Journal of Zhejiang University SCIENCE
(ISSN 1009-3095, Monthly)
2003   Vol. 4   No. 3   p.358-362

Effects of pH and Eh on release of nitrogen and phosphorus from sediments of West Lake

HU Qin-hai(胡勤海)(College of Environment and Resources, Zhejiang University, Hangzhou 310029, China)
ZHU Yin-mei(朱荫湄)(College of Environment and Resources, Zhejiang University, Hangzhou 310029, China)
SONG Jing(宋静)(College of Environment and Resources, Zhejiang University, Hangzhou 310029, China)
LI Zhen-yu(李震宇)(College of Environment and Resources, Zhejiang University, Hangzhou 310029, China)
WEN Jun-jie(温军杰)(College of Environment and Resources, Zhejiang University, Hangzhou 310029, China)

Abstract:The effects of pH and Eh on release of nitrogen and phosphorus from sediments of West Lake under different conditions were investigated by simulation test. Results showed that the net flux of NH4+-N release from sediments increased with pH, but NO3--N showed negative-going release at all tested pH levels. The net flux of NH4+-N release from sediments was higher under anaerobic or aerobic condition of the overlying water, but only under aerobic condition would net release of NO3--N occur. It was also shown that phosphorus released was mainly in its inorganic form, higher pH and anaerobic conditions of overlying water greatly stimulated release of phosphorus. In situ measurement at several West Lake locations indicated that sediment resuspension induced by boat propeller stimulated nutrients release from sediment into overlying water.
Keywords:West Lake, Sediments, Nitrogen, Phosphorus

CLC Number:XI524 Document ID:A

Foundation Item:Project (No.294059) supported by National Natural Science Foundation of Zhejiang Province, China
Author Resume:HU Qin-hai,E-mail:qhhu@zju.edu.cn

References:

[1]Chemistry Commission of Soil Science Society of China(CCSSSC),1993. The Methods of Soil Analysis. Science Press, Beijing(in Chinese).
[2]Eckert, W., Nishri, A. and Parparova,R., 1997. Factors regulating the flux of phosphate at the sediment-water interface of a subtropical calcareous lake: A simulation study with intact sediment cores. Wat. Air. Soil Pollut, (99):401-409.
[3]Fan, C.X., 1995. The physical and chemical features of Lake Ge sediments and release stimulation of phosphorus. J. Lake Science,7(4):341-349(in Chinese).
[4]Li, Z.Y. and Zhu, Y.M., 1999. Characteristics of organic substance in West Lake sediments. Report of the Suwa Hydrobiological Station, (11):79-82.
[5]Moore, Jr., Reddy, K.R. and Fisher, M.M., 1998. Phosphorus flux between sediment and overlying water in Lake Okeechobee, Florida. J. Environ.Qual., (27):1428-1439.
[6]Pei, H.P., Wang, W.W. and He, J.G., 1998. The model of phosphorus cycling in eco-system after drawing water to West Lake of Hangzhou. J. Ecology, 9(6):648-653(in Chinese).
[7]Tang, M.C., Zhu, Y.M. and Jia, Z.S., 1999. Study on influential factors of phosphorus release form West Lake sediments. Report of the Suwa Hydrobiological Station, Publishel by Faculty of Science,(11): 83-86.
[8]VanLuijn, F., Boers, P.C.M., Lijklema, L. and Sweerts, J.P.R.A, 1999. Nitrogen fluxes and processes in sandy and muddy sediments from a shallow eutrophic lake. Wat. Res., 33(1):33-42.
[9]Wang, X.R., Hua, Z.Z. and Xu, L., 1996. Effects of environmental conditions on phosphorus release from sediments of Tai Lake. Environ. Chem., 15(1):15-19(in Chinese).

Manuscript Received:2002年7月2日

Manuscript Revised:2002年10月8日

Published:2003年6月1日