3种水生植物腐解过程中磷营养物质迁移,转化过程研究

The decomposition processes of submerged plant Myriophyllum verticillatum L, floating plant Trapa bispinosa Roxb and emerged plant Lotus flower were simulated in the laboratory at initial biomass density of 5.7 g•L^-1, and the migration and conversion rules of phosphorus in the process were studied. The results showed that the variation pattern of decreasing, ascending and descending appeared after the decomposition rate increased to the maximum at 2 d(1.075,1.455,1.16 g•d^-1 respectively), and there were significant difference in the whole process of decomposition(p<0.01), while the average phosphorus release rate were 0.456, 0.670, 0.537 mg•g^-1 respectively in the whole decay period respectively for Myriophyllum verticillatum L, Trapa bispinosa Roxb, Lotus flower, and most of all the matter released were inorganic phosphate; The phosphorus released in the water were migrated and converted to the sediment obviously under the action of sediment adsorption and its own sedimentation, and the concentration of phosphorus in the water decreased, and finally turned to the initial level (0.5 mg•L^-1) at the end of the test. This study can provide scientific reference for recovering or rebuilding the aquatic vegetation system in lake.