Title: Effect of phosphorus concentration on growth of Myriophyllum spicatum and Hydrilla Verticillata
Abstract: The effect of different phosphorus nutrition conditions(0.02、0.1、0.2、0.4、0.8 mg·L-1)on the growth of the macrophytes Myriophyllum spicatum and Hydrilla Verticillata was investigated.The growth of Hydrilla Verticillata was promoted when the concentration of phosphorus was 0.2 mg·L-1.Branch,height,and root-length all notably increased and were maximized under these conditions.But for Myriophyllum spicatum,the optimal concentration of phosphorus was 0.4 mg·L-1.At 0.2 mg·L-1phosphorus,the height and root-length of Hydrilla Verticillata was greater than that of Myriophyllum spicatum,while at 0.4 mg·L-1 phosphorus the reverse was true.The results demonstrate that Myriophyllum spicatum could tolerate higher phosphorus concentrations than Hydrilla Verticillata.However,the optimal phosphorus concentrations for the growth of both Myriophyllum spicatum and Hydrilla Verticillata exceed the phosphorus concentrations in eutrophic water bodies.So thephosphorus concentration alone cannot directly cause the degradation of submersed macrophytes in eutrophic water bodies.
Publication Year: 2009
Publication Date: 2009-01-01
Language: en
Type: article
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