Pedosphere 9(2): 139--146, 1999
ISSN 1002-0160/CN 32-1315/P
©1999 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Effect of organic materials on speciation of copper in soil solution |
| WANG Guo, CHEN Jian-Bin, GU Xun-Gang, GAO Shan and CAI Hai-Yang |
| Department of Land and Environmental Science, Fujian Agricultural University, Fuzhou 350002 (China) |
| ABSTRACT |
| Incubation of two soils, a red soil derived from granodiorte and a fluvo-aquic soil from alluvial deposit, with rice straw, Chinese milk vetch and pig manure under submerged condition were conducted to study the species of Cu in soil solutions as affected by the organic materials. The organic materials increased total soluble Cu by raising dissolved organic carbon (DOC) in soil solution when the solution pH values were below the range in which Cu deposited quickly. When the solution pH rose to this range, the increase of DOC did not raise total soluble Cu. Total soluble Cu in all the treatments dropped with incubation time. After adding organic materials labile Cu dropped with incubation time and decreased sharply in the pH range of Cu precipitation. Addition of organic materials enhanced slowly labile Cu but depressed the ratio of labile Cu to total soluble Cu. Slowly labile Cu decreased with incubation time. Stepwise multiple linear regression analysis showed that total soluble Cu was positively correlated with Eh and DOC (P = 0.0025), labile Cu was negatively correlated with pH (P = 0.0118), and slowly labile Cu was positively correlated with Eh and DOC (P = 0.0022). Both the labile and slowly labile Cu were correlated with total soluble Cu at extremely significant levels. |
| Key Words: coppert dissolved organic carbon, organic material, speciation |
| Citation: Wang, G., Chen, J. B., Gu, X. G., Gao, S. and Cai, H. Y. 1999. Effect of organic materials on speciation of copper in soil solution. Pedosphere. 9(2): 139-146. |
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