Research On Plants Absorbing Heavy Metals Of Wetland

Through investigation to Cd, Zn, Pb, Cu in wetland near the oil mine at Shuangtaizi estuarine in Panjin city, LiaoNing I disCussed these rule of mental deposit moving in soil and phragmites communis sea system.By the research, It is easy to found out that different mental has the different ability of absorbing, the relation of the four kinds of heavy metals in the soil, sea and root and stem of phragmites communis was Zn>Cu>Pb>Cd. A certain kind of heavy mental distribution variously in different medium. The general distribute feature of Cd,Zn,Pb in the system of soil phragmites communis and sea is soil>sea>root>stem. the value of Cu is soil>root >sea>stem. The dense of Heavy mental in phragmites communis root>stem. The enrichment coefficients of each mental in soil in phragmites communis is Zn>Cd>Cu>Pb, different mental has the different ability of moving in soil-root and root-stem. Cd has the most strong ability of moving from soil to root and Pb has tile weakest ability of that, Zn has the strongest ability of that from root to stem and the other three mental have the similar ability.It is found out that the absorb ability to heavy mental of phragmites communis variously from different state of mental through the research of the relation of mental density of different state and the first two forms (the exchangeable and the carbonates ) are extractable by plant in soil, but the others are obviously not.In this dissertation, I assessment the single polluted index and complex pollution index method of polluted soil. It found out that the soil of this area has not been polluted seriously. The pollution mainly made from Cd and the pollution index between 2 and 3,that is general pollution. Cu and Pb is slight pollution, Zn in the soil isn't pollution but it isn't of the safety value and need clear.