)2, the EDTA solution significantly accelerated Cu and Zn elutions in the manure-treated columns. This suggested that applying poultry and livestock manures from intensive farming to farmland might pose a threat to the groundwater quality. |
| Key Words: copper, garden soil, leaching, manures, zinc |
| Citation: Hao, X. Z., Zhou, D. M., Chen, H. M. and Dong, Y. H. 2008. Leaching of copper and zinc in a garden soil receiving poultry and livestock manures from intensive farming. Pedosphere. 18(1): 69-76. |
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