BIOGEOCHEMICAL CHARACTERISTICS OF METAL ELEMENTS IN WATER-PLANT SYSTEM OF LAKE DIANCHI

The content of K, Na, Ca, Mg, Fe, Mn, Zn, Cu, Pb and Cd were analysed in the dominant hydrophyte Eichhornia crassipes (Mart.) Solm, Alternanthear philoxeroides Griseb., Potamogeton pectinatus L., Myriophyllum spicatum L., Zizania caduciflora(Tucz.) H.-M and in water samples in Lake Dianchi. Lake Dainchi is a biogeochemical zone with higher contents of K, Ca, Mg, Fe. The accumulation of metal elements in plant may be affected by the environmental factors. The absorption of elements might not be correlated with the cormsponding nutrient elements but might directly with contaminants. Furthermore, the composition of the chemical elements of water-hydrophyte system in Lake Dianchi is significantly correlated.