Study On Purifying Effect Of Polluted Water By Aquatic Maerophytes In Longci Spring

At present, water pollution has become an important factor inthe global water shortage, deteriorated water quality has threatenhuman life, there is an urgent need to take effective measures topurify the pollution, which eutrophication and heavy metal pollutionare the challenges facing for the repair of the water environment.Due to the many natural and man-made causes,over the last decadea number of key rivers and reservoir water in Linfen also werepolluted, therefore, it is very urgent for management of waterpollution. Currently, at home and abroad large attention has beenpaid to the application for the bioremediation of eutrophic andheavy metals water, so in this topic, based on the type investigationof the macrophytes in Longci Spring, use several aquatic plants asthe experimental materials, by the method of artificial waterdistribution, research the effects of the restoration for theeutrophic water. At the same time, by analysis of chlorophyllcontent, antioxidant system and other physiological indicators ofthe aquatic plant, compared their stress resistance in the heavymetal chromium pollution water, and has a clear understanding forthe toxicity mechanism of aquatic plants.The aim to do this res -earch is just to provide a basis for selecting the plant to thewater purification in Linfen area, the results are as follows:1.Investigation result indicated that the aquatic macrophytes inLongci Spring of Linfen basin41species of aquatic macrophytes,bel-onging to25families37genus were found.Among them, Juncuseffuses, Mentha haplocalyx, Nasturtium officinale, Potamogetomcrispus, Chara inconnexa, Amethystea caerulea, Artemisia grayiLevl, Erigeron acer, Chenopodium glancum were common species.2.It could be seen from the results that the aquatic maerophytesselected in this test decrease the concentration of totalnitrogen(TN), total phosphorus(TP), ammonia nitrogen (NH4+-H)andchemical oxygen demand(COD).The hydrophytes including Juncuseffuses Linn, Nasturtium officinale R.Br., Potamogetom crispus Linnand Chara inconnexa.In low degree eutrophicated water, N.officinale R.Br. had the best effect, after incubation of20days, theremoval rates of TN, TP, NH4+-H and COD were75.28%,93.00%,76.35%and83.74%, respectively. The other three plants had abetter purifying effect as well. While in high degree eutrophicatedwater, J. effuses Linn had the best effect, after incubation of20days, the removal rates of TN, TP, NH4+-H and COD were89.30%,83.11%,83.41%and78.56%, respectively. But N. officinale R.Br.and C. inconnexa don't have a better purifying effect. The results ofpreliminary experiment showed that purifying eutrophic waterbodywith aquatic maerophytes is viable and effective.3.Nasturtium Officinale R.Br.,which were investigated inexperiment,showed that with the increasing of Cr⁶⁺,(1)the contentsof chlorophyll(Ch1), chlorophylla(Chla), chlorophyllb(Chlb), chlorophylla/b(Chla/Chlb) were increasing firstly and thendecreasing; for chlorophyll fluorescence, Fm, Fv/Fm and Fv/Fodecreased gradually while Fo increased firstly and then decreased;(2) Malondialdehyde (MDA) for roots and leaves gradually increased,and soluble protein for roots gradually increased, but for leaves, itincreased firstly and then decreased;(3) Uperoxide dismutase(SOD)and peroxidase(POD) have the same trend, they increased firstlyand then decreased, but for catalase (CAT) it decreased gradually.Under the different considers which studied above, it is easy toreach the conclusion that the detriment of the plant was resultedfrom destruction of biochemical metabolism. And the toxic effecton roots was more severe than that on leaves under the equalconcentration of Cr⁶⁺.4.Chara inconnexa,which were investigated in experiment,show-ed that with the increasing of Cr⁶⁺,(1)the contents ofchlorophyll(Ch1), chlorophyll a(Chla), chlorophyll b(Chlb),chlorophylla/b(Chla/Chlb) were increasing firstly and thendecreasing;(2) Malondialdehyde (MDA) gradually increased, andsoluble protein increased firstly and then decreased;(3)Uperoxidedismutase(SOD), peroxidase(POD) and catalase (CAT) have thesame trend, they increased firstly and then decreased. Under thedifferent considers which studied above, it is easy to reach theconclusion that the detriment of Chara inconnexa was resulted fromdestruction of biochemical metabolism.5.Potamogetom crispus Linn,which were investigated inexperiment,showed that with the increasing of Cr⁶⁺,(1)the contentsof chlorophyll(Ch1), chlorophyll a(Chla), chlorophyll b(Chlb) were increasing firstly and then decreasing, and chlorophylla/b(Chla/Chlb)gradually decreased.(2)Malondialdehyde (MDA) gradually increased,and soluble protein increased firstly and then decreased;(3)Uperox-ide dismutase(SOD) gradually decreased,peroxidase(POD) andcatalase (CAT) have the same trend, they increased firstly andthen decreased. Under the different considers which studied above,it is easy to reach the conclusion that the detriment of Potamogeto-m crispus Linn was resulted from destruction of biochemicalmetabolism.