| According to the State Environmental Protection Administration of China"on the National Survey of soil pollution of the notice"(UNCED [2006] No. 116), the Environmental Monitoring Central Station of Hubei started a comprehensive investigation on situation of soil pollution of Hubei in 2007. Based on the item, in this paper, soil fluoride in Hubei Province is as the research object, through sampled in field, analysised tests in laboratory, used statistical analysis software (SPSS), geographic information system software (ArcGIS) and Geostatistics method (Kriging interpolation) to processing and analysis the data of fluoride. GS~+ for fitting the data of fluoride, ArcGIS for spatial analysis of fluoride, grid and kriging interpolation method were used for the present pollution situation distribution of fluoride in soil respectively. Single factor index method was used for water soluble fluoride of soil to evaluate soil and classification. The main results were showed as follow:1. The soil fluoride pollution distribution in the space situation of Hubei are displayed by the intuitionistic maps made by the grid method and Kriging. For the region performance that of the soil total fluorine is higher in the eastern and southern parts, and lower in the western and northern parts in Hubei province, where Enshi, Yichang, Shiyan, Shennongjia forest areas are the highest concentration areas; for water soluble fluorine of soil, high-content areas are mainly distributed in Shiyan , Yichang, Wuhan and Huangshi City.2. The contents of soil total fluorine in Hubei are between 106.00～4344.73mg/kg, and the average is 665.44mg/kg; The content of water soluble fluorine between 0.02～72.60mg/kg, and the average is 3.20mg/kg, the coefficient of variation is large, this indicates there may be some point pollution source.3. Compared among the land use types, the sequence of soil total fluorine content is woodland> upland field> paddy field> grassland; while the water soluble fluorine of soil is upland field> paddy field> woodland> grassland. Compared among the soil types, the sequence of soil total fluorine content is brown soil> dark brown soil> yellow soil> calcareous soil> yellow-brown soil> purple soil> aquic soil> paddy soil> red soil> meadow soil> yellow cinnamon soil; while the water soluble fluorine of soil is brown soil> dark brown soil> purple soil> calcareous soil> yellow cinnamon soil> yellow soil> yellow-brown soil> paddy soil> red soil> aquic soil> meadow soil.4. The data of total fluoride with a high spatial correlation, was highly impacted by the parent material, topography, soil types and other natural factors. In addition the soil parent materials, soil pH are the main factors to impact soil total fluoride. The content of soil total fluoride was related with CEC, OM, pH and clay significantly, but insignificant with silt and sand. Spatial variability caused by random factors such as fertilization, management level had a large impact on water soluble fluorine of soil. The content of water soluble fluoride of soil was very significant positive correlation with the content of sand and clay, and was significantly negatively correlated with CEC and silt, but had no significant correlation with OM and pH. There was no significant correlation betweensoil total fluorine and water soluble fluorine.5. To evaluation of water soluble fluoride, single-factor pollution index showed that Shiyan Hubei, Yichang, Wuhan, Huangshi, etc. had got a slight pollution; while Zhuxi, Zhushan in Shiyany, Dangyang, Wujiagang, Zhijiang in Yichang, Jiangxia in Wuhan, Daye, Yangxin in Huangshi had reached a moderate degree of pollution; the rest areas of Hubei Province had no pollution with fluoride.It will be a guiding significance to find out the fluoride content of surface soil in Hubei Province and forecast endemic fluorosis and set soil fluoride content standards by this study. |
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