典型产业承接区土壤砷含量的空间分布特征及影响因素

本文以揭阳市为研究区域,采集了1330个表层土壤(0—20 cm)样品和331个深层土壤(150—200 cm)样品,利用富集因子法分析了表层土壤中As的污染状况,通过GIS空间分析技术以及单因素分析法探究了土壤As的空间分布特征以及影响因素.结果表明,研究区表层土壤As含量的均值为6.03 mg·kg^-1,低于该区土壤背景值(7.16 mg·kg^-1)及农用地土壤污染风险管控值(20 mg·kg^-1),大部分土壤为轻微污染和中度污染.揭阳市表层土壤As含量高值区分布于揭阳市东北部、中部和西南部地区,低值区分布于西北部和东南部地区.土壤类型、成土母质和土地利用类型是影响表层土壤As含量的重要因素,在不同土壤类型中,黄壤和赤红壤As含量相对较高;不同成土母质中,粉砂岩母质土壤As含量显著高于其他母质;在不同土地利用类型中,农用地土壤As含量最高.

Spatial distribution characteristics and influencing factors of soil arsenic content in typical industrial undertaking areas

Taking Jieyang City as the research area, this paper collected 1330 samples of surface soil(0—20 cm) and 331 samples of deep soil(150—200 cm), and analyzed the As pollution status in the surface soil by enrichment factor method. Through GIS spatial analysis technology and single factor analysis method, the spatial distribution characteristics and influencing factors of soil As were explored. The results showed that: The average As content in the surface soil of the study area was 6.03 mg·kg^{^(-1}), which was lower than the soil background value(7.16 mg·kg^{^(-1})) and the agricultural land soil pollution risk control value(20 mg·kg^{^(-1})). Most of the soil was slightly polluted and moderately polluted. The high As content are distributed in the northeast, middle, and southwest areas of Jieyang City, and the low As content are located in the northwest and southeast areas in the surface soil of Jieyang City. Soil type, soil parent material and land use type are important factors affecting the As content of topsoil. In different soil types, As content is relatively high in yellow soil and lateritic red soil;Among different soil parent materials, the As content of siltstone parent soil is significantly higher than other parent materials;Under different land use methods, the As content of agricultural soil is the highest.