The release of phosphorus from sediment into water in subtropical wetlands: a warming microcosm experiment
Article first published online: 25 APR 2011
Copyright © 2011 John Wiley & Sons, Ltd.
Volume 26, Issue 1, pages 15–26, 1 January 2012
How to Cite
ZhiJian, Z., ZhaoDe, W., Holden, J., XinHua, X., Hang, W., JingHua, R. and Xin, X. (2012), The release of phosphorus from sediment into water in subtropical wetlands: a warming microcosm experiment. Hydrol. Process., 26: 15–26. doi: 10.1002/hyp.8105
- Issue published online: 27 DEC 2011
- Article first published online: 25 APR 2011
- Accepted manuscript online: 29 MAR 2011 05:32AM EST
- Manuscript Accepted: 16 MAR 2011
- Manuscript Received: 10 JAN 2011
- phospholipid fatty acids;
Global warming poses a great threat to wetland ecological stability and water quality improvement. In this paper, we sampled six types of wetlands representing different kinds of land utilisation around the TaiHu Lake Basin in southeast China. An outdoor computerized microcosm was set up in May 2008 to simulate climate scenarios of ambient temperature (control) and a warmed ambient temperature (+5 °C) using a novel minute-scale daily and seasonal temperature manipulation technology. The 18-month incubation indicated that warming impaired the ecological sink of sediment (fixing P from porewater) while strengthening the role of the ecological source, moreover, the rate of P release from sediment into porewater (19–113% for total phosphorus) was much stronger than from top sediment into overlying water. Warming enhanced the activity of neutral and alkaline phosphatases for P-deficient wetland sediments and neutral phosphatases for P-rich sediments, at the 14th month of incubation. A significant increase in total phospholipid fatty acids (PLFAs) occurred under warming in sediments with relatively low levels of PLFAs, but bacterial abundance in the sediment biomass tended to decrease (18%) along with an increase (4·5%) of the fungi-to-bacteria ratio. The variations of carbon consumption and availability indicated by measured dissolved organic carbon in sediment may have contributed to P release from sediments to water. Copyright © 2011 John Wiley & Sons, Ltd.