| The alluvial plain in the lower reaches of the Yellow River where the study area is located is one of the main high- fluoride areas in soil and groundwater in China, and geofluorosis has caused certain harm to the health of local people. To study the enrichment regularity of fluorine in the shallow soil along the Yellow River in southwestern Shandong Province, the surface and lower vertical soil controlled- samples were collected for geochemical index testing and analysis. The results of soil particle size and geochemical indexes in the study area were analyzed by statistical principles, and the spatial distribution characteristics and enrichment law of fluorine in the soil along the Yellow River in southwestern Shandong Province were analyzed from the perspective of the correlation between soil texture, chemical indexes, mineral weathering degree and fluorine content. The results showed that the average content of fluorine in the surface soil of the study area was 594 mg/kg, which was higher than the average level of North China Plain and Shandong, and about 80% of the surface soil had excess fluorine content. The average mass fraction of silt, clay and sand in shallow soil is 72.99%, 20.31% and 6.70% respectively. In the study area, the fluorine element is easy to accumulate in the low and flat terrain on the plane, and in the vertical soil surface. The source of fluorine in soil is from Loess Plateau, and its content is controlled by the clay content in soil, which has a significant positive correlation with fluorine. Soil fluorine content was positively correlated with Ca, Al, Fe, Mg, K, Ti, Mn, N, S, V, Zn, Cr content and CEC, and negatively correlated with Si, Na content and pH value. The concentration of fluorine element in soil increased with the increase of chemical weathering degree of soil particles. |