Influence of <Emphasis Type="Italic">Potamogeton crispus</Emphasis> growth on nutrients in the sediment and water of Lake Tangxunhu |
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| Authors: | W J Mi D W Zhu Y Y Zhou H D Zhou T W Yang D P Hamilton |
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| Institution: | (1) Laboratory of Plant Nutrition and Ecological Environment Research, College of Resources and Environment, Huazhong Agricultural University, Wuhan, 430070, China;(2) Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, 430072, China;(3) Department of Water Environment, China Institute of Water Resources and Hydropower Research, Beijing, 100038, China;(4) Centre for Biodiversity and Ecology Research, University of Waikato, Private Bag 3105, Hamilton, 3240, New Zealand |
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| Abstract: | An incubation experiment was performed on Potamogeton crispus (P. crispus) using sediment collected from Lake Tangxunhu in the center of China, in order to determine the effects of plant growth on
Fe, Si, Cu, Zn, Mn, Mg, P, and Ca concentrations in the sediments and overlying waters. After 3 months of incubation, Ca,
Mg, and Si concentrations in the water column were significantly lower, and P and Cu concentrations were significantly higher
than in unplanted controls. The effect of P. crispus growth on sediment pore waters and water-extractable elements varied. Concentrations of Ca, Mg, Si, Fe, Cu, and Zn were significantly
higher, and P was significantly lower, than in pore waters of the control. Water-extracted concentrations of Fe, Mg, and Si
in the sediments were lower, and P was higher, than in the control. Presence of P. crispus generally enhanced concentration gradients of elements between pore waters and overlying waters but not for P. The growth
of P. crispus was associated with an increase in water pH and formation of root plaques, resulting in complex effects on the sediment nutritional
status.
Handling editor: S. M. Thomaz |
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| Keywords: | Submerged macrophyte Water column Pore waters Micro-nutrients Phosphorus |
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