Synergistic Effects of Different Sediment Conditioners and Modified Medical Stone on the Growth of Vallisneria natans
From the perspective of regulating the eutrophic sediment environment and restoring the submerged plant ecology,the present study systematically explores efficient composite sediment modifiers aimed at restoring submerged plants in urban shallow lakes.The experiment selects four commonly used sediment modifiers in water environment management,including calcium oxide,calcium peroxide,calcium nitrate,and potassium monopersulfate.These modifiers,combined with magnesium-loaded modified maifanite,are used for the composite improvement treatment of polluted sediments.Simultaneously,the growth effects of different sediment modifiers and modified maifanite combinations on Vallisneria natans are comprehensive-ly evaluated based on the planting and growth effects of the submerged plant.The results indicate that calcium oxide exhibits the best fixation effect on total phosphorus in the overlying water body and ammonia nitrogen in the sediment during the com-posite treatment process with magnesium-modified maifanite.However,the treated water environment has a certain inhibitory effect on the growth of Vallisneria natans.The risk of eutrophication is higher in the water body treated with calcium nitrate,resulting in poor growth of Vallisneria natans.Plant growth is better after the sediment improvement with calcium peroxide and potassium monopersulfate.Specifically,the calcium peroxide experimental group shows the highest net weight gain multiple for the submerged plant.Additionally,calcium peroxide is more effective than potassium monopersulfate in control-ling the content of significant environmental factors(ammonia nitrogen,total phosphorus,and total organic carbon in sedi-ment)in an eutrophic state within a suitable range for the growth of Vallisneria natans.Therefore,the composite sediment improvement measure of calcium peroxide and magnesium-modified maifanite is more suitable for sediment improvement in the early stage of ecological restoration of submerged plants during water environment management compared to other sediment modifier combinations.
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