Pedosphere 17(6): 739--746, 2007
ISSN 1002-0160/CN 32-1315/P
©2007 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Phosphorus in interstitial water induced by redox potential in sediment of Dianchi Lake, China |
LI Qing-Man1 , ZHANG Wen1,3, WANG Xing-Xiang2, ZHOU Yi-Yong1, YANG Hao2 and JI Guo-Liang2 |
1 Institute of hydrobiology, Chinese Academy of Sciences, Wuhan 430072 (China). E-mail: qmli@ihb.ac.cn;
2 Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008 (China);
3 Graduate School of the Chinese Academy of Sciences, Beijing 100049 (China) |
| ABSTRACT |
| The sediment redox potential was raised in the laboratory to estimate reduction of internal available phosphorus loads, such as soluble reactive phosphorus (SRP) and total phosphorus (TP), as well as the main elements of sediment extracts in Dianchi Lake. Several strongly reducing substances in sediments, which mainly originated from anaerobic decomposition of primary producer residues, were responsible for the lower redox potential. In a range of -400 to 200 mV raising the redox potential of sediments decreased TP and SRP in interstitial water. Redox potentials exceeding 320 mV caused increases in TP, whereas SRP maintained a relatively constant minimum level. The concentrations of Al, Fe, Ca2+, Mg2+, K+, Na+ and S in interstitial water were also related to the redox potential of sediments, suggesting that the mechanism for redox potential to regulate the concentration of phosphorus in interstitial water was complex. |
| Key Words: Dianchi Lake, interstitial water, phosphorus, redox potential, sediment |
| Citation: Li, Q. M., Zhang, W., Wang, X. X., Zhou, Y. Y., Yang, H. and Ji, G. L. 2007. Phosphorus in interstitial water induced by redox potential in sediment of Dianchi Lake, China. Pedosphere. 17(6): 739-746. |
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