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Effect of disturbance on the movement of exogenous phosphorus in simulative aquatic eco-systems. SHI Xiao-li1,
WANG Feng-ping2, JIANG Li-juan1, YANG Liu-yan1, KONG Zhi-ming1, GAO Guang3, QIN Bo-qiang3 (1.State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210093, China 2.The Modern Analysis Center, Nanjing University, Nanjing 210093, China 3.Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China). China Environmental Science. 2002,22(6) Abstract
Effect of different disturbance strength on the movement of exogenous phosphorus in water, Microcystis aeruginosa and base mud was studied simulatively with the method of isotope tracer. The exogenous phosphorus entered initially into M. aeruginosa and base mud in a mode of physical chemistry distribution. Then, the movement of exogenous phosphorus in water was significantly influenced by the growth of M. aeruginosa. The test result showed that the growth of M. aeruginosa was the best at the disturbance strength of 30 r/min, while the strength had nothing to do with the maximum content of phosphorus per mg M. aeruginosa, but could increase the velocity of phosphorus adsorption by M. aeruginosa. The content of dissoluble exogenous phosphorus in water declined with time. The decline and withering of M. aeruginosa could promote the movement of exogenous phosphorus from water to the base mud with most of it moved finally. The concentration of dissoluble exogenous in water could be effectively decreased by increase of disturbance, and it decreased to 0.0180mg/L from 2.183mg/L at disturbance of 30r/min. Key words
Fig.1 Effect of disturbance on the growth of M. aeruginosa and the movement of exogenous phosphorus Table1 The equation of 32P radioactivity in water Fig.2 The movement of exogenous phosphorus in aquatic eco-systems under different disturbance strength [8] Dokulil M, Chen W, Cai Q. Anthropogenic impacts to large lakes in China: the Tai Hu example [J]. Aquatic Ecosystem Health and [9] Steinberg C E W, Hartmann H M. Planktonic bloom- forming Cyanobacteria and the eutrophication of lakes and rivers [J]. [10] Fujimoto N, Sudo R. Nutrient- limited growth of Microcystis aeruginosa and Phormidium tenue and competition under various N:P supply ratios and temperatures [J]. Limnol. Oceanogr., 1997, [11] BERMAN T, Skyring G W. Phosphorus cycling in aquatic microorganisms studied by phased uptake of 33P and 32P [J]. [1] Hudson J J, Taylor W D, Schindler D W. Phosphate [12] Syers J K, Harris R F, Armstrong D E. Phosphate chemistry in concentr-ations in lakes [J]. Nature, 2000,406(6):54 56. lake sediments [J]. J. Environ. Qual., 1973,2:1 14. [2] Rigler F H. A tracer study of the phosphorus cycles in lake water [13] Gonsiorczyk T, Casper P, Koschel R. Variations of Phosphorus Release from Sediments in Stratified Lakes [J]. Water, Air and [3] Levine S N, Stainton M P, Schindler D W. A radiotracer study of phosphorus cycling in a eutrophic Canadian shield lake, Lake 227, Northwestern Ontario [J]. Can. J. Fish. Aquat. Sci., [4] Lean D R S, White E. Chemical and radiotracer measurements of phosphorus uptake by lake plankton [J]. Can. J. Fish. Aquat. Sci., [5] Halmann M, Stiller M. Turnover and uptake of dissolved phosphate in freshwater. A study in lake Kinneret [J]. Limnol.

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