MONITORING OF HEAVY METALS IN MACROPHYTES AND ASSESSMENT OF LACUSTRINE ENVIRONMENTAL QUALITY OF TAIHU LAKE
Dai Quanyu (Nanjing Institute of Geography, Academia Sinica)
Taihu Lake is one of the five famous big fresh-water lakes in China with an area of 2460km2 and a depth of about 2-3m. In order to assess the lacustrine environmental quality of Taihu Lake heavy metals in macrophytes were investigated in the year between 1980-1981. The monitoring data and in turn assessment of the lacustrine environmental quality of Taihu Lake were studied and came to following conclusions: 1) The heavy metals in macrophytes in polluted area are found to be higher than in non-polluted area. 2) The heavy metals in macrophytes at the mouth of the river are higher than in other lacustrine places. 3) The higher the heavy metals in natural lacustrine soils, the higher are the heavy metals in macrophytes in this same area. It is shown that macrophytes possess the capability of indicating heavy metal elements in the Lake. Taihu Lake so far has been found of good water quality, with only 1% of it polluted by heavy metals.