Study On The Distribution Of Mineral Elements In Aquatic Plants

The concentrations of N,P,Al,B,Ba,Ca,Cr,Co,Cd,Cu,Fe,Be,Mg,Mo,Ni,Pb,S,T1,Zn,and As in the sampled aquatic plants were detected.The aquatic plants including Acorus calamus Linn,Hydrocotyle vulgaris,Nymphoides peltatum(Gmel.)O.Kuntze,Pycreus sanguinolentus(Vahl)Nees,Typha orientalis Presl,Canna indica Linn,Eichhornia crassipes(Mart.)solms,Phragmites australis(Cav.)Trin.ex Steud,and Myriophyllum verticillatum were collected from five water bodies with different aquatic ecosystem in Hangzhou,China.The difference of the concentration of each element in the nine aquatic plants was investigated.The distribution characteristics of each element among roots and stem with leaves in two of the sampled plants was studied.The relationship of the concentration of each element in plant between its concentration in water and sediment was also calculated.The main results were as following.(1)The concentration of N and P in the harvestal parts of plants was ranked as:Myriophyllum verticillatum>Pycreus sanguinolentus(Vahl)Nees)>Hydrocotyle vulgaris>Nymphoides peltatum(Gmel.)O.Kuntze>Eichhornia crassipes(Mart.)solms>Acorus calamus Linn>Typha orientalis Pres>Canna indica Linn>Phragmites australis(Cav.)Trin.ex Steud,which indicated emerged plant>floating plant and floating-leaved plant>emerging plant.The concentration of N and P in Myriophyllum verticillatum was 1034.34 mg/kg,and it was 7 times as that in Phragmites australis(Cav.)Trin.ex Steud.(2)The total concentration of the first priority pollutants such as As,Cd,Cr,Cu,Pb Ni,TI,and Be in the harvestal parts of plants was ranked as:Eichhornia crassipes(Mart.)solms>Pycreus sanguinolentus(Vahl)Nees>Typha orientalis Presl>Myriophyllum verticillatum>Hydrocotyle vulgaris>Nymphoides peltatum(Gmel.)O.Kuntze>Phragmites australis(Cav.)Trin.ex Steud>Acorus calamus Linn>Canna indica Linn The concentration of those elements in Eichhornia crassipes(Mart.)solms was 110.67 mg/kg,it was 3.7 times as that in Canna indica Linn.(3)The total concentration of all the detected elements in the harvestal parts of plants was ranked as:Eichhornia crassipes(Mart.)solms>Pycreus sanguinolentus(Vahl)Nees>Myriophyllum verticillatum>Hydrocotyle vulgaris>Nymphoides peltatum(Gmel.)O.Kuntze>Acorus calamus Linn>Canna indica Linn>Typha orientalis Presl>Phragmites australis(Cav.)Trin.ex Steud.The concentration of those elements in Eichhornia crassipes(Mart.)solms was 33.14 mg/kg,it was 3.7 times as that in Phragmites australis(Cav.)Trin.ex Steud.(4)The concentration of the main nutrient elements such as N,P,and Ca in the roots was higher than that in the stem&leaves in Eichhornia crassipes(Mart.)solms and Acorus calamus Linn,and it was lower in roots than that in the stem&leaves.The translocation factor most of the first priority pollutants such as As,Cd,Cr,Cu,Pb Ni,T1,and Be was less than 0.3.(5)The relationship of concentrations of the detected elements between the pants and corresponding water or sediment was not significantly found for Hydrocotyle vulgaris and Acorus calamus Linn.