论文部分内容阅读
采用GIS技术和地统计学相结合的方法对河北沧州果品主产区献县、泊头、沧县3个县表层土壤(0～20 cm)砷的空间分异特征进行了分析。结果表明:3个县表层土壤砷的平均值为12.46 mg kg-1,砷污染存在的风险较低。土壤砷最优理论模型为指数模型,空间结构上具有中等程度空间相关性,说明其空间变异主要是由母质、地形、土壤类型等结构性因素引起的。各向异性分析表明地质背景、河流和飘尘可能影响着土壤砷的分布。Kriging插图结果直观的反映出研究区内土壤砷的空间变异特征。调查结果显示含砷污水的农田灌溉,含砷煤燃烧产生的大气降尘,含砷农药、化肥的使用等是影响土壤砷分布的人为因素。
Spatial heterogeneity of arsenic in topsoil (0 ~ 20 cm) in three counties of Xianxian, Botou and Cangxian, the main fruit producing area of Cangzhou, Hebei, was analyzed using GIS and geostatistics methods. The results showed that the average soil arsenic in the three counties was 12.46 mg kg-1, and the risk of arsenic pollution was low. Soil arsenic optimal theoretical model for the exponential model, the spatial structure of a moderate degree of spatial correlation, indicating that the spatial variability is mainly caused by the parent material, topography, soil types and other structural factors. Anisotropy analysis shows that the geological background, rivers and fly ash may affect the distribution of soil arsenic. The results of Kriging illustrations directly reflect the spatial variation characteristics of soil arsenic in the study area. The survey results showed that farmland irrigation with arsenic-contaminated water, atmospheric dust emission caused by arsenic-containing coal combustion, the use of arsenic-containing pesticides and chemical fertilizers were the human factors affecting the distribution of soil arsenic.