Study on the purification dynamics and mechanism of different aquatic plants on eutrophic water
To study the purification kinetics and the mechanism of eutrophic water bodies by different aquatic plants,four aquatic plants,namely Jussiaea stipulacea,Vallisneria natans,Eichhornia crassipes and Cyperus papyrus,were used as experimental materials and cultured in natural eutrophic water solution for 40 days.During the period,the changes of plant biomass,nutrient elements in water solution,and physiological indicators of the plants were studied.The results showed that the growth rate of aquatic plants affected their purification power.Different types of aquatic plants have different absorption and removal effects on nitrogen and phosphorus in water.Aquatic plants with high growth rates had strong ability to purify water bodies.For example,E.crassipes and J.stipulacea had strong high growth rate which resulted in high removal rates of ammonia nitrogen(NH+4-N)with maximum on the 8th day,reaching 87%and 92%,respectively.However,V.natans grew relatively slowly which resulted in low removal rate of NH+4-N,reaching its maximum of 75%on the 20th day;In addition,the activities of peroxidase(POD)and nitrate reductase(NRA)in aquatic plants could also affect their removal kinetics and effectiveness of nitrogen and phosphorus in water.This study can provide scientific basis for controlling eutrophication in water bodies.
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