An experiment was conducted to study the spatial variation characteristics of arsenic contents in surface and deep soil as well as their influencing factors. Samples from surface and deep soil were collected in the northern Songnen plain. The spatial variation characteristics of soil arsenic were quantified based on geostatistic, and the horizontal spatial distribution of arsenic content in surface and deep soil were simulated using the Kriging interpolation in ArcCIS. Results show that arsenic contents in surface and deep soil are lower than the background value of soil arsenic in China, and the study area belongs to a clean and healthy area with low content of soil arsenic. The spatial variation of arsenic in deep soil is relatively more intensive than that of arsenic in deep soil. The spatial patterns of arsenic contents in surface and deep soil exhibit that the soil arsenic content is higher in high-lying Songnen plain and lower in low-lying Songnen plain. Natural factors play a dominant role in the spatial pattern of arsenic contents in surface and deep soil, and human interferences exert an effect, to some extent, on the migration of arsenic in surface soil.%以我国粮食生产基地松嫩平原的北部为研究区域,分别采集表层土壤(0～20 cm)和深层土壤(1 m)样本,利用地统计学对土壤砷的空间分异特征进行量化,并结合ArcGIS软件的克里金插值方法分别对表层土壤和深层土壤进行土壤砷质量分数的水平空间分布格局模拟,分析了表层土壤砷和深层土壤砷的水平空间分异特征及其影响因素.研究表明:表层和深层土壤中砷元素质量分数均低于我国土壤砷元素质量分数背景值,属于砷元素质量分数较低、较为清洁健康的区域；深层土壤砷的水平空间格局强度相对较大,表层土壤砷的水平空间格局强度相对较小；表层土壤和深层土壤中砷元素的空间格局均为松嫩高平原土壤砷质量分数较高,松嫩低平原土壤砷质量分数较低；自然因素对深层土壤砷和表层土壤砷的水平空间格局起着主导作用,人为干扰对表层土壤砷的迁移行为造成一定程度的影响.
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