摘要
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 variability of arsenic in the surface layer soil（0-20 cm） from major fruit production area in Xianxian,Botou and Cangxian is studied by using GIS technique and geostatistical analysis.The results show that the average content of soil arsenic is 12.46 mg kg-1 and the pollution risk of soil arsenic is low.The semivariogram of soil arsenic is well fitted by an exponential model.It is found that spatial heterogeneity of soil arsenic is moderate,because the spatial variability is primarily controlled by structural factors of parent material,relief and soil types.Anisotropic analysis indicates that the special distribution of soil arsenic is affected by geological background,stream and suspending particulate.The spatial variability of soil arsenic in the study area can be reflected clearly by the map of the Kriging interpolation.According to the results of the investigation,irrigation with sewage,atmospheric dust arising from burning of coal and use of pesticide and fertilizer are the main human factors of the arsenic distribution.
出处
《土壤通报》
CAS
CSCD
北大核心
2011年第6期1496-1501,共6页
Chinese Journal of Soil Science
基金
国土资源部及农业厅河北省农业地质调查项目(200040007-3-5)资助
