Abstract: Based on the data of 1∶50 000 land quality geological survey, the soil fluorine geochemical characteristics and ecological effects were studied, in Western Wanzhou District of Three Gorges Reservoir area. The results showed that the average fluorine content in surface soil in the study area was 578.4 mg/kg, slightly higher than the national average of surface soil. The spatial distribution pattern of fluorine was obviously controlled by strata, and there was a significant positive correlation between the fluorine content of soil and rock samples in the horizontal section. The fluorine content of soil and parent rock had good inheritance. The soil fluorine geochemical evaluation showed that the local soil fluorine in the study area was excessive, mainly distributed in the Triassic strata. The investigation of the fluorine ecological effect showed that the fluorine content in surface water was high, without exceeding the national standard, and the fluorine in agricultural products in some areas exceeded the standard, to which great attention and intensive study should be paid.

Key words: fluorine, geochemical characteristics, ecological effects, Wanzhou District, Chongqing City