关键词: 潮滩沉积物, 重金属, 空间分布与累积, 横沙岛

Abstract: For a long period, the industrial and city sewage were over-discharged along the Yangtze River, which would no doubt have harmful effect in estuary environment either directly or indirectly. So it is very necessary to study tidal flat environment of Hengsha, and to qualitatively assess the environment. Based on heavy metal analysis in intertidal sediment samples in Hengsha, spatial distribution and accumulation of heavy metals were concluded. Up to now, the tidal environment of Hengsha is relatively clean, but there is still severe pollution trend at some places, owning to the city sewage discharge, and the wet and dry depositions of automobile tail gas and industrial dust. The concentration of Cu, Zn, Cr, Pb were the highest among heavy metals and even reached 2.34, 4.24, 2.74, 1.63 times to sediment background. Through correlation analysis on sediment granularity and organic component with heavy metals, factors which control the heavy metals include effect of water dynamic action and activating effects of tidal flat livings.

Key words: intertidal sediments, heavy metals, spatial distribution and accumulation, Hengsha Island